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  • 1. Andersson, Ken G.
    et al.
    Rosestedt, Maria
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Farmaceutiska fakulteten, Institutionen för läkemedelskemi, Plattformen för preklinisk PET.
    Varasteh, Zohreh
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Farmaceutiska fakulteten, Institutionen för läkemedelskemi, Plattformen för preklinisk PET.
    Malm, Magdalena
    Sandström, Mattias
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för radiologi, onkologi och strålningsvetenskap, Enheten för nuklearmedicin och PET.
    Tolmachev, Vladimir
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för immunologi, genetik och patologi, Medicinsk strålningsvetenskap.
    Lofblom, John
    Stahl, Stefan
    Orlova, Anna
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Farmaceutiska fakulteten, Institutionen för läkemedelskemi, Plattformen för preklinisk PET. Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för immunologi, genetik och patologi, Medicinsk strålningsvetenskap.
    Comparative evaluation of 111In-labeled NOTA‑conjugated affibody molecules for visualization of HER3 expression in malignant tumors2015Inngår i: Oncology Reports, ISSN 1021-335X, E-ISSN 1791-2431, Vol. 34, nr 2, s. 1042-1048Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Expression of human epidermal growth factor receptor type 3 (HER3) in malignant tumors has been associated with resistance to a variety of anticancer therapies. Several anti-HER3 monoclonal antibodies are currently under pre-clinical and clinical development aiming to overcome HER3-mediated resistance. Radionuclide molecular imaging of HER3 expression may improve treatment by allowing the selection of suitable patients for HER3-targeted therapy. Affibody molecules are a class of small (7 kDa) high-affinity targeting proteins with appreciable potential as molecular imaging probes. In a recent study, we selected affibody molecules with affinity to HER3 at a low picomolar range. The aim of the present study was to develop an anti-HER3 affibody molecule suitable for labeling with radiometals. The HEHEHE-Z08698-NOTA and HEHEHE-Z08699-NOTA HER3-specific affibody molecules were labeled with indium-111 (In-111) and assessed in vitro and in vivo for imaging properties using single photon emission computed tomography (SPECT). Labeling of HEHEHE-Z08698-NOTA and HEHEHE-Z08699-NOTA with In-111 provided stable conjugates. In vitro cell tests demonstrated specific binding of the two conjugates to HER3-expressing BT-474 breast carcinoma cells. In mice bearing BT-474 xenografts, the tumor uptake of the two conjugates was receptor-specific. Direct in vivo comparison of In-111-HEHEHE-Z08698-NOTA and In-111-HEHEHE-Z08699-NOTA demonstrated that the two conjugates provided equal radioactivity uptake in tumors, although the tumor-to-blood ratio was improved for In-111-HEHEHE-Z08698-NOTA [12 +/- 3 vs. 8 +/- 1,4 h post injection (p.i)] due to more efficient blood clearance. In-111-HEHEHE-Z08698-NOTA is a promising candidate for imaging of HER3-expression in malignant tumors using SPECT. Results of the present study indicate that this conjugate could be used for patient stratification for anti-HER3 therapy.

  • 2. Argyropoulos, C.
    et al.
    Chatziioannou, A. A.
    Nikiforidis, G.
    Moustakas, Aristidis
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska och farmaceutiska vetenskapsområdet, centrumbildningar mm, Ludwiginstitutet för cancerforskning.
    Kollias, G.
    Aidinis, V.
    Operational criteria for selecting a cDNA microarray data normalization algorithm2006Inngår i: Oncology Reports, ISSN 1021-335X, E-ISSN 1791-2431, Vol. 15, nr 4, s. 983-996Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Microarray technology allows gene expression profiling at a global level. Many algorithms for the normalization of raw microarray data have been proposed, but no attempt has yet been made to propose operationally verifiable criteria for their comparative evaluation, which is necessary for the selection of the most appropriate method for a given dataset. This study develops a set of operational criteria for assessing the impact of various normalization algorithms in terms of accuracy (bias), precision (variance) and over-fitting (information reduction). The use of these criteria is illustrated by applying the three most widely used algorithms (global median normalization, spiked-in based normalization and lowess) on a specifically designed, multiply-controlled dataset.

  • 3. Babaei, Mohammad Hossein
    et al.
    Almqvist, Ylva
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi.
    Orlova, Anna
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi.
    Shafii, Mohammad
    Kairemo, Kalevi
    Tolmachev, Vladimir
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi.
    [99mTc] HYNIC-hEGF, a potential agent for imaging of EGF receptors in vivo: preparation and pre-clinical evaluation2005Inngår i: Oncology Reports, ISSN 1021-335X, E-ISSN 1791-2431, Vol. 13, nr 6, s. 1169-75Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Expression of epidermal growth factor receptors (EGFR) has prognostic and predictive value in many kinds of tumors. Imaging of expression of EGFR in vivo may give valuable diagnostic information. The epidermal growth factor (EGF), a natural ligand, is a possible candidate for the targeting of EGFR. The present study describes a method for preparation of (99m)Tc-EGF via the hydrazinopyridine-3-carboxylic acid (HYNIC) conjugation using tricine and ethylenediamine-N,N'-diacetic acid (EDDA) as co-ligands. Both conjugates bound EGFR expressing cells with nanomolar affinity, and demonstrated good intracellular retention. The complex with EDDA demonstrated much higher stability in blood serum and during cysteine challenge. Biodistribution of (99m)Tc-EDDA-HYNIC-EGF in normal mice demonstrated fast blood clearance of conjugate, and its ability to bind EGFR in vivo. (99m)Tc-EDDA-HYNIC-EGF is a promising candidate for visualization of EGFR expression in vivo.

  • 4.
    Berglund, Mattias
    et al.
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för radiologi, onkologi och strålningsvetenskap, Enheten för onkologi.
    Hedström, Gustaf
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för radiologi, onkologi och strålningsvetenskap, Enheten för onkologi.
    Amini, Rose-Marie
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för immunologi, genetik och patologi, Molekylär och morfologisk patologi.
    Enblad, Gunilla
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för radiologi, onkologi och strålningsvetenskap, Enheten för onkologi.
    Thunberg, Ulf
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för radiologi, onkologi och strålningsvetenskap, Enheten för onkologi.
    High expression of microRNA-200c predicts poor clinical outcome in diffuse large B-cell lymphoma2013Inngår i: Oncology Reports, ISSN 1021-335X, E-ISSN 1791-2431, Vol. 29, nr 2, s. 720-724Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Diffuse large B-cell lymphoma (DLBCL) is a heterogeneous group of B-cell lymphomas. A new and important tool for understanding the biology and clinical course of DLBCL is microRNA expression. This study presents microRNA-200c expression data from 61 DLBCL patients treated with CHOP or R-CHOP. Patients with high microRNA-200c expression had a median survival of 20.3 months and a significantly shorter overall survival (P=0.019) compared to patients with low microRNA-200c expression, who had a median survival of 35.8 months. We also found that patients treated with R-CHOP only and displaying high microRNA-200c expression had a significantly shorter overall survival compared to patients with low microRNA-200c expression, where all patients were still alive at the time of the last follow-up (P=0.0036). Lastly, we found that patients with high microRNA-200c expression had a significantly shorter time from initial diagnosis to the first relapse compared to patients with low microRNA-200c expression (P=0.0001). To our knowledge, this is the first study showing that the expression of microRNA-200c affects the clinical outcome of DLBCL patients, and that microRNA-200c is involved in the biology of DLBCL development, although larger studies are necessary to confirm this. Further investigations may also help to elucidate the biological role of microRNA-200c in DLBCL.

  • 5.
    Byström, P.
    et al.
    Department of Oncology and Pathology, Karolinska Institutet, Stockholm, .
    Berglund, Åke
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi.
    Nygren, Peter
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi.
    Wernroth, Mona-Lisa
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska och farmaceutiska vetenskapsområdet, centrumbildningar mm, Uppsala kliniska forskningscentrum (UCR).
    Johansson, Birgitta
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi.
    Larsson, Anders
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för medicinska vetenskaper.
    Einarsson, R.
    Glimelius, Bengt
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi.
    An explorative study on the clinical utility of baseline and serial serum tumour marker measurements in advanced upper gastrointestinal cancer2010Inngår i: Oncology Reports, ISSN 1021-335X, E-ISSN 1791-2431, Vol. 24, nr 6, s. 1645-1652Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The value of early tumour marker changes during palliative chemotherapy in patients with upper gastrointestinal adenocarcinoma (UGIA) is unclear. Seventy-three patients with advanced UGIA were randomised to receive 45 mg/m2 docetaxel or 180 mg/m2 irinotecan with 5-FU/leucovorin. After every 2nd course the patients were crossed over to the other regimen. Serum was sampled before start of chemotherapy and every 2nd week during 8 weeks for CEA, TPA, TPS, CA72-4, CA19-9 and CA242 measurements. Eighteen patients (25%) had partial response (PR) and 21 patients had stable disease for at least 4 months (SD4). All baseline marker levels, except CA72-4, correlated with time to progression and survival. Patients with normal levels, except CA72-4, also had more clinical responses (PR+SD4) than patients with elevated values. Tumour marker changes early during treatment provided modest predictive information for tumour response and survival. A model combining baseline level, the change and the interaction between them gave the best prediction of outcome, however, insignificantly better than baseline level for all markers except CA242. Baseline tumour marker levels provide prognostic information for patients with UGIA on palliative chemotherapy. Early changes generally failed to provide accurate information for tumour response and survival.

  • 6.
    Göstring, Lovisa
    et al.
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för immunologi, genetik och patologi, Medicinsk strålningsvetenskap.
    Lindegren, Sture
    Univ Gothenburg, Sahlgrenska Acad, Dept Radiat Phys, SE-41345 Gothenburg, Sweden.
    Gedda, Lars
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för immunologi, genetik och patologi, Medicinsk strålningsvetenskap. Swedish Radiat Safety Author, SE-17116 Stockholm, Sweden.
    17AAG-induced internalisation of HER2- specific Affibody molecules2016Inngår i: Oncology Reports, ISSN 1021-335X, E-ISSN 1791-2431, Vol. 12, nr 4, s. 2574-2580Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The geldanamycin derivative 17-allylamino-17-demethoxygeldanamycin (17-AAG) is known to induce internalisation and degradation of the otherwise internalisation-resistant human epidermal growth factor receptor 2 (HER2) receptor. In the present study, 17-AAG was used to increase internalisation of the HER2-specific Affibody molecule ABY-025. The cellular redistribution of halogen-labelled At-211-ABY-025 and radiometal-labelled In-111-ABY-025 following treatment with 17-AAG was studied. 17-AAG treatment of SKOV-3 human ovarian carcinoma and SKBR-3 human breast carcinoma cells to some extent shifted the localisation of In-111-ABY-025 from the cell surface to intracellular compartments in the two cell lines. ABY-025 labelled with the high-linear energy transfer emitter At-211 was also internalised to a higher degree; however, due to its physiological properties, this nuclide was excreted faster. The results indicate that 17-AAG may be used to facilitate cell-specific intracellular localisation of a suitable cytotoxic or radioactive agent coupled to ABY-025 in HER2-overexpressing cells.

  • 7.
    Höglund, Johanna
    et al.
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi, Enheten för radiologi.
    Orlova, Anna
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi, Enheten för biomedicinsk strålningsvetenskap.
    Sundin, Anders
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi, Enheten för radiologi.
    Lundqvist, Hans
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi, Enheten för biomedicinsk strålningsvetenskap.
    Tolmachev, Vladimir
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi, Enheten för biomedicinsk strålningsvetenskap.
    Cellular processing in the SW1222 cell line of mAb A33 directly and indirectly radiohalogenated2006Inngår i: Oncology Reports, ISSN 1021-335X, E-ISSN 1791-2431, Vol. 16, nr 1, s. 159-63Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Investigations into the cellular processing of radiolabeled monoclonal antibodies (mAbs) for their further use in radioimmunodiagnosis and cancer therapy are needed in order to understand the fate of internalized and catabolized mAbs. The anti-colorectal cancer mAb, A33, was labelled with 76Br and 125I using the direct Chloramine-T method, or by labelling N-succinimidyl para-(tri-methylstannyl) benzoate and its further conjugation to the mAb. The cellular processing of the four conjugates was investigated in SW1222 cells in vitro. Uptake of mAb was rapid, peaking after 14-16 h. Intracellular degradation was slow and the early loss of radioactivity was due to dissociation of cell-surface bound mAb. The indirect labelling resulted in stronger binding of the mAb as well as prolonged intracellular retention of the radiolabel. Direct and indirect halogen radiolabelling results in different cell-processing patterns of radiolabels, and radioactive catabolic products follow different routes of cellular excretion. The results of this cellular study indicate that indirect labelling is preferable to the direct Chloramine-T method.

  • 8.
    Lagerstedt-Robinson, Kristina
    et al.
    Karolinska Inst, Dept Mol Med & Surg, SE-17176 Stockholm, Sweden.;Karolinska Univ Hosp, Dept Clin Genet, L5 03, SE-17176 Stockholm, Sweden..
    Rohlin, Anna
    Sahlgrens Univ Hosp, Dept Clin Pathol & Genet, SE-41345 Gothenburg, Sweden.;Univ Gothenburg, Sahlgrenska Acad, Inst Biomed, Dept Clin Genet, SE-40530 Gothenburg, Sweden..
    Aravidis, Christos
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för immunologi, genetik och patologi, Medicinsk genetik och genomik.
    Melin, Beatrice
    Umea Univ, Div Oncol, Dept Radiat Sci, SE-90187 Umea, Sweden..
    Nordling, Margareta
    Sahlgrens Univ Hosp, Dept Clin Pathol & Genet, SE-41345 Gothenburg, Sweden.;Univ Gothenburg, Sahlgrenska Acad, Inst Biomed, Dept Clin Genet, SE-40530 Gothenburg, Sweden..
    Stenmark-Askmalm, Marie
    Linkoping Univ, Dept Oncol, SE-58183 Linkoping, Sweden.;Univ Lund Hosp, Dept Clin Genet, SE-22185 Lund, Sweden..
    Lindblom, Annika
    Karolinska Inst, Dept Mol Med & Surg, SE-17176 Stockholm, Sweden.;Karolinska Univ Hosp, Dept Clin Genet, L5 03, SE-17176 Stockholm, Sweden..
    Nilbert, M. E. F.
    Lund Univ, Div Oncol & Pathol, Dept Clin Sci, SE-22381 Lund, Sweden.;Univ Copenhagen, Hvidovre Hosp, Clin Res Ctr, DK-2650 Hvidovre, Denmark..
    Mismatch repair gene mutation spectrum in the Swedish Lynch syndrome population2016Inngår i: Oncology Reports, ISSN 1021-335X, E-ISSN 1791-2431, Vol. 36, nr 5, s. 2823-2835Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Lynch syndrome caused by constitutional mismatch-repair defects is one of the most common hereditary cancer syndromes with a high risk for colorectal, endometrial, ovarian and urothelial cancer. Lynch syndrome is caused by mutations in the mismatch repair (MMR) genes i.e., MLH1, MSH2, MSH6 and PMS2. After 20 years of genetic counseling and genetic testing for Lynch syndrome, we have compiled the mutation spectrum in Sweden with the aim to provide a population-based perspective on the contribution from the different MMR genes, the various types of mutations and the influence from founder mutations. Mutation data were collected on a national basis from all laboratories involved in genetic testing. Mutation analyses were performed using mainly Sanger sequencing and multiplex ligation-dependent probe amplification. A total of 201 unique disease-predisposing MMR gene mutations were identified in 369 Lynch syndrome families. These mutations affected MLH1 in 40%, MSH2 in 36%, MSH6 in 18% and PMS2 in 6% of the families. A large variety of mutations were identified with splice site mutations being the most common mutation type in MLH1 and frameshift mutations predominating in MSH2 and MSH6. Large deletions of one or several exons accounted for 21% of the mutations in MLH1 and MSH2 and 22% in PMS2, but were rare (4%) in MSH6. In 66% of the Lynch syndrome families the variants identified were private and the effect from founder mutations was limited and predominantly related to a Finnish founder mutation that accounted for 15% of the families with mutations in MLH1. In conclusion, the Swedish Lynch syndrome mutation spectrum is diverse with private MMR gene mutations in two-thirds of the families, has a significant contribution from internationally recognized mutations and a limited effect from founder mutations.

  • 9.
    Milkina, Elena
    et al.
    Far Eastern Fed Univ, Sch Biomed, 8 Sukhanova St, Vladivostok 690091, Russia;RAS, Natl Sci Ctr Marine Biol FEB, Vladivostok 690041, Russia.
    Ponomarenko, Arina
    Far Eastern Fed Univ, Sch Biomed, 8 Sukhanova St, Vladivostok 690091, Russia;RAS, Natl Sci Ctr Marine Biol FEB, Vladivostok 690041, Russia.
    Korneyko, Maria
    Far Eastern Fed Univ, Sch Biomed, 8 Sukhanova St, Vladivostok 690091, Russia.
    Lyakhova, Irina
    Far Eastern Fed Univ, Sch Biomed, 8 Sukhanova St, Vladivostok 690091, Russia.
    Zayats, Yulia
    Far Eastern Fed Univ, Sch Biomed, 8 Sukhanova St, Vladivostok 690091, Russia.
    Zaitsev, Sergey
    Far Eastern Fed Univ, Sch Biomed, 8 Sukhanova St, Vladivostok 690091, Russia.
    Mischenko, Polina
    Far Eastern Fed Univ, Sch Biomed, 8 Sukhanova St, Vladivostok 690091, Russia;RAS, Natl Sci Ctr Marine Biol FEB, Vladivostok 690041, Russia.
    Eliseikina, Marina
    RAS, Natl Sci Ctr Marine Biol FEB, Vladivostok 690041, Russia.
    Khotimchenko, Yuri
    Far Eastern Fed Univ, Sch Biomed, 8 Sukhanova St, Vladivostok 690091, Russia;RAS, Natl Sci Ctr Marine Biol FEB, Vladivostok 690041, Russia.
    Shevchenko, Valeryi
    Far Eastern Fed Univ, Sch Biomed, 8 Sukhanova St, Vladivostok 690091, Russia;NN Blokhin Russian Canc Res Ctr, Moscow 115478, Russia.
    Sharma, Hari Shanker
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för kirurgiska vetenskaper, Anestesiologi och intensivvård.
    Bryukhovetskiy, Igor
    Far Eastern Fed Univ, Sch Biomed, 8 Sukhanova St, Vladivostok 690091, Russia;RAS, Natl Sci Ctr Marine Biol FEB, Vladivostok 690041, Russia.
    Interaction of hematopoietic CD34(+) CD45(+) stem cells and cancer cells stimulated by TGF-beta 1 in a model of glioblastoma in vitro2018Inngår i: Oncology Reports, ISSN 1021-335X, E-ISSN 1791-2431, Vol. 40, nr 5, s. 2595-2607Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The majority of modern treatment methods for malignant brain tumors are not sufficiently effective, with a median survival time varying between 9 and 14 months. Metastatic and invasive processes are the principal characteristics of malignant tumors. The most important pathogenic mechanism is epithelial-mesenchymal transition (EMT), which causes epithelial cells to become more mobile, and capable of invading the surrounding tissues and migrating to distant organs. Transforming growth factor-beta 1 (TGF-beta 1) serves a key role in EMT-inducing mechanisms. The current study presented the interaction between hematopoietic stem cells and glioblastoma cells stimulated by TGF-beta 1 in vitro. The materials for the study were hematopoietic progenitor cell antigen CD34(+) hematopoietic stem cells (HSCs) and U87 glioblastoma cells. Cell culture methods, automated monitoring of cell-cell interactions, confocal laser microscopy, flow cytometry and electron microscopy were used. It was demonstrated that U87 cells have a complex communication system, including adhesive intercellular contacts, areas of interdigitation with dissolution of the cytoplasm, cell fusion, communication microtubes and microvesicles. TGF-beta 1 affected glioblastoma cells by modifying the cell shape and intensifying their exocrine function. HSCs migrated to glioblastoma cells, interacted with them and exchanged fluorescent tags. Stimulation of cancer cells with TGF-beta 1 weakened the ability of glioblastoma cells to attract HSCs and exchange a fluorescent tag. This process stimulated cancer cell proliferation, which is an indication of the ability of HSCs to 'switch' the proliferation and invasion processes in glioblastoma cells.

  • 10.
    Mitran, Bogdan
    et al.
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Farmaceutiska fakulteten, Institutionen för läkemedelskemi, Theranostics.
    Andersson, Ken Gosta
    KTH Royal Inst Technol, Sch Engn Sci Chem Biotechnol & Hlth, Dept Prot Sci, SE-10691 Stockholm, Sweden.
    Lindström, Elin
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Farmaceutiska fakulteten, Institutionen för läkemedelskemi.
    Garousi, Javad
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för immunologi, genetik och patologi, Medicinsk strålningsvetenskap.
    Rosestedt, Maria
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Farmaceutiska fakulteten, Institutionen för läkemedelskemi, Theranostics.
    Tolmachev, Vladimir
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för immunologi, genetik och patologi, Medicinsk strålningsvetenskap.
    Stahl, Stefan
    KTH Royal Inst Technol, Sch Engn Sci Chem Biotechnol & Hlth, Dept Prot Sci, SE-10691 Stockholm, Sweden.
    Orlova, Anna
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Farmaceutiska fakulteten, Institutionen för läkemedelskemi, Theranostics. Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för immunologi, genetik och patologi, Medicinsk strålningsvetenskap. Uppsala universitet, Science for Life Laboratory, SciLifeLab.
    Löfblom, John
    KTH Royal Inst Technol, Sch Engn Sci Chem Biotechnol & Hlth, Dept Prot Sci, SE-10691 Stockholm, Sweden.
    Affibody-mediated imaging of EGFR expression in prostate cancer using radiocobalt-labeled DOTA-Z(EGFR:2377)2019Inngår i: Oncology Reports, ISSN 1021-335X, E-ISSN 1791-2431, Vol. 41, nr 1, s. 534-542Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The epidermal growth factor receptor (EGFR) is often overexpressed during prostate cancer (PCa) progression towards androgen-independence after hormone therapy, but the overexpression is lower than in other types of cancers. Despite the low expression, EGFR has emerged as a promising therapeutic target for patients with castration-resistant PCa. Non-invasive methods for determination of EGFR expression in PCa can serve for patient stratification and therapy response monitoring. Radionuclide imaging probes based on affibody molecules (7 kDa) provide high contrast imaging of cancer-associated molecular targets. We hypothesized that the anti-EGFR affibody molecule DOTA-Z(EGFR:2377) labeled with Co-55 (positron-emitter, T1/2=17.5 h) would enable imaging of EGFR expression in PCa xenografts. The human PCa cell line DU-145 was used for in vitro and in vivo experiments and Co-57 was used as a surrogate for Co-55 in the present study. Binding of Co-57-DOTA-Z(EGFR:2377) to EGFR-expressing xenografts was saturable with anti-EGFR monoclonal antibody cetuximab, which would motivate the use of this tracer for monitoring the receptor occupancy during treatment. A significant dose-dependent difference in radioactivity accumulation in tumors and normal organs was observed when the biodistribution was studied 3 h after the injection of 10 and 35 mu g of Co-57-DOTA-Z(EGFR:2377): At lower doses the tumor uptake was 2-fold higher although tumor-to-organ ratios were not altered. For clinically relevant organs for PCa, tumor-to-organ ratios increased with time, and at 24 h pi were 2.2 +/- 0.5 for colon, 7 +/- 2 for muscle, and 4.0 +/- 0.7 for bones. Small animal SPECT/CT images confirmed the capacity of radiocobalt labeled DOTA-Z(EGFR:2377) to visualize EGFR expression in PCa. In conclusion, the present study demonstrated the feasibility of using the radiocobalt labeled anti-EGFR affibody conjugate Z(EGFR:2377) as an imaging agent for in vivo visualization of low EGFR-expressing tumors, like PCa, and for monitoring of receptor occupancy during cetuximab therapy as well as the importance of optimal dosing in order to achieve higher sensitivity molecular imaging.

  • 11.
    Nordberg, Erika
    et al.
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi.
    Orlova, Anna
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi.
    Friedman, M.
    Tolmachev, Vladimir
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi.
    Stahl, S.
    Nilsson, F. Y.
    Glimelius, Bengt
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi.
    Carlsson, Jörgen
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi.
    In vivo and in vitro uptake of In-111, delivered with the affibody molecule(Z(EGFR:955))(2), in EGFR expressing tumour cells2008Inngår i: Oncology Reports, ISSN 1021-335X, E-ISSN 1791-2431, Vol. 19, nr 4, s. 853-857Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The epidermal growth factor receptor, EGFR, is overexpressed in many carcinomas. Targeting this receptor with radionuclides is important for imaging and therapy applications in nuclear medicine. We investigated the in vitro and in vivo properties of a new high affinity EGFR binding affibody molecule, (Z(EGFR:955))(2), when conjugated with CHXA"-DTPA and labelled with In-111. The binding time patterns and retention studies were performed using cultured squamous carcinoma A431 cells that overexpress EGFR. In the in vivo studies, female BALB/c nu/nu mice carrying tumours from xenografted A431 cells were used. The in vitro studies showed EGFR specific binding, high uptake and good retention of In-111 when delivered as [In-111](Z(EGFR:955))(2). The retention after 72 h of incubation was 38.0 +/- 1.15% of the initial level. The biodistribution study showed a tumour specific In-111 uptake of 3.8 +/- 1.4% of injected dose per gram turnout tissue 4 h post-injection. The tumour to blood ratio was 9.1 and the tumours could easily be visualized with a gamma camera at this time-point. In-111 delivered with [In-111](Z(EGFR:955))(2) gave an EGFR specific uptake and the results indicated that the (Z(EGFR:955))(2) affibody molecule is a candidate for radionuclide-based tumour imaging. Potential therapy applications are discussed.

  • 12.
    Persson, Mikael I.
    et al.
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi, Enheten för biomedicinsk strålningsvetenskap.
    Gedda, Lars
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi, Enheten för biomedicinsk strålningsvetenskap.
    Jensen, H. J.
    Danmark.
    Lundqvist, Hans
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi, Enheten för biomedicinsk strålningsvetenskap.
    Malmström, Per-Uno
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för kirurgiska vetenskaper.
    Tolmachev, Vladimir
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi, Enheten för biomedicinsk strålningsvetenskap.
    Astatinated trastuzumab, a putative agent for radionuclide immunotherapy of ErbB2-expressing tumours2006Inngår i: Oncology Reports, ISSN 1021-335X, E-ISSN 1791-2431, Vol. 15, nr 3, s. 673-80Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The anti-ErbB2 antibody trastuzumab is used for the treatment of patients with advanced breast cancer, resulting in a response rate of 40-60%. Coupling with a cytotoxic nuclide, e.g. alpha-emitting 211At, may further increase tumour response. The tumour-targeting properties of trastuzumab, astatinated using N-succinimidyl-para-(tri-n-methylstannyl)-benzoate, were evaluated and compared with those of radioiodinated trastuzumab in this study. We found that astatinated trastuzumab retains high specificity towards ErbB2. While the immunoreactive fraction of radioiodinated trastuzumab was higher than that of astatinated trastuzumab (76+/-9% versus 54+/-28%), both radioconjugates showed high affinity (KD 0.75+/-0.16 nM versus 1.8+/-0.3 nM). A growth inhibition study indicated a dose-dependent cell deactivation, in which approximately 74 cell-associated astatine decays per cell gave a survival fraction of 4.5+/-0.8x10(-4). Results of a comparative animal study on normal mice gave no indication that astatination would have any adverse effects on the biodistribution of the antibody. In conclusion, the results of the study suggest that astatinated trastuzumab is a promising candidate for treating ErbB2-expressing tumours.

  • 13.
    Shevchenko, Valery
    et al.
    Far Eastern Fed Univ, Sch Biomed, 8 Sukhanova St, Vladivostok 690091, Russia;Minist Hlth Russia, NN Blokhin Natl Med Res Ctr Oncol, Moscow 115478, Russia.
    Arnotskaya, Nataliya
    Minist Hlth Russia, NN Blokhin Natl Med Res Ctr Oncol, Moscow 115478, Russia.
    Korneyko, Maria
    Far Eastern Fed Univ, Sch Biomed, 8 Sukhanova St, Vladivostok 690091, Russia.
    Zaytsev, Sergry
    Far Eastern Fed Univ, Sch Biomed, 8 Sukhanova St, Vladivostok 690091, Russia.
    Khotimchenko, Yuriy
    Far Eastern Fed Univ, Sch Biomed, 8 Sukhanova St, Vladivostok 690091, Russia.
    Sharma, Hary Shanker
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för kirurgiska vetenskaper, Anestesiologi och intensivvård.
    Bryukhovetskiy, Igor
    Far Eastern Fed Univ, Sch Biomed, 8 Sukhanova St, Vladivostok 690091, Russia;RAS, Natl Sci Ctr Marine Biol FEB, Vladivostok 690041, Russia.
    Proteins of the Wnt signaling pathway as targets for the regulation of CD133(+) cancer stem cells in glioblastoma2019Inngår i: Oncology Reports, ISSN 1021-335X, E-ISSN 1791-2431, Vol. 41, nr 5, s. 3080-3088Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Glioblastoma multiforme (GBM) is one of the most aggressive types of brain tumor and is highly resistant to therapy. The median survival time for patients with GBM is 15 months. GBM resistance to treatment is associated with cancer stem cells (CSCs). CD133 membrane glycoprotein is the best-known marker of GBM CSCs. The Wnt signaling pathway plays an important role in the proliferation of all stem cells. To the best of our knowledge, the present study was the first to examine the expression levels of proteins associated with the Wnt signaling pathway in CD133(+) CSCs of human GBM. Furthermore, potential targets that may regulate CD133(+) CSCs in human GBM were investigated. The human GBM U-87MG cell line was cultured in neurobasal medium supplemented with B27, fibroblast growth factor, epidermal growth factor and no serum. Immunohistochemical characteristics of glioma spheres were investigated based on the expression of key markers of CSCs. CD133(+) cells were extracted from glioma spheres by cell sorting and then lysed. High-performance liquid chromatography-mass spectrometry was used for proteome analysis. Lysates of CD133(-) cells in GBM were used for comparison. The present study was the first to describe the conceptual proteome differences between GBM and CD133(+) CSCs of the common pool. Major differences were identified in the glycolysis/gluconeogenesis, focal adhesion, tight junction and Wnt signaling pathways. This study aimed to analyze the crucial role that proteins of the Wnt signaling pathway play in stem cell proliferation. The identified proteins were analyzed for their association with the Wnt signaling pathway using the international open databases PubMed, Protein Analysis Through Evolutionary Relationships, Gene Ontology, Kyoto Encyclopedia of Genes and Genomes and Search Tool for the Retrieval of Interacting Genes/Proteins. An increased expression of 12 proteins associated with the Wnt signaling pathway were identified in GBM CD133(+) CSCs, which included catenin beta-1, disheveled associated activator of morphogenesis 1, RAC family small GTPase 2 and RAS homolog gene family member A, a number of which are also associated with adherens junctions. The Wnt signaling pathway is not upregulated in CSCs; however, the high expression levels of adenomatous polyposis coli, beta-catenin, C-terminal binding protein (CtBP) and RuvB-like AAA ATPase 1 (RUVBL1 or Pontin52) proteins suggest the possibility of alternative activation of specific genes in the nuclei of these cells. Calcyclin-binding protein, casein kinase II alpha, casein kinase II beta, CtBP1, CtBP2, CUL1 and RUVBL1 proteins may be used as targets for the pharmaceutical regulation of CSCs in complex GBM treatment.

  • 14.
    Skírnisdóttir, Ingiridur
    et al.
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för kvinnors och barns hälsa, Obstetrik & gynekologi.
    Seidal, T
    Department of Pathology, Halmstad Medical Central Hospital, Sweden.
    The apoptosis regulators p53, bax and PUMA: Relationship and impact on outcome in early stage (FIGO I-II) ovarian carcinoma after post-surgical taxane-based treatment2012Inngår i: Oncology Reports, ISSN 1021-335X, E-ISSN 1791-2431, Vol. 27, nr 3, s. 741-747Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The objective of this study was to evaluate the prognostic effect of the apoptosis regulators p53, bax and PUMA for recurrent disease and disease-free survival (DFS) in a series of 105 patients in FIGO-stages I-II with epithelial ovarian cancer, all treated with post-surgical platinum-taxane chemotherapy. For the detection of positivity of the biological markers p53, bax and PUMA the techniques of tissue microarrays and immunohistochemistry (IHC) were used. In tumors the frequency of p53 positivity was 24%, that of bax positivity was 83%, and strong positivity was found for PUMA (43%). The bax status was related to tumor grade (P=0.029). Positive staining for bax was related to strong positivity of PUMA in the tumors (P=0.004). The p53, bax or PUMA status alone or concomitant (p53 bax, p53 PUMA and bax PUMA) were not related to age, histopathological subtype, serous/non-serous tumors or type of the staging procedure at primary surgery. In survival analysis p53-positive tumors (P=0.014) and concomitant p53-positive and weak PUMA-positive tumors (P=0.015) were significantly correlated with shorter DFS. Concomitant p53-negative and bax-positive tumors were significantly correlated with longer survival (P=0.019). FIGO-stage (OR=6.0) and p53 status (OR=4.1) were predictive factors for tumor recurrence in logistic regression analysis and independent prognostic factors (HR=2.4 for both) in multivariate Cox regression analysis. In a separate Cox multivariate regression analysis the p53 bax status (HR=2.2) was an independent prognostic factor for DFS. The p53 PUMA status (HR=0.4) was not an independent prognostic factor, however, a borderline significance (P=0.07) was noted. Our results indicate that FIGO stage and p53 status alone were independent predictive factors for recurrence and prognostic factors for survival. Furthermore, p53 bax status was an independent prognostic factor for survival in this study.

  • 15.
    Skírnisdóttir, Ingirídur
    et al.
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för kvinnors och barns hälsa.
    Lindborg, Katarina
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för kvinnors och barns hälsa.
    Sorbe, Bengt
    Adjuvant chemotherapy with carboplatin and taxane compared with single drug carboplatin in early stage epithelial ovarian carcinoma2007Inngår i: Oncology Reports, ISSN 1021-335X, E-ISSN 1791-2431, Vol. 18, nr 5, s. 1249-1256Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The objective of the present study was to compare recurrence-free survival (RFS) in early stages (FIGO stages I-II) of epithelial ovarian cancer after adjuvant chemotherapy with carboplatin and a taxane (113 patients) and with carboplatin alone (27 patients). The distribution of clinical and pathological prognostic factors as well as type of primary surgery were comparable in the two groups. Recurrence rate was 21% and RFS was 79% in the series of patients treated with taxane-based chemotherapy and 19% and 81%, respectively, in the series of patients who received single drug carboplatin. Thus, no significant differences were recorded. The major toxicities in the present study were myelosuppression (46%) and neuro-toxicity (26%). Neuro-toxicity was more frequently (P=0.007) recorded and of higher grade (P=0.011) for patients in the carboplatin-taxane series compared with patients in the carboplatin series. RFS for patients in FIGO-stage I was 85% and for patients in FIGO-stage II only 47%. In a multivariate logistic regression analysis of predictive factors for tumor recurrence in the complete series (n=140) the FIGO stage was the only independent and significant (P=0.0006) predictive factor with an odds ratio of 6.4 (95% CI: 2.2-18.9) for stage II versus IA-C. Age, tumor grade and type of adjuvant chemotherapy (+/- taxane) were not significant predictive factors. In the present study, although based on a limited number of patients, we could not find any improvement in recurrence rate or recurrence-free survival for patients treated with a carboplatin-taxane combination regimen compared with patients treated with carboplatin monotherapy. The spectrum of side effects was also in favor of the monotherapy regimen. Further, larger randomized studies are needed to give a final and fully conclusive answer to this question.

  • 16.
    Steffen, Ann-Charlott
    et al.
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi, Enheten för biomedicinsk strålningsvetenskap.
    Almqvist, Ylva
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi, Enheten för radiologi.
    Chyan, Ming-Kuan
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi, Enheten för onkologi.
    Lundqvist, Hans
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi, Enheten för biomedicinsk strålningsvetenskap.
    Tolmachev, Vladimir
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi, Enheten för biomedicinsk strålningsvetenskap.
    Wilbur, D. Scott
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi, Enheten för onkologi.
    Carlsson, Jörgen
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi, Enheten för biomedicinsk strålningsvetenskap.
    Biodistribution of 211At labeled HER-2 binding affibody molecules in mice2007Inngår i: Oncology Reports, ISSN 1021-335X, E-ISSN 1791-2431, Vol. 17, nr 5, s. 1141-1147Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The size of affibody molecules makes them suitable as targeting agents for targeted radiotherapy with the alpha-emitter 211At, since their biokinetic properties match the short physical half-live of 211At. In this study, the potential for this approach was investigated in vivo. Two different HER-2 binding affibody molecules were radiolabeled with 211At using both the linker PAB (N-succinimidyl-para-astatobenzoate) and a decaborate-based linker, and the biodistribution in tumor-bearing nude mice was investigated. The influence of L-lysine and Na-thiocyanate on the 211At uptake in normal tissues was also studied. Based on the biokinetic information obtained, the absorbed dose was calculated for different organs. Compared with a previous biodistribution with 125I, the 211At biodistribution using the PAB linker showed higher uptake in lungs, stomach, thyroid and salivary glands, indicating release of free 211At. When the decaborate-based linker was used, the uptake in those organs was decreased, but instead, high uptake in kidneys and liver was found. The uptake, when using the PAB linker, could be significantly reduced in some organs by the use of L-lysine and/or Na-thiocyanate. In conclusion, affibody molecules have suitable blood-kinetics for targeted radionuclide therapy with 211At. However, the labeling chemistry affects the distribution in normal organs to a high degree and needs to be improved to allow clinical use.

  • 17. Tang, Bo
    et al.
    Du, Jian
    Wang, Jingwen
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för cell- och molekylärbiologi.
    Tan, Guang
    Gao, Zhenming
    Wang, Zhongyu
    Wang, Liming
    Alpinetin suppresses proliferation of human hepatoma cells by the activation of MKK7 and elevates sensitization to cis-diammined dichloridoplatium2012Inngår i: Oncology Reports, ISSN 1021-335X, E-ISSN 1791-2431, Vol. 27, nr 4, s. 1090-1096Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Alpinetin is a type of novel plant flavonoid derived from Alpinia katsumadai Hayata, found to possess strong antihepatoma effects. However, the detailed antitumor mechanism of Alpinetin remains unclear. Mitogen-activated protein kinase kinase-7 (MKK7) can regulate cellular growth, differentiation and apoptosis. The aim of this study was to investigate the role of MKK7 in the anti-hepatoma effect mediated by Alpinetin. HepG2 cells were treated with Alpinetin at various doses and for different times, and the levels of phosphorylated MKK7 (p-MKK7) and total MKK7 were tested by RT-PCR and Western blotting. Following transient transfection with RNA interference, cell viability and cell cycle stage were determined using methyl thiazolyl tetrazolium assay and flow cytometry, in order to assess the antitumor action of Alpinetin. In addition, chemosensitization to cis-diammined dichloridoplatium (CDDP) by Alpinetin was assessed by cell counting array and the cell growth inhibitory rate was calculated. The results showed that Alpinetin suppressed HepG2 cell proliferation and arrested cells in the G0/G1 phase by up-regulating the expression levels of p-MKK7. On the contrary, inhibiting the expression of MKK7 reversed the antitumor effect of Alpinetin. Moreover, Alpinetin enhanced the sensitivity of HepG2 hepatoma cells to the chemotherapeutic agent CDDP. Taken together, our studies indicate that activation of MKK7 mediates the anti-hepatoma effect of Alpinetin. MKK7 may be a putative target for molecular therapy against hepatoma and Alpinetin could serve as a potential agent for the development of hepatoma therapy.

  • 18. Tina, Elisabet
    et al.
    Prenkert, Malin
    Höglund, Martin
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för medicinska vetenskaper.
    Paul, Christer
    Tidefelt, Ulf
    Topoisomerase II alpha expression in acute myeloid leukaemia cells that survive after exposure to daunorubicin or ara-C2009Inngår i: Oncology Reports, ISSN 1021-335X, E-ISSN 1791-2431, Vol. 22, nr 6, s. 1527-1531Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Patients diagnosed with acute myeloid leukaemia are often treated with a combination of daunorubicin and 1-beta-D-arabinofuranosylcytosine (ara-C). Both daunorubicin and ara-C exert their effects in the cell nucleus but by different mechanisms, i.e. daunorubicin causes double stranded DNA breaks by inhibition of the nuclear enzyme, topoisomerase (topo) IIalpha, whereas ara-C is an anti-metabolite that integrates with DNA during DNA synthesis and causes cell cycle arrest. Despite the initial efficacy of these drugs, resistance often develops in the clinical setting. The mechanisms underlying clinical resistance to these drugs are poorly understood, but may be associated with an increase in the proportion of topo IIalpha negative cells. Therefore, the aim of this study was to determine whether daunorubicin treatment results in increased numbers of topo IIalpha negative subpopulations in vitro. Acute myeloid leukaemia cells isolated from 12 consenting patients were treated for 24 h with increasing concentrations of daunorubicin or ara-C and the proportion of topo IIalpha-negative cells in surviving cell populations determined by flow cytometry. Treatment with daunorubicin, but not ara-C, resulted in a significant increase in the proportion of topo IIalpha negative cells (p=0.0023). These results suggest that daunorubicin may act by cell cycle arrest and/or by selection of pre-existing topo IIalpha negative subpopulations. Both of these mechanisms can theoretically contribute to a reduced efficacy of a second dose of daunorubicin. The clinical relevance of these interactions should be further elucidated in experimental and clinical studies.

  • 19.
    Wei, Q.
    et al.
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi, Enheten för biomedicinsk strålningsvetenskap.
    Shui, Y.
    Zheng, S.
    Wester, Kenneth
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi, Enheten för biomedicinsk strålningsvetenskap.
    Nordgren, Hans
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för genetik och patologi.
    Nygren, Peter
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för radiologi, onkologi och strålningsvetenskap, Enheten för onkologi.
    Glimelius, Bengt
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för radiologi, onkologi och strålningsvetenskap, Enheten för onkologi.
    Carlsson, Jörgen
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi, Enheten för biomedicinsk strålningsvetenskap.
    EGFR, HER2 and HER3 expression in primary colorectal carcinomas and corresponding metastases: Implications for targeted radionuclide therapy2011Inngår i: Oncology Reports, ISSN 1021-335X, E-ISSN 1791-2431, Vol. 25, nr 1, s. 3-11Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Members of the epidermal growth factor receptor, EGER, family are interesting as targets for radionuclide therapy using targeting agents labeled with alpha- or beta-emitting radionuclides, especially when EGFR-positive colorectal carcinomas, CRC, are resistant to EGFR inhibiting agents like cetuximab and various tyrosine kinase inhibitors. The expression of EGFR, HER2 and HER3 was therefore analyzed in CRC samples from primary tumors, corresponding lymph node metastases and, in a few cases, liver metastases. The expression of HER2 and EGFR was scored from immunohistochemical preparations using the HercepTest criteria 0, 1+, 2+ or 3+ for cellular membrane staining while HER3 expression was scored as no, weak or strong cytoplasm staining. Material from 60 patients was analyzed. The number of EGFR 2+ or 3+ positive primary tumors was 16 out of 56 (29%) and for lymph node metastases 8 out of 56 (14%) whereas only one out of nine (11%) liver metastases were positive. Thus, there was lower EGFR positivity in the metastases. Only one among 53 patients was strongly HER2 positive and this in both the primary tumor and the metastasis. Eight out of 49 primary tumors (16%) were strongly HER3 positive and the corresponding numbers for lymph node metastases were 9 out of 49 (18%) and for liver metastases 2 out of 9 (22%). The observed number of strongly EGFR positive cases was somewhat low but EGFR might be, for the cases with high EGFR expression in metastases, a target for radionuclide therapy. HER2 seems not to be of such interest due to rare expression, neither HER3 due to mainly expression in the cytoplasm. The requirements for successful EGFR targeted radionuclide therapy are discussed, as well as patient inclusion criteria related to radionuclide therapy.

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