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Ladjevardi, Sam
Publications (10 of 13) Show all publications
von Below, C., Wassberg, C., Norberg, M., Tolf, A., Kullberg, J., Ladjevardi, S., . . . Ahlström, H. (2017). Additional value of magnetic resonance-targeted biopsies to standard transrectal ultrasound-guided biopsies for detection of clinically significant prostate cancer. Scandinavian journal of urology, 51(2), 107-113.
Open this publication in new window or tab >>Additional value of magnetic resonance-targeted biopsies to standard transrectal ultrasound-guided biopsies for detection of clinically significant prostate cancer
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2017 (English)In: Scandinavian journal of urology, ISSN 2168-1805, E-ISSN 2168-1813, Vol. 51, no 2, 107-113 p.Article in journal (Refereed) Published
Abstract [en]

OBJECTIVE: The aim of this study was to evaluate the additional value of magnetic resonance imaging-targeted biopsy (MRI-TB) to standard transrectal ultrasound-guided biopsy (SB) for detection of clinically significant prostate cancer (PCa). An additional aim was to compare the biopsy results to MRI evaluation using a Likert scale.

MATERIALS AND METHODS: Patients with newly diagnosed localized PCa (n = 53) by clinical routine SB were prospectively included. The majority of the patients were scheduled for curative therapy before enrollment. The patients underwent multiparametric MRI (mpMRI) at 3 T using an endorectal coil followed by two MRI-TBs, using ultrasound with cognitive fusion. All included patients underwent MRI-TB, even those who had low to very low suspicion of significant PCa on mpMRI. The detection rate of significant cancer on SB versus SB + MRI-TB was compared in the 53 included patients and with whole-mounted histopathology as reference in 34 cases. Comparison of the biopsy results to MRI evaluation and interreader agreement calculation of five-point Likert score evaluation were performed.

RESULTS: In total, 32 significant (Gleason ≥7) PCa were detected by SB, while SB + MRI-TB detected an additional five significant PCa. MRI-TB alone detected 20 and missed 17 significant PCa. Ten of the significant PCa cases missed by MRI-TB had a Likert score of 3 or lower. Interreader agreement using the Likert scale was high, with a kappa value of 0.77 (95% confidence interval 0.63-0.92, p < 0.0001).

CONCLUSION: Detection of significant PCa increased by adding MRI-TB to SB. This may not be of enough clinical value to justify the use of targeted biopsies in this patient group.

Keyword
Magnetic resonance imaging, prostatic neoplasm, targeted biopsies, transrectal ultrasound-guided biopsy
National Category
Urology and Nephrology Radiology, Nuclear Medicine and Medical Imaging
Identifiers
urn:nbn:se:uu:diva-325563 (URN)10.1080/21681805.2017.1281346 (DOI)000403629400003 ()28635568 (PubMedID)
Funder
Swedish Cancer Society
Available from: 2017-06-26 Created: 2017-06-26 Last updated: 2017-10-19Bibliographically approved
Regula, N. K., Lubberink, M., Jorulf, H., Ladjevardi, S., Häggman, M. & Sörensen, J. (2017). Dynamic Imaging of Prostate Cancer with 11C-acetate PET/CT. Paper presented at Annual Meeting of the Society-of-Nuclear-Medicine-and-Molecular-Imaging (SNMMI), JUN 10-14, 2017, Denver, CO. Journal of Nuclear Medicine, 58(S1), Article ID 662.
Open this publication in new window or tab >>Dynamic Imaging of Prostate Cancer with 11C-acetate PET/CT
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2017 (English)In: Journal of Nuclear Medicine, ISSN 0161-5505, E-ISSN 1535-5667, Vol. 58, no S1, 662Article in journal, Meeting abstract (Other academic) Published
Abstract [en]

Objectives: Dynamic 11C-acetate PET/CT can be used to study tissue perfusion and carbon flux simultaneously, but studies in cancer are limited. We investigated the kinetics of 11C-acetate in prostate cancer subjects using parametric images with an image-derived input function (IDIF).

Methods: Twenty-one patients with newly diagnosed low-moderate risk prostate cancer were studied. All underwent pelvic MRI. Dynamic 11C-acetate (5 MBq/kg) PET/CT of the pelvis was acquired for 32 minutes with 32 time frames. An IDIF was acquired from iliac vessels with multiple small regions of interest (ROIs) and a standardized metabolite correction. Parametric images of K1 (extraction), k2 (oxidative metabolism) and Vd (=K1/k2, anabolic metabolism defined as carbon retention) were constructed using a one-tissue compartment model. ROIs of the largest cancer region in each patient and normal prostate tissue were drawn using information from MRI (T2 and DWI images) and from post-surgical histopathology of whole prostate sections (n=7).

Results: Mean PSA was 8.3±3.9. Median Gleason Sum was 6 (range 5-7). K1, Vd and SUVs were higher in cancerous regions compared to normal prostate for all patients (p<0.001). PSA correlated to early SUV (r=0.50, p=0.02) and K1 (r=0.48, p=0.03). Early and late SUVs were correlated to Vd (r>0.76, p<0.001) and K1 (r>0.61, p<0.005).

Conclusion: Parametric images could be used to visualize the 11C-acetate kinetics of the prostate. In this cohort of relatively low-risk cancers, PSA values were related to cancer perfusion. SUV of cancerous regions at any time point is primarily associated with anabolic metabolism. Research Support: Swedish Cancer Foundation (Cancerfonden)

National Category
Radiology, Nuclear Medicine and Medical Imaging
Identifiers
urn:nbn:se:uu:diva-333339 (URN)000404949903062 ()
Conference
Annual Meeting of the Society-of-Nuclear-Medicine-and-Molecular-Imaging (SNMMI), JUN 10-14, 2017, Denver, CO
Funder
Swedish Cancer Society
Available from: 2017-11-14 Created: 2017-11-14 Last updated: 2017-11-14Bibliographically approved
Weis, J., von Below, C., Tolf, A., Ortiz-Nieto, F., Wassberg, C., Haggman, M., . . . Ahlström, H. (2017). Quantification of metabolite concentrations in benign and malignant prostate tissues using 3D proton MR spectroscopic imaging. Journal of Magnetic Resonance Imaging, 45(4), 1232-1240.
Open this publication in new window or tab >>Quantification of metabolite concentrations in benign and malignant prostate tissues using 3D proton MR spectroscopic imaging
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2017 (English)In: Journal of Magnetic Resonance Imaging, ISSN 1053-1807, E-ISSN 1522-2586, Vol. 45, no 4, 1232-1240 p.Article in journal (Refereed) Published
Abstract [en]

PURPOSE: To estimate concentrations of choline (Cho), spermine (Spm), and citrate (Cit) in prostate tissue using 3D proton magnetic resonance spectroscopic imaging (MRSI) with water as an internal concentration reference as well as to assess the relationships between the measured metabolites and also between the metabolites and apparent diffusion coefficient (ADC).

MATERIALS AND METHODS: Forty-six prostate cancer patients were scanned at 3T. Spectra were acquired with the point-resolved spectroscopy (PRESS) localization technique. Single-voxel spectra of four healthy volunteers were used to estimate T1 relaxation time of Spm. Spm, Cho concentrations, and ADC values of benign prostate tissues were correlated with Cit content.

RESULTS: The T1 value, 708 ± 132 msec, was estimated for Spm. Mean concentrations in the benign peripheral zone (PZ) were Cho, 4.5 ± 1 mM, Spm, 13.0 ± 4.4 mM, Cit, 64.4 ± 16.1 mM. Corresponding values in the benign central gland (CG) were Cho, 3.6 ± 1 mM, Spm, 13.3 ± 4.5 mM, Cit, 34.3 ± 12.9 mM. Concentrations of Cit and Spm were positively correlated in the benign PZ zone (r = 0.730) and CG (r = 0.664). Positive correlation was found between Cit and Cho in the benign CG (r = 0.705). Whereas Cit and ADC were positively correlated in the benign PZ (r = 0.673), only low correlation was found in CG (r = 0.265).

CONCLUSION: We have shown that it is possible to perform water-referenced quantitative 3D MRSI of the prostate at the cost of a relatively short prolongation of the acquisition time. The individual metabolite concentrations provide additional information compared to the previously used metabolite-to-citrate ratios.

National Category
Radiology, Nuclear Medicine and Medical Imaging
Identifiers
urn:nbn:se:uu:diva-304633 (URN)10.1002/jmri.25443 (DOI)000397489100030 ()27556571 (PubMedID)
Available from: 2016-10-06 Created: 2017-05-30 Last updated: 2017-05-30Bibliographically approved
Ladjevardi, S., Weis, J., Sörensen, J., Tolf, A., Häggman, M., von Below, C. & Jorulf, H. (2014). A Comparison of Different Imaging Techniques for Localisation of Cancers in the Prostate. Open Prostate Cancer Journal, 7, 1-6.
Open this publication in new window or tab >>A Comparison of Different Imaging Techniques for Localisation of Cancers in the Prostate
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2014 (English)In: Open Prostate Cancer Journal, ISSN 1876-8229, Vol. 7, 1-6 p.Article in journal (Refereed) Published
Abstract [en]

The diagnostic accuracy of standard transrectal ultrasound-guided (TRUL) biopsy is limited due to the finite number of cores that can be obtained. It has been shown that the technique is not sufficiently reliable in defining the location and extent of prostatic cancer. The main aim of this study was to investigate the effectiveness of magnetic resonance imaging (MRI), and positron emission tomography (PET/CT) imaging techniques in pinpointing potential tumour lesions prior to prostate biopsy.

Material and methods

The study cohort consisted of 45 men with a raised prostate specific-antigen (PSA) level and/or suspected prostate cancer (PCa) at digital rectal examinations (DRE). Of the 45 patients, 23 had PCa detected with core needle biopsy (CNB). All had 11C acetate PET/CT imaging. Ten of those 23 patients underwent radical prostatectomy (RP), of those ten patients, eight patients had MR spectroscopic imaging (MRSI) with 3 T and six had diffusion weighted imaging (DWI) with apparent diffusion coefficient calculation (MRI DWI ADC). CNB, PET/CT, 2D MRSI and ADC map results were compared with postoperative specimen histopathology.

Results

The sensitivity of CNB, PET/CT, MRSI and DWI ADC were 0.53, 0.55, 0.79 and 0.95, whereas the specificity of was 0.88, 0.87, 0.46 and 0.73, respectively.

Conclusion

MRI improves the PCa detection by defining the areas of interest for targeted CNB of the prostate and can reduce the number of biopsies required

National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:uu:diva-225428 (URN)10.2174/1876822901407010001 (DOI)
Available from: 2014-06-03 Created: 2014-06-03 Last updated: 2017-12-05Bibliographically approved
Ladjevardi, S., Auer, G., Castro, J., Ericsson, C., Zetterberg, A., Häggman, M., . . . Jorulf, H. (2014). Prostate biopsy sampling causes hematogenous dissemination of epithelial cellular material. Disease Markers, 707529.
Open this publication in new window or tab >>Prostate biopsy sampling causes hematogenous dissemination of epithelial cellular material
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2014 (English)In: Disease Markers, ISSN 0278-0240, E-ISSN 1875-8630, 707529- p.Article in journal (Refereed) Published
Abstract [en]

The extent of epithelial cellular material (ECM) occurring in venous blood samples after diagnostic core needle biopsy (CNB) was studied in 23 patients with CNB diagnosed prostate cancer without provable metastases and 15 patients without cancer. The data show a significant increase of ECM in the peripheral blood sampled 20 seconds or 30 minutes after the last of 10 CNB procedures compared to the number of ECM detectable in the blood samples taken before the performance of CNB. The data indicate that diagnostic CNB of prostate cancer causes an extensive tissue trauma with a potential risk of cancer cell dissemination.

National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:uu:diva-216770 (URN)10.1155/2014/707529 (DOI)000330893600001 ()
Available from: 2014-01-24 Created: 2014-01-24 Last updated: 2017-12-06Bibliographically approved
Ladjevardi, S., Berglund, A., Varenhorst, E., Bratt, O., Widmark, A. & Sandblom, G. (2013). Treatment with curative intent and survival in men with high-risk prostate cancer: A population-based study of 11 380 men with serum PSA level 20–100 ng/mL. BJU International, 111(3), 381-388.
Open this publication in new window or tab >>Treatment with curative intent and survival in men with high-risk prostate cancer: A population-based study of 11 380 men with serum PSA level 20–100 ng/mL
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2013 (English)In: BJU International, ISSN 1464-4096, E-ISSN 1464-410X, Vol. 111, no 3, 381-388 p.Article in journal (Refereed) Published
Abstract [en]

Study Type - Prognosis inception (cohort)

Level of Evidence 2

What's known on the subject? and What does the study add?

There are two randomized controlled trials showing that radiotherapy can be beneficial for men with locally advanced prostate cancer. The present study confirms the importance of curative treatment for men with high-risk prostate cancer.

OBJECTIVE:

•  To investigate the influence of curative treatment on cause-specific mortality in men diagnosed with prostate cancer (PCa) with serum prostate-specific antigen (PSA) levels between 20 and 100 ng/mL.

MATERIALS AND METHODS:

•  Patients with PCa (T1-4, N0/N1/NX, M0/MX), PSA 20-100 ng/mL and age ≤75 years were identified in the National Prostate Cancer Register of Sweden.

•  Data on co-morbidity diagnoses were obtained from the National Patient Register and cause of death from the Cause of Death Register.

•  Following adjustment for age at diagnosis, co-morbidity burden, Gleason score, T-category, PSA level and cause-specific mortality in relation to treatment were estimated using Cox regression analysis.

RESULT:

•  A total of 11 380 men were diagnosed with PCa between 1996 and 2008 and fulfilled the inclusion criteria.

•  The cumulative 10-year PCa-specific mortality was 36% for patients receiving only palliative treatment and 13% for those treated with curative intent.

•  For the 8462 (74%) patients with PSA levels from 20 to 50 ng/mL at diagnosis, the hazard ratio for death from PCa was 0.23 (95% confidence interval 0.19-0.27) for those treated with curative intent compared with those given palliative treatment after adjusting for age, co-morbidity, T category, PSA level and Gleason score. The corresponding hazard ratio was 0.22 (95% confidence interval 0.17-0.30) for patients with PSA levels from 51 to 100 ng/mL.

CONCLUSION:

•  Treatment with curative intent for men with high-risk PCa was associated with reduced cause-specific mortality and should be considered even when serum PSA exceeds 20 ng/mL.

National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:uu:diva-190088 (URN)10.1111/j.1464-410X.2012.11320.x (DOI)000315395200022 ()22758210 (PubMedID)
Available from: 2013-01-07 Created: 2013-01-07 Last updated: 2017-12-06Bibliographically approved
Ladjevardi, S. (2012). Imaging and Treatment Outcome of Potentially Curable Prostate Cancer. (Doctoral dissertation). Uppsala: Acta Universitatis Upsaliensis.
Open this publication in new window or tab >>Imaging and Treatment Outcome of Potentially Curable Prostate Cancer
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The over-all aim of the present study was to compare the results of treatment with curative intent, with conservative treatment in men with prostate cancer (PCa) without distant metastases.

In a population-based cohort in Sweden, the predictive value of prostate-specific antigen (PSA) was evaluated and the relative survival of men considered plausible candidates for treatment with curative intent was investigated.

We also evaluated the association between curative treatment and cause-specific mortality, and over-all as well as relative survival in men diagnosed with PCa with a serum PSA level between 20 and 100 ng/ml.

Due to the uncertainly of transrectal ultrasound-guided biopsy in the diagnosis of PCa, we created a model for prostate imaging  to increase the safety of guided Core Needle Biopsy (CNB) in men with suspect PCa, thereby improving staging. 

Material and methods. The cohorts in the first three studies were prospectively included in a population-based register (the National Prostate Cancer Register). Study IV was a clinical study on patients included between 2010 and 2011.

Results. Regardless of Gleason Score, a positive relationship between survival and serum PSA level categories in patients with a PSA level> 4 ng/ml was found, but a paradoxical inverse relationship was observed in men with a PSA level < 4 ng/ml. Men with a well-differentiated tumour had a 5-year relative survival exceeding 100% regardless of treatment. The survival rate for moderately and poorly differentiated tumours was poor for men managed conservatively. The 10-year cause-specific mortality for patients with PSA 20-50 ng/ml was 36% for patients treated without and 13% for patients treated with curative intent. For patients with a PSA 50-100 ng/ml the 10-year cause-specific mortality was 55% for conservative and 20% for patients treated with curative intent.

PCa detection by CNB, magnetic resonance imaging (MR) with ADC (Apparent diffusion coefficient), magnetic resonance spectroscopic imaging (MRSI) and Positron Emission Tomography (PET/CT) ¹¹C Acetate imaging applied to 10 sections of the prostate demonstrated clear conformity between MRI ADC mapping and postoperative findings, showing high specificity (87%) and sensitivity (95%).

Conclusion. The inverse relationship between relative survival and PSA at levels below 4 ng/ml should be considered when choosing a PSA cut-off level. Outcome differs little between conservative management and treatment with curative intent in men with localised well- to moderately differentiated tumours over a 10-yr period. For men with poorly differentiated tumours, on the other hand, choice of treatment is crucial for outcome. Treatment with curative intent is beneficial in the group of men with prostate cancer and PSA levels between 20 and 100 ng/ml without distant metastases. A combination of MRI , diffusion ADC and MRSI may provide an improved model for imaging of the prostate for targeted biopsy.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2012. 81 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Medicine, ISSN 1651-6206 ; 759
National Category
Urology and Nephrology Cancer and Oncology Radiology, Nuclear Medicine and Medical Imaging
Identifiers
urn:nbn:se:uu:diva-171754 (URN)978-91-554-8326-5 (ISBN)
Public defence
2012-05-18, Auditorium Minus, Gustavianum, Uppsala, 09:15 (Swedish)
Opponent
Supervisors
Available from: 2012-04-27 Created: 2012-03-27 Last updated: 2013-07-10Bibliographically approved
Ladjevardi, S., Sandblom, G., Berglund, A. & Varenhorst, E. (2010). Tumour Grade, Treatment, and Relative Survival in a Population-based Cohort of Men with Potentially Curable Prostate Cancer. European Urology, 57(4), 631-638.
Open this publication in new window or tab >>Tumour Grade, Treatment, and Relative Survival in a Population-based Cohort of Men with Potentially Curable Prostate Cancer
2010 (English)In: European Urology, ISSN 0302-2838, E-ISSN 1873-7560, Vol. 57, no 4, 631-638 p.Article in journal (Refereed) Published
Abstract [en]

Background: There is insufficient information regarding the benefit of treatment with curative intent for men with localised poorly differentiated prostate cancer (PCa). Objective: To evaluate relative survival in men with potentially curable PCa in relation to Gleason score (GS) and treatment as practiced in the community at large. Design, setting, and participants: A population-based study including all men with localised PCa registered in Sweden's National Prostate Cancer Register. Interventions: Hormonal therapy, watchful waiting, and treatment with curative intent. Measurements: The ratio of observed deaths to expected deaths, determined from survival in the general male population of the same age, was assessed using Poisson regression analysis, with GS and treatment as covariates. Interaction between GS and treatment was tested in a multivariate Cox proportional hazard analysis. Results and limitations: A total of 31 903 men with potentially curable tumour (T1-T3, N0/NX, M0/MX, age < 75 yr, and prostate-specific antigen [PSA] < 20 ng/ml) were identified. GS was recorded for 28 454 of these men. Some 19 606 men (60.8%) were treated with curative intent, and 12 645 men (39.2%) were given either hormonal treatment or expectant management. The ratios between observed and expected survival gradually increased for men with GS 10, with GS to 3.3 for men treated conservatively and to 1.4 for men treated with curative intent. There was a significant interaction between GS and treatment, with a relatively greater benefit from treatment with curative intent for men with high-grade tumours. The results have to be interpreted with some caution, as there was no randomisation between the treatment groups. Conclusions: Survival for men with well-differentiated tumours is close to that of the general population, regardless of treatment, but the outcome is dismal for men with poorly differentiated tumours, whichever treatment is applied. Nevertheless, men with poorly differentiated tumours benefit more from curative treatment than do men with well-differentiated tumours.

Keyword
Epidemiology, Conservative management, Curative management, Prostate cancer, Radical prostatectomy, Radiotherapy
National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:uu:diva-136812 (URN)10.1016/j.eururo.2009.03.007 (DOI)000275739300020 ()
Available from: 2010-12-14 Created: 2010-12-14 Last updated: 2017-12-11Bibliographically approved
Sandblom, G., Ladjevardi, S., Garmo, H. & Varenhorst, E. (2008). The impact of prostate-specific antigen level at diagnosis on the relative survival of 28,531 men with localized carcinoma of the prostate. Cancer, 112(4), 813-9.
Open this publication in new window or tab >>The impact of prostate-specific antigen level at diagnosis on the relative survival of 28,531 men with localized carcinoma of the prostate
2008 (English)In: Cancer, ISSN 0008-543X, E-ISSN 1097-0142, Vol. 112, no 4, 813-9 p.Article in journal (Refereed) Published
Abstract [en]

BACKGROUND: To evaluate the predictive value of prostate-specific antigen (PSA) in a population-based cohort, the authors analyzed relative survival in all men with localized prostate cancer who were registered in the Swedish National Prostate Cancer Register (NPCR) from 1996 to 2005. METHODS: All men aged <75 years with localized tumors were identified in the NPCR. A Poisson regression analysis was performed using observed death as response and the expected death rate as offset. The expected and observed numbers of survivors were calculated with stratification for PSA level and 3 categories of tumor differentiation (Gleason score 2-6, 7, and 8-10). The regression model included PSA as linear splines with a breakpoint at a PSA level of 4 ng/mL and with tumor differentiation as a categoric variable. RESULTS: The Poisson regression analysis indicated a U-shaped curve for all 3 groups, with a negative correlation between PSA and relative survival in men with PSA levels <4 ng/mL and a positive correlation for men with PSA levels >4 ng/mL. The correlation was significant for all 3 groups, but the negative correlation between PSA and relative survival was significantly more pronounced in the group with Gleason scores from 8 to 10 than in the other 2 Gleason score groups. CONCLUSIONS: The demonstration of an inverse correlation between PSA level and relative survival in the group of men with PSA levels <4 ng/mL indicated the presence of a small but clinically important subgroup with undifferentiated tumors who have cells that have lost the ability to secrete PSA. This group should be taken into consideration when deciding on treatment and when choosing a cutoff level in PSA screening programs.

Keyword
prostate cancer, prostate-specific antigen, relative survival, prognosis, Gleason score, population-based
National Category
Urology and Nephrology
Identifiers
urn:nbn:se:uu:diva-88072 (URN)10.1002/cncr.23235 (DOI)000253023700010 ()18098207 (PubMedID)
Available from: 2009-01-20 Created: 2009-01-20 Last updated: 2017-12-14Bibliographically approved
Ladjevardi, S., Sörensen, J., Hellman, P., Juhlin, C. & Wärnberg, F. (2002). [A case report. FDG-PET in occult breast cancer]. Lakartidningen, 99, 524.
Open this publication in new window or tab >>[A case report. FDG-PET in occult breast cancer]
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2002 (English)In: Lakartidningen, Vol. 99, 524- p.Article in journal (Other academic) Published
National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:uu:diva-65698 (URN)
Available from: 2008-10-17 Created: 2008-10-17 Last updated: 2015-06-24
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