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  • 1.
    Kaderi, Mohd Arifin
    et al.
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för genetik och patologi, Hematologi och immunologi.
    Mansouri, Mahmoud
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för genetik och patologi, Hematologi och immunologi.
    Zainuddin, Norafiza
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi.
    Cahill, Nicola
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för genetik och patologi, Hematologi och immunologi.
    Gunnarsson, Rebeqa
    Department of Laboratory Medicine, Stem Cell Center, Hematology and Transplantation, Lund University, Lund, Sweden.
    Jansson, Mattias
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för genetik och patologi, Hematologi och immunologi.
    Kimby, Eva
    Department of Hematology, Karolinska Institutet, Stockholm, Sweden.
    Åleskog, Anna
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för medicinska vetenskaper.
    Lundin, Jeannette
    Departments of Hematology/Oncology, Karolinska University Hospital, Stockholm, Sweden.
    Glimelius, Bengt
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi.
    Melbye, Mads
    Department of Epidemiology Research, Statens Serum Institut, Copenhagen, Denmark.
    Juliusson, Gunnar
    Department of Laboratory Medicine, Stem Cell Center, Hematology and Transplantation, Lund University, Lund, Sweden.
    Jurlander, Jesper
    Department of Hematology, The Leukemia Laboratory, Rigshospitalet, Copenhagen, Denmark.
    Rosenquist, Richard
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för genetik och patologi, Hematologi och immunologi.
    Lack of association between the MDM2 promoter polymorphism SNP309 and clinical outcome in chronic lymphocytic leukemia2010Ingår i: Leukemia research: a Forum for Studies on Leukemia and Normal Hemopoiesis, ISSN 0145-2126, E-ISSN 1873-5835, Vol. 34, nr 3, s. 335-339Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The 309T>G polymorphism in the promoter region of the MDM2gene, known as SNP309, has recently been suggested as an unfavorable prognostic marker in chronic lymphocytic leukemia (CLL) although this has been questioned. To investigate this further, we analyzed the MDM2 SNP309 genotypes in 418 CLL patients and correlated the results with established CLL prognostic factors, time to treatment and overall survival. In this Swedish cohort, no association existed between any particular MDM2 SNP309 genotype, overall survival and time to treatment. Furthermore, no correlation was shown between the MDM2 SNP309 genotypes and Binet stage, IGHV mutational status and recurrent genomic aberrations. In summary, this study argues against the use of the MDM2 SNP309 as a prognostic marker in CLL.

  • 2.
    Zainuddin, Norafiza
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi.
    Molecular Genetic Analysis in B-cell Lymphomas: A Focus on the p53 Pathway and p16INK4a2010Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    The presence of TP53 mutations has been associated with inferior outcome in diffuse large B-cell lymphoma (DLBCL) and chronic lymphocytic leukemia (CLL). In DLBCL, the impact of the TP53 codon 72 polymorphism and MDM2 SNP309 has not been clearly elucidated, whereas MDM2 SNP309 was suggested as a poor-prognostic marker in CLL. In addition, p16INK4a promoter hypermethylation has been implicated as a negative prognostic factor in DLBCL. The aim of this thesis was to further evaluate these molecular markers in well-characterised materials of DLBCL and CLL.

    In paper I, we investigated the prognostic role of TP53 mutation, codon 72 polymorphism and MDM2 SNP309 in DLBCL (n=102). The presence of TP53 mutations (12.7%) correlated with a poor lymphoma-specific and progression-free survival, and a particularly pronounced effect was observed in the germinal center subtype. Neither the MDM2 SNP309 nor the TP53 codon 72 polymorphism had an impact on age of onset or survival. In paper II, we applied pyrosequencing to measure the level of p16INK4a methylation in DLBCL (n=113). Thirty-seven percent of cases displayed p16INK4a methylation; however, no clear association could be observed between degree of methylation and clinical characteristics or lymphoma-specific survival.

    In papers III–IV, we investigated the prognostic role of MDM2 SNP309 (n=418) and TP53 mutation (n=268) in CLL. No correlation was observed between any particular MDM2 SNP309 genotype and time to treatment and overall survival. Furthermore, no association was found between the different MDM2 SNP309 genotypes and established CLL prognostic markers. TP53 mutations were detected in 3.7% of CLL patients; where the majority showed a concomitant 17p-deletion and only three carried TP53 mutations without 17p-deletion. We confirmed a significantly shorter overall survival and time to treatment in patients with both TP53 mutation and 17p-deletion.

    Altogether, our studies could confirm the negative prognostic impact of TP53 mutations in DLBCL, whereas MDM2 SNP309 and TP53 codon 72 polymorphisms appear to lack clinical relevance. We also question the role of p16INKa methylation as a poor-prognostic factor in DLBCL. Finally, the presence of TP53 mutation in CLL appears to be rare at disease onset and instead arise during disease progression.

    Delarbeten
    1. TP53 mutations predict for poor survival in de novo diffuse large B-cell lymphoma of germinal center subtype
    Öppna denna publikation i ny flik eller fönster >>TP53 mutations predict for poor survival in de novo diffuse large B-cell lymphoma of germinal center subtype
    Visa övriga...
    2009 (Engelska)Ingår i: Leukemia research: a Forum for Studies on Leukemia and Normal Hemopoiesis, ISSN 0145-2126, E-ISSN 1873-5835, Vol. 33, nr 1, s. 60-66Artikel i tidskrift (Refereegranskat) Published
    Abstract [en]

    Presence of TP53 mutations has been associated with poor prognosis in diffuse large B-cell lymphoma (DLBCL), although this has remained controversial. The TP53 codon 72 polymorphism has shown negative impact on cancer survival, but this has not been analyzed in DLBCL. Furthermore, the MDM2 SNP309 has been associated with earlier age of onset in DLBCL. Here, we investigated the clinical impact of TP53 mutations, MDM2 SNP309 and TP53 codon 72 polymorphisms on survival in DLBCL of germinal center (GC) and non-GC subtypes. Thirteen of the 102 (12.7%) patients displayed TP53 mutations. Overall, TP53 mutations had a significant effect on lymphoma-specific survival (LSS, P=0.009) and progression-free survival (PFS, P=0.028). In particular, inferior survival was observed in TP53-mutated DLBCLs of GC subtype (LSS, P=0.002 and PFS, P=0.006). Neither MDM2 SNP309 nor the TP53 codon 72 polymorphism had an impact on age of onset or survival. Altogether, our data suggests that TP53 mutations are associated with poor outcome in GC-DLBCL patients.

    Nationell ämneskategori
    Medicin och hälsovetenskap
    Forskningsämne
    Klinisk genetik; Onkologi; Medicinsk genetik; Molekylär genetik
    Identifikatorer
    urn:nbn:se:uu:diva-87756 (URN)10.1016/j.leukres.2008.06.022 (DOI)000261680400009 ()18706692 (PubMedID)
    Projekt
    TP53 mutation, MDM2 SNP309, TP53 codon 72 polymorphism, Diffuse large B-cell lymphoma, Germinal center subtype, Survival
    Tillgänglig från: 2010-02-15 Skapad: 2009-01-12 Senast uppdaterad: 2017-12-14Bibliografiskt granskad
    2. Quantitative evaluation of p16INK4a promoter methylation using pyrosequencing in de novo diffuse large B-cell lymphoma
    Öppna denna publikation i ny flik eller fönster >>Quantitative evaluation of p16INK4a promoter methylation using pyrosequencing in de novo diffuse large B-cell lymphoma
    Visa övriga...
    2011 (Engelska)Ingår i: Leukemia research: a Forum for Studies on Leukemia and Normal Hemopoiesis, ISSN 0145-2126, E-ISSN 1873-5835, Vol. 35, nr 4, s. 438-443Artikel i tidskrift (Refereegranskat) Published
    Abstract [en]

    The p16INK4a tumor suppressor gene can be inactivated by a variety of events including promoter hypermethylation. In diffuse large B-cell lymphoma (DLBCL), p16INK4a methylation has been associated with advanced disease stage and higher IPI. The prognostic impact of p16INK4a methylation in DLBCL remains unclear; however, it has been suggested to correlate with inferior outcome. To further investigate the clinical impact of p16INK4a methylation in DLBCL, promoter methylation of this gene was assessed quantitatively by pyrosequencing. Forty-two of 113 (37%) DLBCL patients with methylation level above 5% were categorized as methylated and subsequently divided into low, intermediate and high methylation categories. Overall, no association was shown between the extent of p16INK4a methylation and patients’ clinical characteristics, except disease stage (P=0.049). Moreover, we could not reveal any impact of p16INK4a methylation on lymphoma-specific survival. Although >25% of p16INK4a methylation correlated with a better progression-free survival (P=0.048), the significance of this finding, if any, needs to be further investigated. In conclusion, our finding questions the role of p16INK4a promoter methylation as a negative prognostic factor in DLBCL.

    Nyckelord
    Diffuse large B-cell lymphoma, p16INK4a, Methylation, Pyrosequencing, Lymphoma-specific survival, Progression-free survival
    Nationell ämneskategori
    Hematologi
    Forskningsämne
    Molekylär genetik; Molekylärbiologi; Genetik; Onkologi
    Identifikatorer
    urn:nbn:se:uu:diva-114516 (URN)10.1016/j.leukres.2010.10.001 (DOI)000288164600004 ()21035853 (PubMedID)
    Tillgänglig från: 2010-02-17 Skapad: 2010-02-17 Senast uppdaterad: 2017-12-12Bibliografiskt granskad
    3. Lack of association between the MDM2 promoter polymorphism SNP309 and clinical outcome in chronic lymphocytic leukemia
    Öppna denna publikation i ny flik eller fönster >>Lack of association between the MDM2 promoter polymorphism SNP309 and clinical outcome in chronic lymphocytic leukemia
    Visa övriga...
    2010 (Engelska)Ingår i: Leukemia research: a Forum for Studies on Leukemia and Normal Hemopoiesis, ISSN 0145-2126, E-ISSN 1873-5835, Vol. 34, nr 3, s. 335-339Artikel i tidskrift (Refereegranskat) Published
    Abstract [en]

    The 309T>G polymorphism in the promoter region of the MDM2gene, known as SNP309, has recently been suggested as an unfavorable prognostic marker in chronic lymphocytic leukemia (CLL) although this has been questioned. To investigate this further, we analyzed the MDM2 SNP309 genotypes in 418 CLL patients and correlated the results with established CLL prognostic factors, time to treatment and overall survival. In this Swedish cohort, no association existed between any particular MDM2 SNP309 genotype, overall survival and time to treatment. Furthermore, no correlation was shown between the MDM2 SNP309 genotypes and Binet stage, IGHV mutational status and recurrent genomic aberrations. In summary, this study argues against the use of the MDM2 SNP309 as a prognostic marker in CLL.

    Nyckelord
    MDM2 SNP309, Chronic lymphocytic leukemia, Binet stage, IGHV mutational status, Genomic aberrations, Prognostic markers
    Nationell ämneskategori
    Medicin och hälsovetenskap
    Forskningsämne
    Klinisk genetik; Medicin; Onkologi; Medicinsk genetik; Molekylär genetik
    Identifikatorer
    urn:nbn:se:uu:diva-111075 (URN)10.1016/j.leukres.2009.06.006 (DOI)000274529600013 ()19573916 (PubMedID)
    Tillgänglig från: 2009-12-02 Skapad: 2009-12-02 Senast uppdaterad: 2017-12-12Bibliografiskt granskad
    4. TP53 Mutations are infrequent in newly diagnosed chronic lymphocytic leukemia
    Öppna denna publikation i ny flik eller fönster >>TP53 Mutations are infrequent in newly diagnosed chronic lymphocytic leukemia
    Visa övriga...
    2011 (Engelska)Ingår i: Leukemia research: a Forum for Studies on Leukemia and Normal Hemopoiesis, ISSN 0145-2126, E-ISSN 1873-5835, Vol. 35, nr 2, s. 272-274Artikel i tidskrift (Refereegranskat) Published
    Abstract [en]

    TP53 mutations in the absence of 17p-deletion correlate with rapid disease progression and poor survival in chronic lymphocytic leukemia (CLL). Herein, we determined the TP53 mutation frequency in 268 newly diagnosed CLL patients from a population-based material. Overall, we detected TP53 mutations in 3.7% of patients (n= 10), where 7/10 cases showed a concomitant 17p-deletion, confirming the high prevalence of TP53 mutation in 17p-deleted patients. Only 3 (1.1%) of the newly diagnosed patients in our cohort thereby carried TP53 mutations without 17p-deletion, a frequency that is much lower than previous reports on referral cohorts (3-6%). Our findings imply that TP53 mutations are rare at CLL onset and instead may arise during disease progression.

    Nyckelord
    Chronic lymphocytic leukemia, TP53 mutation, 17p-deletion, overall survival, time to treatment
    Nationell ämneskategori
    Medicin och hälsovetenskap
    Forskningsämne
    Medicinsk genetik; Molekylär genetik; Molekylärbiologi
    Identifikatorer
    urn:nbn:se:uu:diva-115555 (URN)10.1016/j.leukres.2010.08.023 (DOI)000286460200024 ()20870288 (PubMedID)
    Tillgänglig från: 2010-02-17 Skapad: 2010-02-17 Senast uppdaterad: 2017-12-12Bibliografiskt granskad
  • 3.
    Zainuddin, Norafiza
    et al.
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi.
    Berglund, Mattias
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi.
    Wanders, Alkwin
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för genetik och patologi, Molekylär och morfologisk patologi.
    Ren, Zhi-Ping
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för genetik och patologi.
    Amini, Rose-Marie
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för genetik och patologi, Molekylär och morfologisk patologi.
    Lindell, Monica
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för patologi.
    Kanduri, Meena
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för genetik och patologi, Hematologi och immunologi.
    Roos, Göran
    Department of Medical Biosciences, Pathology, Umeå University, Umeå.
    Rosenquist, Richard
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för genetik och patologi, Hematologi och immunologi.
    Enblad, Gunilla
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi, Enheten för onkologi.
    TP53 mutations predict for poor survival in de novo diffuse large B-cell lymphoma of germinal center subtype2009Ingår i: Leukemia research: a Forum for Studies on Leukemia and Normal Hemopoiesis, ISSN 0145-2126, E-ISSN 1873-5835, Vol. 33, nr 1, s. 60-66Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Presence of TP53 mutations has been associated with poor prognosis in diffuse large B-cell lymphoma (DLBCL), although this has remained controversial. The TP53 codon 72 polymorphism has shown negative impact on cancer survival, but this has not been analyzed in DLBCL. Furthermore, the MDM2 SNP309 has been associated with earlier age of onset in DLBCL. Here, we investigated the clinical impact of TP53 mutations, MDM2 SNP309 and TP53 codon 72 polymorphisms on survival in DLBCL of germinal center (GC) and non-GC subtypes. Thirteen of the 102 (12.7%) patients displayed TP53 mutations. Overall, TP53 mutations had a significant effect on lymphoma-specific survival (LSS, P=0.009) and progression-free survival (PFS, P=0.028). In particular, inferior survival was observed in TP53-mutated DLBCLs of GC subtype (LSS, P=0.002 and PFS, P=0.006). Neither MDM2 SNP309 nor the TP53 codon 72 polymorphism had an impact on age of onset or survival. Altogether, our data suggests that TP53 mutations are associated with poor outcome in GC-DLBCL patients.

  • 4.
    Zainuddin, Norafiza
    et al.
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi.
    Kanduri, Meena
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för genetik och patologi.
    Berglund, Mattias
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi.
    Lindell, Monica
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för patologi.
    Amini, Rose-Marie
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för genetik och patologi.
    Roos, Göran
    Department of Medical Biosciences, Pathology, Umeå University, Umeå.
    Sundström, Christer
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för genetik och patologi.
    Enblad, Gunilla
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi.
    Rosenquist, Richard
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för genetik och patologi.
    Quantitative evaluation of p16INK4a promoter methylation using pyrosequencing in de novo diffuse large B-cell lymphoma2011Ingår i: Leukemia research: a Forum for Studies on Leukemia and Normal Hemopoiesis, ISSN 0145-2126, E-ISSN 1873-5835, Vol. 35, nr 4, s. 438-443Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The p16INK4a tumor suppressor gene can be inactivated by a variety of events including promoter hypermethylation. In diffuse large B-cell lymphoma (DLBCL), p16INK4a methylation has been associated with advanced disease stage and higher IPI. The prognostic impact of p16INK4a methylation in DLBCL remains unclear; however, it has been suggested to correlate with inferior outcome. To further investigate the clinical impact of p16INK4a methylation in DLBCL, promoter methylation of this gene was assessed quantitatively by pyrosequencing. Forty-two of 113 (37%) DLBCL patients with methylation level above 5% were categorized as methylated and subsequently divided into low, intermediate and high methylation categories. Overall, no association was shown between the extent of p16INK4a methylation and patients’ clinical characteristics, except disease stage (P=0.049). Moreover, we could not reveal any impact of p16INK4a methylation on lymphoma-specific survival. Although >25% of p16INK4a methylation correlated with a better progression-free survival (P=0.048), the significance of this finding, if any, needs to be further investigated. In conclusion, our finding questions the role of p16INK4a promoter methylation as a negative prognostic factor in DLBCL.

  • 5.
    Zainuddin, Norafiza
    et al.
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi, Enheten för onkologi.
    Murray, Fiona
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för genetik och patologi, Hematologi och immunologi.
    Kanduri, Meena
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för genetik och patologi, Hematologi och immunologi.
    Gunnarsson, Rebeqa
    Department of Laboratory Medicine, Stem Cell Center, Hematology and Transplantation, Lund University, Lund.
    Smedby, Karin Ekström
    Department of Medicine, Clinical Epidemiology Unit, Karolinska Institutet, Stockholm.
    Enblad, Gunilla
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för onkologi, radiologi och klinisk immunologi, Enheten för onkologi.
    Jurlander, Jesper
    Department of Hematology, Leukemia Laboratory, Rigshospitalet, Copenhagen, Denmark.
    Juliusson, Gunnar
    Department of Laboratory Medicine, Stem Cell Center, Hematology and Transplantation, Lund University, Lund.
    Rosenquist, Richard
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för genetik och patologi, Hematologi och immunologi.
    TP53 Mutations are infrequent in newly diagnosed chronic lymphocytic leukemia2011Ingår i: Leukemia research: a Forum for Studies on Leukemia and Normal Hemopoiesis, ISSN 0145-2126, E-ISSN 1873-5835, Vol. 35, nr 2, s. 272-274Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    TP53 mutations in the absence of 17p-deletion correlate with rapid disease progression and poor survival in chronic lymphocytic leukemia (CLL). Herein, we determined the TP53 mutation frequency in 268 newly diagnosed CLL patients from a population-based material. Overall, we detected TP53 mutations in 3.7% of patients (n= 10), where 7/10 cases showed a concomitant 17p-deletion, confirming the high prevalence of TP53 mutation in 17p-deleted patients. Only 3 (1.1%) of the newly diagnosed patients in our cohort thereby carried TP53 mutations without 17p-deletion, a frequency that is much lower than previous reports on referral cohorts (3-6%). Our findings imply that TP53 mutations are rare at CLL onset and instead may arise during disease progression.

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