liu.seSearch for publications in DiVA
Endre søk
Link to record
Permanent link

Direct link
BETA
Willander, Kerstin
Publikasjoner (10 av 12) Visa alla publikasjoner
Mosrati, M. A., Willander, K., Jakobsen Falk, I., Hermanson, M., Höglund, M., Stockelberg, D., . . . Söderkvist, P. (2015). Association between TERT promoter polymorphisms and acute myeloid leukemia risk and prognosis. OncoTarget, 6(28), 25109-25120
Åpne denne publikasjonen i ny fane eller vindu >>Association between TERT promoter polymorphisms and acute myeloid leukemia risk and prognosis
Vise andre…
2015 (engelsk)Inngår i: OncoTarget, ISSN 1949-2553, E-ISSN 1949-2553, Vol. 6, nr 28, s. 25109-25120Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Telomerase reverse transcriptase gene (TERT) promoter mutations are identified in many malignancies but not in hematological malignancies. Here we analyzed TERT and protection of telomeres 1 gene (POT1) mutations, and four different TERT SNVs in 226 acute myeloid leukemia (AML) patients and 806 healthy individuals in a case referent design, where also overall survival was assessed. A significant association for increased risk of AML was found for TERT SNVs, rs2853669 (OR = 2.45, p = 0.00015) and rs2736100 (OR = 1.5, p = 0.03). The overall survival for patients with CC genotype of rs2853669 was significantly shorter compared to those with TT or TC genotypes (p = 0.036 and 0.029 respectively). The influence of TERT rs2853669 CC on survival was confirmed in multivariable Cox regression analysis as an independent risk biomarker in addition to high risk group, higher age and treatment. No hot spot TERT promoter mutations at -228Cgreater thanT or -250Cgreater thanT or POT1 mutations could be identified in this AML cohort. We show that rs2853669 CC may be a risk factor for the development of AML that may also be used as a prognostic marker to identify high risk normal karyotype -AML (NK-AML) patients, for treatment guidance.

sted, utgiver, år, opplag, sider
Albany, NY, United States: Impact Journals LLC, 2015
Emneord
TERT; SNV; AML; prognostic markers
HSV kategori
Identifikatorer
urn:nbn:se:liu:diva-122667 (URN)10.18632/oncotarget.4668 (DOI)000363160100047 ()
Merknad

Funding Agencies|Swedish Research Council; Swedish Cancer Society; County Council of Ostergotland; AFA Insurance; FORSS

Tilgjengelig fra: 2015-11-16 Laget: 2015-11-13 Sist oppdatert: 2017-12-01bibliografisk kontrollert
Jakobsen Falk, I., Willander, K., Chaireti, R., Lund, J., Nahi, H., Hermanson, M., . . . Söderkvist, P. (2015). TP53 mutations and MDM2(SNP309) identify subgroups of AML patients with impaired outcome. European Journal of Haematology, 94(4), 355-362
Åpne denne publikasjonen i ny fane eller vindu >>TP53 mutations and MDM2(SNP309) identify subgroups of AML patients with impaired outcome
Vise andre…
2015 (engelsk)Inngår i: European Journal of Haematology, ISSN 0902-4441, E-ISSN 1600-0609, Vol. 94, nr 4, s. 355-362Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

BackgroundTP53 is commonly mutated in several cancers and confers treatment resistance and poor prognosis. Altered expression of mouse double minute 2 (MDM2), a negative regulator of p53, may also attenuate normal p53 signaling, thereby enhancing tumor transformation and resistance to apoptosis. The single nucleotide polymorphism (SNP) 309 has been reported to increase MDM2 expression and impair normal p53 response. Experimental designWe investigated the frequency and impact of TP53 mutations (TP53mut) and MDM2(SNP309) on treatment outcome and overall survival (OS) in 189 Swedish acute myeloid leukemia patients. The genetic analyses were performed using SSCA and direct sequencing (for mutations in exon 5-8 of TP53) and Pyrosequencing (for the MDM2(SNP309)). ResultsWe found a high frequency (22%) of TP53mut in patients with cytogenetic aberrations, with association to high-risk cytogenetics (Pless than0.001). TP53mut patients had lower response rates (22% compared with 76% CR in TP53 wild-type (wt) patients, Pless than0.001) and reduced OS (2 and 16months, respectively, Pless than0.001). In TP53wt patients with high or intermediate risk cytogenetic aberrations, the MDM2(SNP309) conferred an impaired outcome, with patients carrying the alternative G-allele having shorter OS compared with T/T patients (median 9 vs. 50months, P=0.020). ConclusionsOur results show that TP53mut analysis and MDM2(SNP309) genotyping may be useful tools for prognostication, risk stratification, and selection of patients most likely to benefit from new drugs targeting the p53 signaling pathway.

sted, utgiver, år, opplag, sider
Wiley: 12 months, 2015
Emneord
acute myeloid leukemia; TP53; MDM2; SNP309; prognostic markers
HSV kategori
Identifikatorer
urn:nbn:se:liu:diva-117209 (URN)10.1111/ejh.12438 (DOI)000351628000011 ()25156865 (PubMedID)
Merknad

Funding Agencies|County Council of Ostergotland; AFA Insurance; Swedish Cancer Society; Stockholm Cancer Society; Karolinska Institutet; Swedish Research Council

Tilgjengelig fra: 2015-04-23 Laget: 2015-04-21 Sist oppdatert: 2017-12-04
Benner, A., Mansouri, L., Rossi, D., Majid, A., Willander, K., Parker, A., . . . Zenz, T. (2014). MDM2 promotor polymorphism and disease characteristics in chronic lymphocytic leukemia: results of an individual patient data-based meta-analysis. Haematologica (online), 99(8), 1285-1291
Åpne denne publikasjonen i ny fane eller vindu >>MDM2 promotor polymorphism and disease characteristics in chronic lymphocytic leukemia: results of an individual patient data-based meta-analysis
Vise andre…
2014 (engelsk)Inngår i: Haematologica (online), ISSN 0390-6078, E-ISSN 1592-8721, Vol. 99, nr 8, s. 1285-1291Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

A number of single nucleotide polymorphisms have been associated with disease predisposition in chronic lymphocytic leukemia. A single nucleotide polymorphism in the MDM2 promotor region, MDM2SNP309, was shown to soothe the p53 pathway. In the current study, we aimed to clarify the effect of the MDM2SNP309 on chronic lymphocytic leukemia characteristics and outcome. We performed a meta-analysis of data from 2598 individual patients from 10 different cohorts. Patients data and genetic analysis for MDM2SNP309 genotype, immunoglobulin heavy chain variable region mutation status and fluorescence in situ hybridization results were collected. There were no differences in overall survival based on the polymorphism (log rank test, stratified by study cohort; P=0.76; GG genotype: cohort-adjusted median overall survival of 151 months; TG: 153 months; TT: 149 months). In a multivariable Cox proportional hazards regression analysis, advanced age, male sex and unmutated immunoglobulin heavy chain variable region genes were associated with inferior survival, but not the MDM2 genotype. The MDM2SNP309 is unlikely to influence disease characteristics and prognosis in chronic lymphocytic leukemia. Studies investigating the impact of individual single nucleotide polymorphisms on prognosis are often controversial. This may be due to selection bias and small sample size. A meta-analysis based on individual patient data provides a reasonable strategy for prognostic factor analyses in the case of small individual studies. Individual patient data-based meta-analysis can, therefore, be a powerful tool to assess genetic risk factors in the absence of large studies.

sted, utgiver, år, opplag, sider
Ferrata Storti Foundation, 2014
HSV kategori
Identifikatorer
urn:nbn:se:liu:diva-111760 (URN)10.3324/haematol.2013.101170 (DOI)000342834300011 ()25082786 (PubMedID)
Tilgjengelig fra: 2014-10-31 Laget: 2014-10-31 Sist oppdatert: 2017-12-05
Willander, K. (2014). Molecular genetic studies on Chronic Lymphocytic Leukemia and Acute Myeloid Leukemia - with focus on prognostic markers. (Doctoral dissertation). Linköping: Linköping University Electronic Press
Åpne denne publikasjonen i ny fane eller vindu >>Molecular genetic studies on Chronic Lymphocytic Leukemia and Acute Myeloid Leukemia - with focus on prognostic markers
2014 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

The present thesis is focused on the prognostic value of genetic variations and alterations in the initiation and development of chronic lymphocytic leukemia (CLL) and acute myeloid leukemia (AML) patients. Several prognostic markers based on genetic or chromosomal aberrations are today used in clinic in these heterogeneous diseases. Novel biomarkers have been identified through next generation sequencing techniques and some of them may be useful as prognostic markers in clinical diagnostic. In papers I-IV we have investigated some of this markers in CLL and AML tumor cells.

In papers I and III we investigated the prognostic value of the MDM2 SNP309 in relation to the presence of TP53 mutations in tumor cells from CLL and AML patients. The SNP309 G-allele was associated with a shorter overall survival in TP53 wildtype CLL and non-normal karyotype AML patients. Mutations in the TP53 gene were found in 6.2% in CLL and 21.7% in AML and were always associated with adverse overall survival. This was most significant observed among the AML patients, where the three year survival was zero.

In paper II we investigated mutations in NOTCH1 and NOTCH2 as prognostic biomarkers in CLL. Notch1 and Notch2 play critical roles in lineage differentiation of white blood cells. We found mutation only in NOTCH1 in a frequency of 6.7% and our analysis revealed a shorter overall survival for these. NOTCH1 mutations were almost mutually exclusive with TP53 mutations and represented together 12.9% in CLL patients, and they may both be strong prognostic biomarkers in CLL.

In paper IV we studied mutations in the tricarboxylic acid cycle. Metabolic disturbances in cancer cells have been known for many years, but recently mechanistic explanations have been identified. Hot spot mutations in IDH1/2 genes, result in neomorphic enzyme activities that results in global hypermethylation of the cancer cell genome. We found mutations in 21% of the AML patients. Among the CN-AML patients there is a lack of prognostic markers and in this subgroup we found patients with IDH2 mutations to have a shorter overall survival (3 vs. 21 months (p=0.009) for mutated and wild-type patients, respectively). Additionally, we also studied a SNP in the IDH1 gene, and both the IDH2 mutations and the SNP showed to have a potential as a new prognostic markers in CN-AML.

In summary, the results in papers I-IV have a potential to function as novel prognostic biomarkers in the clinic for therapeutic considerations and may also be targets for novel drugs for CLL and AML patients.

sted, utgiver, år, opplag, sider
Linköping: Linköping University Electronic Press, 2014. s. 59
Serie
Linköping University Medical Dissertations, ISSN 0345-0082 ; 1393
HSV kategori
Identifikatorer
urn:nbn:se:liu:diva-104951 (URN)10.3384/diss.diva-104951 (DOI)978-91-7519-421-9 (ISBN)
Disputas
2014-03-26, Nils-Holgersalen, Campus US, Linköpings universitet, Linköping, 09:00 (svensk)
Opponent
Veileder
Tilgjengelig fra: 2014-03-04 Laget: 2014-03-04 Sist oppdatert: 2015-06-05bibliografisk kontrollert
Willander, K., Jakobsen Falk, I., Chaireti, R., Paul, E., Monica, H., Gréen, H., . . . Söderkvist, P. (2014). Mutations in the isocitrate dehydrogenase 1/2 genes and IDH1 SNP 105C>T have a prognostic value in acute myeloid leukemia. Biomarker Research, 2(18)
Åpne denne publikasjonen i ny fane eller vindu >>Mutations in the isocitrate dehydrogenase 1/2 genes and IDH1 SNP 105C>T have a prognostic value in acute myeloid leukemia
Vise andre…
2014 (engelsk)Inngår i: Biomarker Research, ISSN 2050-7771, Vol. 2, nr 18Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The isocitrate dehydrogenase (IDH1/IDH2) genes are frequently mutated and reported to associate with poor prognosis in acute myeloid leukemia (AML). We have investigated the frequency and outcome of the acquired IDH1/IDH2 mutations and the IDH1 SNP  105C>T (rs11554137) in 207 unselected de novo AML patients. IDH1 codon 132 mutations were present in 7.7%, whereas IDH2 mutations were more frequent and mutations were identified in codon 140 and 172 in a frequency of 10.1% and 2.9%, respectively. The SNP 105C>T was present in 10.1% of the patients, similar to the normal population. A significantly reduced overall survival (OS) for patients carrying IDH2 codon 140 mutation compared with patients carrying wild-type IDH2 gene (p=0.009) was observed in the intermediate risk patient group with cytogenetically normal karyotype (CN-AML). Neither in the entire patient group nor subdivided in different risk groups, IDH1 mutations had any significance on OS compared to the wild-type IDH1 patients. A significant difference in OS between the heterozygous SNP variant and the homozygous wild-type was observed in the intermediate risk FLT3 negative CN-AML, (p=0.007). Our results indicate that IDH2 mutations and the IDH1 SNP 105C>T variant may represent a new subgroup for risk stratification and may indicate new treatment options.

Emneord
AML, IDH1, IDH2, SNP, prognostic markers
HSV kategori
Identifikatorer
urn:nbn:se:liu:diva-104949 (URN)10.1186/2050-7771-2-18 (DOI)
Tilgjengelig fra: 2014-03-04 Laget: 2014-03-04 Sist oppdatert: 2018-12-19bibliografisk kontrollert
Jakobsen Falk, I., Willander, K., Chaireti, R., Lund, J., Monica, H., Gréen, H., . . . Söderkvist, P. (2014). TP53 mutations identify a subgroup of AML patients with dramatically impaired outcome.
Åpne denne publikasjonen i ny fane eller vindu >>TP53 mutations identify a subgroup of AML patients with dramatically impaired outcome
Vise andre…
2014 (engelsk)Manuskript (preprint) (Annet vitenskapelig)
Abstract [en]

TP53 is commonly mutated in several cancers and confers treatment resistance and poor prognosis. Altered expression of MDM2 (mouse double minute 2), a negative regulator of p53, may also attenuate normal p53 signaling, thereby enhancing tumor transformation and resistance to apoptosis. The single nucleotide polymorphism (SNP) 309 has been reported to increase MDM2 expression and impair normal p53 response. We investigated the frequency and impact of TP53 mutations (TP53mut) and MDM2SNP309 on treatment outcome and overall survival (OS) in 207 Swedish AML patients. We found a high frequency (22%) of TP53mut in patients with cytogenetic aberrations, with strong association to high risk cytogenetics (p<0.001). TP53mut patients had lower response rates compared to TP53 wild-type (wt) patients (22% and 76% CR, respectively, p<0.001) and reduced OS (5 and 21 months, respectively, p<0.001). In TP53wt patients with abnormal karyotype, the MDM2SNP309 conferred an impaired outcome, with patients carrying the alternative G allele  having shorter OS compared to T/T patients (13 and 29 months, p=0.031). In conclusion, our results show that TP53mut analysis as well as MDM2SNP309 genotyping may be useful tools for prognostication, risk stratification and selection of patients most likely to benefit from new drugs targeting the p53 signaling pathway.

Emneord
AML, TP53, MDM2, SNP309, prognostic markers
HSV kategori
Identifikatorer
urn:nbn:se:liu:diva-104948 (URN)
Tilgjengelig fra: 2014-03-04 Laget: 2014-03-04 Sist oppdatert: 2015-04-14bibliografisk kontrollert
Willander, K., Kumar Dutta, R., Ungerbäck, J., Gunnarsson, R., Juliusson, G., Fredrikson, M., . . . Söderkvist, P. (2013). NOTCH1 mutations influence survival in chronic lymphocytic leukemia patients. BMC Cancer, 13
Åpne denne publikasjonen i ny fane eller vindu >>NOTCH1 mutations influence survival in chronic lymphocytic leukemia patients
Vise andre…
2013 (engelsk)Inngår i: BMC Cancer, ISSN 1471-2407, E-ISSN 1471-2407, Vol. 13Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Background

NOTCH1 PEST domain mutations in chronic lymphocytic leukemia have recently been shown to be of prognostic relevance. Both NOTCH1 and NOTCH2 are constitutively activated in B-cell CLL but not expressed in normal B cells and may be involved in survival and resistance to apoptosis in CLL. We screened for mutations in different parts of both NOTCH1 and NOTCH2 genes and related the changes to survival and other known risk factors.

Methods

In a cohort of 209 CLL patients, we used single strand conformation analysis to determine which of the samples carrying the NOTCH mutations and direct dideoxy sequencing was used to determine the exact nucleotide changes. Kaplan-Meier curves and log rank test were used to determine overall survival for NOTCH1 mutated cases and Cox regression analysis was used to calculate hazardous ratios.

Results

In the present study, we found NOTCH1 PEST domain mutations in 6.7% of the cases. A shorter overall survival was found in patients with NOTCH1 mutations compared to wildtype (p = 0.049). Further, we also examined the extracellular and the heterodimerisation domains of the NOTCH1 gene and the PEST domain and heterodimerisation domain of the NOTCH2 gene, but no mutations were found in these regions. NOTCH1 mutations were most commonly observed in patients with unmutated IGHV gene (10/14), and associated with a more aggressive disease course. In addition, NOTCH1 mutations were almost mutually exclusive with TP53 mutations. In the combined group of NOTCH1 (6.7%) or TP53 (6.2%) mutations, a significant difference in overall survival compared to the wildtype NOTCH1 and TP53 was found (p = 0.002).

Conclusions

Both NOTCH1 and TP53 mutations seem to be independent predictive markers for worse outcome in CLL-patients and this study emphasizes the contention that NOTCH1 mutations is a novel risk marker.

sted, utgiver, år, opplag, sider
BioMed Central, 2013
Emneord
Chronic lymphocytic leukemia; NOTCH1 mutations; TP53 mutations; Prognostic markers
HSV kategori
Identifikatorer
urn:nbn:se:liu:diva-96472 (URN)10.1186/1471-2407-13-274 (DOI)000319998800001 ()
Tilgjengelig fra: 2013-08-23 Laget: 2013-08-20 Sist oppdatert: 2017-12-06
Willander, K., Ungerbäck, J., Karlsson, K., Fredrikson, M., Söderkvist, P. & Linderholm, M. (2010). MDM2 SNP309 promoter polymorphism, an independent prognostic factor in chronic lymphocytic leukemia. European Journal of Haematology, 85(3), 251-256
Åpne denne publikasjonen i ny fane eller vindu >>MDM2 SNP309 promoter polymorphism, an independent prognostic factor in chronic lymphocytic leukemia
Vise andre…
2010 (engelsk)Inngår i: European Journal of Haematology, ISSN 0902-4441, E-ISSN 1600-0609, Vol. 85, nr 3, s. 251-256Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

BACKGROUND: The single nucleotide polymorphism SNP309 with a change from T to G in the promoter region of the MDM2 gene is shown to increase the MDM2 protein levels and attenuate the p53 levels and associates with disease progression in several tumors. OBJECTIVE: In this study, the role of the polymorphism was investigated with regard to the clinical outcome in B-cell chronic lymphocytic leukemia (B-CLL). PATIENTS: A total of 210 patients with B-CLL were followed for up to 19 yr. RESULTS: The overall survival (OS) of patients with at least one G-allele was significantly shorter when compared with those with two T-alleles (P = 0.024) with a more pronounced difference in patients below the median age. Age at onset of B-CLL was similar irrespective of MDM2 status. The presence of a G-allele in combination with TP53 mutations or unmutated IgVH gene status resulted in an additive risk of death. CONCLUSION: In this report, with a high proportion of B-CLL patients with an advanced Binet stage and with an unmutated IgVH gene, MDM2 SNP309 was found to be independently associated with OS. The survival difference was more pronounced in younger patients.

HSV kategori
Identifikatorer
urn:nbn:se:liu:diva-58806 (URN)10.1111/j.1600-0609.2010.01470.x (DOI)000280996400010 ()20491880 (PubMedID)
Tilgjengelig fra: 2010-08-27 Laget: 2010-08-27 Sist oppdatert: 2017-12-12
Lanemo Myhrinder, A., Hellqvist, E., Sidorova, E., Söderberg, A., Baxendale, H., Dahle, C., . . . Rosén, A. (2008). A new perspective: molecular motifs on oxidized LDL, apoptotic cells, and bacteria are targets for chronic lymphocytic leukemia antibodies. Blood, 111(7), 3838-3848
Åpne denne publikasjonen i ny fane eller vindu >>A new perspective: molecular motifs on oxidized LDL, apoptotic cells, and bacteria are targets for chronic lymphocytic leukemia antibodies
Vise andre…
2008 (engelsk)Inngår i: Blood, ISSN 0006-4971, E-ISSN 1528-0020, Vol. 111, nr 7, s. 3838-3848Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The restricted immunoglobulin (Ig) repertoire found in B-cell chronic lymphocytic leukemia (CLL) implies a role for antigen(s) in the leukemogenesis. The nature of the antigens has, however, not been characterized, although examples of autoantigens have been demonstrated. We have analyzed a panel of 28 CLL cell lines and primary cultures, producing monoclonal Ig with different Ig heavy-chain variable region gene usage and mutational status, including several complementarity determining region 3 homology subset members. Using mass-spectrometry, immunoassays, or protein macroarrays, we have discovered novel antigens binding to CLL Igs. These antigens included cytoskeletal proteins vimentin, filamin B, and cofilin-1, but also phosphorylcholine-containing antigens (eg, Streptococcus pneumoniae polysaccharides and oxidized low-density lipoprotein [oxLDL]). Additional new antigens identified were cardiolipin and proline-rich acidic protein-1. Remarkably, these antigens represent molecular motifs exposed on apoptotic cells/blebs and bacteria, and several CLL Igs bound to apoptotic Jurkat cells. In conclusion, these intriguing data, showing a limited target structure recognition, indicate that CD5+ CLL B cells are derived from a cell compartment that produces "natural antibodies," which may be instrumental in elimination and scavenging of apoptotic cells and pathogenic bacteria.

HSV kategori
Identifikatorer
urn:nbn:se:liu:diva-16339 (URN)10.1182/blood-2007-11-125450 (DOI)
Tilgjengelig fra: 2009-01-16 Laget: 2009-01-16 Sist oppdatert: 2017-12-14bibliografisk kontrollert
Eliasson, P., Andersson, P., Willander, K., Linderholm, M., Söderkvist, P. & Jönsson, J.-I. (2006). Letter: Absence of hot spot mutations of the PIK3CA gene in acute myeloid leukaemia [Letter to the editor]. European Journal of Haematology, 77(1), 86-87
Åpne denne publikasjonen i ny fane eller vindu >>Letter: Absence of hot spot mutations of the PIK3CA gene in acute myeloid leukaemia
Vise andre…
2006 (engelsk)Inngår i: European Journal of Haematology, ISSN 0902-4441, E-ISSN 1600-0609, Vol. 77, nr 1, s. 86-87Artikkel i tidsskrift, Letter (Annet vitenskapelig) Published
Abstract [en]

[No abstract available]

HSV kategori
Identifikatorer
urn:nbn:se:liu:diva-37786 (URN)10.1111/j.0902-4441.2006.t01-1-EJH2605.x (DOI)38625 (Lokal ID)38625 (Arkivnummer)38625 (OAI)
Tilgjengelig fra: 2009-10-10 Laget: 2009-10-10 Sist oppdatert: 2017-12-13bibliografisk kontrollert
Organisasjoner