Clinical characteristics of patients with colorectal cancer with double somatic mismatch repair mutations compared with Lynch syndrome
Background Patients with colorectal cancer (CRC) with mismatch repair-deficient (dMMR) tumours without MLH1 methylation or germline MMR pathogenic variants (PV) were previously thought to have Lynch syndrome (LS). It is now appreciated that they can have double somatic (DS) MMR PVs. We explored the...
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fthighwire:oai:open-archive.highwire.org:jmedgenet:56/7/462 2023-05-15T16:48:42+02:00 Clinical characteristics of patients with colorectal cancer with double somatic mismatch repair mutations compared with Lynch syndrome Pearlman, Rachel Haraldsdottir, Sigurdis de la Chapelle, Albert Jonasson, Jon G Liyanarachchi, Sandya Frankel, Wendy L Rafnar, Thorunn Stefansson, Kari Pritchard, Colin C Hampel, Heather 2019-07-01 00:00:00.0 text/html http://jmg.bmj.com/cgi/content/short/56/7/462 https://doi.org/10.1136/jmedgenet-2018-105698 en eng BMJ Publishing Group Ltd http://jmg.bmj.com/cgi/content/short/56/7/462 http://dx.doi.org/10.1136/jmedgenet-2018-105698 Copyright (C) 2019, BMJ Publishing Group Ltd Cancer genetics TEXT 2019 fthighwire https://doi.org/10.1136/jmedgenet-2018-105698 2019-10-03T17:13:07Z Background Patients with colorectal cancer (CRC) with mismatch repair-deficient (dMMR) tumours without MLH1 methylation or germline MMR pathogenic variants (PV) were previously thought to have Lynch syndrome (LS). It is now appreciated that they can have double somatic (DS) MMR PVs. We explored the clinical characteristics between patients with DS tumours and LS in two population-based cohorts. Methods We included patients with CRC from Ohio 2013–2016 and Iceland 2000–2009. All had microsatellite instability testing and/or immunohistochemistry (IHC) of MMR proteins, and MLH1 methylation testing when indicated. Germline next-generation sequencing was performed for all with dMMR tumours; tumour sequencing followed for patients with unexplained dMMR. Clinical characteristics of DS patients and patients with LS were compared. Results Of the 232 and 51 patients with non-methylated dMMR tumours in the Ohio and Iceland cohorts, respectively, 57.8% (n=134) and 45.1% (n=23) had LS, 32.8% (n=76) and 31.4% (n=16) had DS PVs, 6% (n=14) and 9.8% (n=5) were unexplained and 4.3% (n=10) and 13.7% (n=7) had incorrect IHC. Age of diagnosis for DS patients was older than patients with LS (p=3.73×10−4) in the two cohorts. Patients with LS were more likely to meet Amsterdam II criteria (OR=15.81, p=8.47×10−6) and have multiple LS-associated tumours (OR=6.67, p=3.31×10−5). Absence of MLH1/PMS2 was predictive of DS PVs; isolated MSH6 and PMS2 absence was predictive of LS in both cohorts. Conclusions Individuals with LS are 15× more likely to meet Amsterdam II criteria and >5× more likely to have multiple cancers as compared with those with DS tumours. Furthermore, isolated loss of MSH6 or PMS2 protein predicts LS. Text Iceland HighWire Press (Stanford University) Lynch ENVELOPE(-57.683,-57.683,-63.783,-63.783) Journal of Medical Genetics 56 7 462 470 |
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Open Polar |
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HighWire Press (Stanford University) |
op_collection_id |
fthighwire |
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English |
topic |
Cancer genetics |
spellingShingle |
Cancer genetics Pearlman, Rachel Haraldsdottir, Sigurdis de la Chapelle, Albert Jonasson, Jon G Liyanarachchi, Sandya Frankel, Wendy L Rafnar, Thorunn Stefansson, Kari Pritchard, Colin C Hampel, Heather Clinical characteristics of patients with colorectal cancer with double somatic mismatch repair mutations compared with Lynch syndrome |
topic_facet |
Cancer genetics |
description |
Background Patients with colorectal cancer (CRC) with mismatch repair-deficient (dMMR) tumours without MLH1 methylation or germline MMR pathogenic variants (PV) were previously thought to have Lynch syndrome (LS). It is now appreciated that they can have double somatic (DS) MMR PVs. We explored the clinical characteristics between patients with DS tumours and LS in two population-based cohorts. Methods We included patients with CRC from Ohio 2013–2016 and Iceland 2000–2009. All had microsatellite instability testing and/or immunohistochemistry (IHC) of MMR proteins, and MLH1 methylation testing when indicated. Germline next-generation sequencing was performed for all with dMMR tumours; tumour sequencing followed for patients with unexplained dMMR. Clinical characteristics of DS patients and patients with LS were compared. Results Of the 232 and 51 patients with non-methylated dMMR tumours in the Ohio and Iceland cohorts, respectively, 57.8% (n=134) and 45.1% (n=23) had LS, 32.8% (n=76) and 31.4% (n=16) had DS PVs, 6% (n=14) and 9.8% (n=5) were unexplained and 4.3% (n=10) and 13.7% (n=7) had incorrect IHC. Age of diagnosis for DS patients was older than patients with LS (p=3.73×10−4) in the two cohorts. Patients with LS were more likely to meet Amsterdam II criteria (OR=15.81, p=8.47×10−6) and have multiple LS-associated tumours (OR=6.67, p=3.31×10−5). Absence of MLH1/PMS2 was predictive of DS PVs; isolated MSH6 and PMS2 absence was predictive of LS in both cohorts. Conclusions Individuals with LS are 15× more likely to meet Amsterdam II criteria and >5× more likely to have multiple cancers as compared with those with DS tumours. Furthermore, isolated loss of MSH6 or PMS2 protein predicts LS. |
format |
Text |
author |
Pearlman, Rachel Haraldsdottir, Sigurdis de la Chapelle, Albert Jonasson, Jon G Liyanarachchi, Sandya Frankel, Wendy L Rafnar, Thorunn Stefansson, Kari Pritchard, Colin C Hampel, Heather |
author_facet |
Pearlman, Rachel Haraldsdottir, Sigurdis de la Chapelle, Albert Jonasson, Jon G Liyanarachchi, Sandya Frankel, Wendy L Rafnar, Thorunn Stefansson, Kari Pritchard, Colin C Hampel, Heather |
author_sort |
Pearlman, Rachel |
title |
Clinical characteristics of patients with colorectal cancer with double somatic mismatch repair mutations compared with Lynch syndrome |
title_short |
Clinical characteristics of patients with colorectal cancer with double somatic mismatch repair mutations compared with Lynch syndrome |
title_full |
Clinical characteristics of patients with colorectal cancer with double somatic mismatch repair mutations compared with Lynch syndrome |
title_fullStr |
Clinical characteristics of patients with colorectal cancer with double somatic mismatch repair mutations compared with Lynch syndrome |
title_full_unstemmed |
Clinical characteristics of patients with colorectal cancer with double somatic mismatch repair mutations compared with Lynch syndrome |
title_sort |
clinical characteristics of patients with colorectal cancer with double somatic mismatch repair mutations compared with lynch syndrome |
publisher |
BMJ Publishing Group Ltd |
publishDate |
2019 |
url |
http://jmg.bmj.com/cgi/content/short/56/7/462 https://doi.org/10.1136/jmedgenet-2018-105698 |
long_lat |
ENVELOPE(-57.683,-57.683,-63.783,-63.783) |
geographic |
Lynch |
geographic_facet |
Lynch |
genre |
Iceland |
genre_facet |
Iceland |
op_relation |
http://jmg.bmj.com/cgi/content/short/56/7/462 http://dx.doi.org/10.1136/jmedgenet-2018-105698 |
op_rights |
Copyright (C) 2019, BMJ Publishing Group Ltd |
op_doi |
https://doi.org/10.1136/jmedgenet-2018-105698 |
container_title |
Journal of Medical Genetics |
container_volume |
56 |
container_issue |
7 |
container_start_page |
462 |
op_container_end_page |
470 |
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1766038789031985152 |