Abstract:
INTRODUCTION:Breast carcinoma is the most common cancer in women, but its incidence is not increased in Lynch syndrome (LS) and studies on DNA mismatch repair deficiency (MMR) in LS-associated breast cancers have arrived at conflicting results. This study aimed to settle the question as to whether breast carcinoma belongs to the LS tumor spectrum. METHODS:MMR status and epigenetic profiles were determined for all available breast carcinomas identified among 200 LS families from a nation-wide registry (23 tumors from mutation carriers and 18 from non-carriers). Sporadic breast carcinomas (n = 49) and other cancers (n = 105) from MMR gene mutation carriers were studied for comparison. RESULTS:The proportion of breast carcinomas that were MMR-deficient based on absent MMR protein, presence of microsatellite instability, or both was significantly (P = 0.00016) higher among breast carcinomas from mutation carriers (13/20, 65%) compared to non-carriers (0/14, 0%). While the average age at breast carcinoma diagnosis was similar in carriers (56 years) and non-carriers (54 years), it was lower for MMR-deficient versus proficient tumors in mutation carriers (53 years versus 61 years, P = 0.027). Among mutation carriers, absent MMR protein was less frequent in breast carcinoma (65%) than in any of seven other tumor types studied (75% to 100%). Tumor suppressor promoter methylation patterns were organ-specific and similar between breast carcinomas from mutation carriers and non-carriers. CONCLUSIONS:Breast carcinoma from MMR gene mutation carriers resembles common breast carcinoma in many respects (for example, general clinicopathological and epigenetic profiles). MMR status makes a distinction: over half are MMR-deficient typical of LS spectrum tumors, while the remaining subset which is MMR-proficient may develop differently. The results are important for appropriate surveillance in mutation carriers and may be relevant for LS diagnosis in selected cases.
journal_name
Breast Cancer Resjournal_title
Breast cancer research : BCRauthors
Lotsari JE,Gylling A,Abdel-Rahman WM,Nieminen TT,Aittomäki K,Friman M,Pitkänen R,Aarnio M,Järvinen HJ,Mecklin JP,Kuopio T,Peltomäki Pdoi
10.1186/bcr3205subject
Has Abstractpub_date
2012-06-12 00:00:00pages
R90issue
3eissn
1465-5411issn
1465-542Xpii
bcr3205journal_volume
14pub_type
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journal_title:Breast cancer research : BCR
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journal_title:Breast cancer research : BCR
pub_type: 杂志文章
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