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The presence of BRAF point mutation in adult papillary thyroid carcinomas from atomic bomb survivors correlates with radiation dose
Author(s) -
Takahashi Keiko,
Eguchi Hidetaka,
Arihiro Koji,
Ito Reiko,
Koyama Kojiro,
Soda Midori,
Cologne John,
Hayashi Yuzo,
Nakata Yoshihiro,
Nakachi Kei,
Hamatani Kiyohiro
Publication year - 2007
Publication title -
molecular carcinogenesis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.254
H-Index - 97
eISSN - 1098-2744
pISSN - 0899-1987
DOI - 10.1002/mc.20277
Subject(s) - thyroid carcinoma , mutation , biology , mutation frequency , v600e , papillary thyroid cancer , cancer research , point mutation , thyroid , thyroid cancer , mutation rate , pathological , medicine , oncology , gastroenterology , pathology , gene , genetics
Abstract In papillary thyroid carcinogenesis, the constitutively activated mitogen‐activated protein (MAP) kinase signaling pathway caused by a genetic alteration such as RET / PTC rearrangement or mutation of RAS and BRAF genes, is thought to be a major early event. Among these, the recently identified BRAF V600E mutation has been found at high frequency in adult patients with papillary thyroid carcinoma (PTC). However, the association between this mutation and radiation exposure in adult PTC is still unknown. In this study, we examined the BRAF V600E mutation in 64 PTCs among adult atomic bomb survivors in Hiroshima, Japan, comprising 17 nonexposed (0 mGy) and 47 exposed patients who developed the carcinoma after the bombing, and assessed the association of BRAF V600E mutation with clinico‐pathological and epidemiological variables. The median radiation dose in PTCs with the BRAF V600E mutation was significantly lower than that without the mutation (18.5 vs.156.9 mGy, Wilcoxon rank‐sum test, P = 0.022). A significant difference was found in the median latency period (years elapsed from atomic bombing to diagnosis) between exposed patients with and without BRAF V600E mutation (29 vs. 21 yr, Wilcoxon rank‐sum test, P = 0.014). These findings were further confirmed by logistic regression analysis with BRAF V600E mutation status as a dependent variable and taking into account possible interactions between the variables. We found that the log‐transformed radiation dose and latency period were independently associated with the BRAF V600E mutation ( P = 0.039 and P = 0.010, respectively). These results suggest that involvement of BRAF mutation in thyroid carcinogenesis in exposed people may differ from that in the nonexposed people. © 2006 Wiley‐Liss, Inc.