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ÀþÀº Çѱ¹ÀÎ À¯¹æ¾Ï ȯÀÚ¿¡¼­ BRCA1/2 µ¹¿¬º¯ÀÌ¿Í È£¸£¸ó ¼ö¿ëü, HER-2 »óÅ¿¡ °üÇÑ ¿¬±¸ A Study on BRCA1/2 Mutations, Hormone Status and HER-2 Status in Korean Women with Early-onset Breast Cancer

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ÃÖµÎÈ£ ( Choi Doo-Ho ) 
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Áø¼Ò¿µ ( Jin So-Young ) 
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À̵¿È­ ( Lee Dong-Wha ) 
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±è¿ëÈ£ ( Kim Yong-Ho ) 
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Abstract

¸ñÀû: 40¼¼ ÀÌÇÏÀÇ ÀþÀº ¿©¼º À¯¹æ¾Ï ȯÀÚ´Â ³ªÀÌ µç ¿©¼º º¸´Ù BRCA1°ú BRCA2 ¹è¼±µ¹¿¬º¯ÀÌÀÇ ºóµµ°¡ »ó´ëÀûÀ¸·Î ³ô´Ù. À¯¹æ¾Ï °¡Á··ÂÀÌ Àְųª ÀþÀº ³ªÀÌ¿¡ À¯¹æ¾ÏÀ» Áø´Ü¹ÞÀº ¹éÀÎ ¿©¼ºµéÀÇ BRCA1/2 µ¹¿¬º¯ÀÌ ¾Ï¿¡ ´ëÇÑ ¿¬±¸¿¡¼­ ¸é¿ªÁ¶Á÷È­ÇÐÀûÀ¸·Î BRCA1/2 µ¹¿¬º¯ÀÌ À½¼ºÀÎ ¾Ï°ú ´Ù¸¥ Ư¼ºÀÌ ¹ß°ßµÇ¾ú´Ù. ÀÌ ¿¬±¸ÀÇ ¸ñÀûÀº À¯¹æ¾Ï °¡Á··Â°ú °ü°è¾øÀÌ ÀþÀº ³ªÀÌ¿¡ À¯¹æ¾ÏÀÌ ¹ß»ýÇÑ Çѱ¹ ¿©¼ºÀ» ´ë»óÀ¸·Î BRCA1/2 µ¹¿¬º¯ÀÌ À¯¹Â¿¡ µû¶ó, ±×¸®°í BRCA1°ú BRCA2 °¢°¢ÀÇ µ¹¿¬º¯ÀÌ¿¡ µû¶ó ¸é¿ªÁ¶Á÷È­ÇÐÀû Ư¼ºÀ¸·Î »óÈ£°£ÀÇ ±¸º°ÀÌ °¡´ÉÇÑÁö, ¸é¿ªÁ¶Á÷È­ÇÐÀû °Ë»ç·Î BRCA1/2 µ¹¿¬º¯ÀÌÀÇ °¡´É¼ºÀ» ¾Ë¾Æº¸´Â °ÍÀÌ °¡´ÉÇÑÁö¸¦ Á¶»çÇϴµ¥ ÀÖÀ¸¸ç BRCA¿Í °ü·ÃµÈ ¾ÏÀÇ ¿¹ÈÄÀÎÀڷμ­ÀÇ ¿ªÇÒµµ ºÐ¼®ÇÏ¿´´Ù.

´ë»ó ¹× ¹æ¹ý: BRCA1/2 °Ë»ç¸¦ ½ÃÇàÇÑ 40¼¼ ÀÌÇÏÀÇ Çѱ¹ÀÎ ÀþÀº ¿©¼º À¯¹æ¾Ï ȯÀÚÀÇ À¯¹æ¾Ï ¼ö¼ú ÈÄ º´¸®Á¶Á÷À» ã¾Æ¼­ Á¶Á÷¹Ì¼¼¹è¿­¹ýÀ¸·Î ½½¶óÀ̵带 ¸¸µé¾ú´Ù. ÀÌ °ËüµéÀÇ º´¸®Á¶Á÷, µî±Þ, ¸²ÇÁÀý ÀüÀÌ, T º´±â, ¿¡½ºÆ®·Î°Õ ¼ö¿ëü, ÇÁ·Î°Ô½ºÅ×·Ð ¼ö¿ëü ¹× HER-2 »óÅÂ¿Í BRCA1/2ÀÇ °ü°è¸¦ ºñ±³ÇÏ¿´´Ù. ±×¸®°í ÀÌ È¯ÀÚµéÀÇ BRCA µ¹¿¬º¯ÀÌ »óÅÂ¿Í ¸é¿ªÁ¶Á÷ÇÐÀû, º´¸®ÇÐÀû »óÅÂ¿Í ¿¹ÈÄ ÀÎÀڷμ­ÀÇ ¿ªÇÒµµ Á¶»çÇÏ¿´´Ù.

°á°ú: BRCA1/2 µ¹¿¬º¯À̸¦ Á¶»çÇÑ 101¸í Áß 14¸í¿¡¼­ 16°³ÀÇ µ¹¿¬º¯ÀÌ°¡ ÀÖ¾úÀ¸¸ç(13.9%), À¯¹æ¾Ï-³­¼Ò¾Ï °¡Á··ÂÀÌ ÀÖ´Â °æ¿ì(4/14, 28.6%), ¾çÃø¼º À¯¹æ¾ÏÀÌ ÀÖ´Â °æ¿ì(3/9, 33.3%)¿¡ BRCA1/2 µ¹¿¬º¯ÀÌ ºóµµ°¡ ³ô¾Ò´Ù. ¿¡½ºÆ®·Î°Õ ¼ö¿ëü À½¼ºÀÎ °æ¿ì BRCA1/2 ¾ç¼ºÀÌ 19.4% (12/62)·Î ¿¡½ºÆ®·Î°Õ ¼ö¿ëü ¾ç¼º ºñÀ² 5.1% (2/37)¿¡ ºñÇØ À¯ÀÇÇÏ°Ô ³ô¾Ò°í(p=0.038), HER-2 À½¼ºÀÎ °æ¿ì BRCA1/2 µ¹¿¬º¯ÀÌ À½¼º ºñÀ²ÀÌ 16.5% (13/79)·Î ¾ç¼º ºñÀ² 4.5% (1/22)¿¡ ºñÇØ ³ôÀº °æÇâÀ» º¸¿´À¸¸ç(p=0.073), ÇÁ·Î°Ô½ºÅ×·Ð ¼ö¿ëü´Â Â÷ÀÌ°¡ ¾ø¾ú´Ù. ¿¡½ºÆ®·Î°Õ ¼ö¿ëü, ÇÁ·Î°Ô½ºÅ×·Ð ¼ö¿ëü ¹× HER-2 ¸ðµÎ À½¼ºÀÎ °æ¿ì(triple negative)´Â BRCA1/2 µ¹¿¬º¯ÀÌ ºñÀ²ÀÌ 24.2% (8/33)·Î ¸Å¿ì ³ô¾Ò´Ù. Á¾¾çÀÇ Å©±â, ¸²ÇÁÀý ÀüÀÌ »óÅÂ, HER-2 »óÅ´ ´Üº¯·® º¯¼ö¿Í ´Ùº¯·® º¯¼ö ¸ðµÎ¿¡¼­ ¹«º´ »ýÁ¸¿¡ À¯ÀÇÇÑ ¿µÇâÀ» ¹ÌÄ¡´Â ÀÎÀÚ À̾úÀ¸³ª BRCA1/2 µ¹¿¬º¯ÀÌ »óÅ´ ¹«º´»ýÁ¸¿¡ À¯ÀÇÇÑ ÀÎÀÚ°¡ ¾Æ´Ï¾ú´Ù.

°á·Ð: ¸é¿ªÁ¶Á÷È­ÇÐÀûÀ¸·Î ¿¡½ºÆ®·Î°Õ ¼ö¿ëü³ª HER-2 À½¼ºÀ» º¸ÀÌ´Â ÀþÀº À¯¹æ¾Ï ȯÀÚ¿¡¼­ BRCA1/2 µ¹¿¬º¯ÀÌ ¹ß»ýÀÌ À¯ÀÇÇÏ°Ô ³ô¾ÒÀ¸¸ç, ÇÁ·Î°Ô½ºÅ×·Ð ¼ö¿ëü±îÁö ¸ðµÎ À½¼ºÀÎ °æ¿ì BRCA1/2 µ¹¿¬º¯ÀÌ°¡ ÀÖÀ» È®·üÀÌ 24.2% ·Î ³ô¾Æ¼­ À¯¹æ¾Ï À¯ÀüÀÚ µ¹¿¬º¯ÀÌ °¡´É¼ºÀ» ¿¹ÃøÇϴµ¥ µµ¿òÀ» ÁÙ ¼ö ÀÖ´Ù. Çѱ¹ÀÎ ÀþÀº ¿©¼º À¯¹æ¾Ï ȯÀÚ¿¡¼­ BRCA1/2 µ¹¿¬º¯ÀÌ »óÅ°¡ ¹«º´»ýÁ¸¿¡ À¯ÀÇÇÑ ÀÎÀÚ´Â ¾Æ´Ï¾úÀ¸³ª Á» ´õ ¸¹Àº ȯÀÚ¿Í ±ä ÃßÀû°üÂû ±â°£ÀÇ Ãß°¡ÀûÀÎ ¿¬±¸°¡ ÇÊ¿äÇÏ´Ù.

Purpose: Women with breast cancer diagnosed at an age of 40 years or younger have a greater prevalence of germline BRCA1 and BRCA2 mutations than the prevalence of women with breast cancer diagnosed at older ages. Several immunohistochemical characteristics have been identified in breast cancers from studies of Caucasian women with BRCA1/2 mutations having familial or early-onset breast cancers. The aim of this study is to determine whether early-onset breast cancer in BRCA1 or BRCA2 mutation carriers, who were not selected from a family history, could be distinguished by the use of immunohistochemical methods and could be distinguished from breast cancer in women of a similar age without a germline BRCA1 or BRCA2 mutation. We also analyzed the prognostic difference between BRCA1/2 related and BRCA1/2 non-related patients by the use of univariate and multivariate analysis.

Materials and Methods: Breast cancer tissue specimens from Korean women with early-onset breast cancers were studied using a tumor tissue microarray. Immunohistochemical staining of estrogen receptor (ER), progesterone receptor (PR) and HER-2, as well as the histology and grade of these specimens, were compared. The prognostic impact of immunohistochemical and histological factors as well as the BRCA1/2 mutation status was investigated separately.

Results: There were 14 cases and 16 deleterious BRCA1/2 mutations among 101 patients tested. A family history (4/14) and bilateral breast cancers (3/9) were high risk factors for BRCA1/2 mutations. BRCA1/2- associated cancers demonstrated more expression of ER-negative (19.4% versus 5.1%, p=0.038) and HER-2 negative than BRCA1/2 negative tumors, especially for tumors with BRCA1 tumors The BRCA1/2 mutation rate for patients with triple negative tumors (negative expression of ER, PR and HER-2) was 24.2%. Tumor size, nodal status, and HER-2 expression status were significantly associated with disease free survival, as determined by univariate and multivariate analysis, but the BRCA1/2 status was not a prognostic factor.

Conclusion: Breast cancer that occurs in women with a germline BRCA1 or BRCA2 mutations have recognizable
immunohistochemical features, which may be useful in identifying individuals that are more likely to carry
germline mutations. Although the BRCA1/2 mutation status was not a prognostic factor in Korean women with
early-onset breast cancer, more cases with a longer follow-up period are needed for further study.

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À¯¹æ¾Ï;BRCA1/2µ¹¿¬º¯ÀÌ;È£¸£¸ó¼ö¿ëü;HER-2
Breastcancer;BRCA1/2mutation;Hormonereceptor;HER-2

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