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| Question: 20120095 |
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Status Final References Source 1: 2007 MP/H Rules pgs: Notes: Source 2: pgs: Notes: Question MP/H Rules/Multiple primaries--Breast: Regarding rule M6 in the breast MP/H rules, if a patient has a left breast inflammatory carcinoma (ductal with apocrine features on bx), and during work-up, an incidental 1.2 cm lobular carcinoma is discovered in the lateral right breast - localized without any skin involvement - does M6 still apply and this is considered a single primary? The managing physician seems to imply that these are 2 different primaries. However, rule M6 seems to state that inflammatory in either breast makes this a single primary. Discussion Answer Rule M7 applies to this case. Abstract two primaries: ductal with apocrine features in the left breast, and lobular carcinoma in the right breast.
M6 applies to a diagnosis inflammatory carcinoma alone. When other histologies are present, continue to the next applicable rule.
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