Table 1.
Distribution of the various histologic subtypes in 778 invasive carcinomas involving the male breast
| Histologic subtype | Number of cases | Percentage |
|---|---|---|
| Infiltrating duct carcinoma not otherwise specified, includinga | 643 | 84.7 |
| Carcinoma associated with Paget’s disease | 34 | |
| Carcinoma with prominent apocrine features | 17 | |
| Carcinoma with medullary features | 4 | |
| Carcinoma with osteoclast-like giant cells | 3 | |
| Carcinoma with focal signet rings | 2 | |
| Carcinoma with focal clear cells | 2 | |
| Pleomorphic carcinoma | 2 | |
| Carcinoma with no notable distinctive features | 579 | |
| Papillary intraductal carcinoma with invasion in the form of infiltrating duct carcinoma | 34 | 4.48 |
| Mixed infiltrating duct and mucinous carcinoma | 26 | 3.4 |
| Pure mucinous carcinoma | 21 | 2.8 |
| Adenoid cystic carcinoma | 8 | 1.05 |
| Tubular carcinoma | 6 | 0.8 |
| Small cell carcinoma | 6 | 0.8 |
| Invasive lobular carcinoma | 3 | 0.39 |
| Solid neuroendocrine carcinoma | 3 | 0.39 |
| Mixed lobular and ductal carcinoma | 3 | 0.39 |
| Adenocarcinoma with spindle cell metaplasia | 2 | 0.26 |
| Pure signet ring carcinoma (no in situ component) | 1 | 0.13 |
| Invasive cribriform carcinoma | 1 | 0.13 |
| Secretory carcinoma | 1 | 0.13 |
| Squamous cell carcinoma | 1 | 0.13 |
| Total | 759 | 100 |
| Metastatic lesions | 19 | |
| Final total | 778 |
aSubsets included for information only (not WHO categories)