In the sentence extracted from biomedical literature, identify all the disease entities. The required answer format is the same sentence with HTML <span> tags to mark up specific entities. 
### Entity Markup Guides:
Use <span class="disease"> to denote a disease.

### Input Text: Mutation analysis of BRCA1 and BRCA2 in a male breast cancer population .
### Output Text:
Mutation analysis of BRCA1 and BRCA2 in a <span class="disease">male breast cancer</span> population . 