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: The common hereditary forms of breast cancer have been largely attributed to the inheritance of mutations in the BRCA1 or BRCA2 genes .
### Output Text:
The common hereditary forms of <span class="disease">breast cancer</span> have been largely attributed to the inheritance of mutations in the BRCA1 or BRCA2 genes . 