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: Common BRCA1 variants and susceptibility to breast and ovarian cancer in the general population .
### Output Text:
Common BRCA1 variants and susceptibility to <span class="disease">breast and ovarian cancer</span> in the general population . 