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: Ovarian cancer risk in BRCA1 carriers is modified by the HRAS1 variable number of tandem repeat ( VNTR ) locus .
### Output Text:
<span class="disease">Ovarian cancer</span> risk in BRCA1 carriers is modified by the HRAS1 variable number of tandem repeat ( VNTR ) locus . 