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 magnitude of the relative risk associated with a rare HRAS1 allele was not altered by adjusting for the other known risk factors for hereditary ovarian cancer ( 5 ) .
### Output Text:
The magnitude of the relative risk associated with a rare HRAS1 allele was not altered by adjusting for the other known risk factors for <span class="disease">hereditary ovarian cancer</span> ( 5 ) . 