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: No association was found between the presence of bilateral breast cancer or the number of breast cancers in a family and the detection of a BRCA1 mutation , or between the position of the mutation in the BRCA1 gene and the presence of ovarian cancer in a family .
### Output Text:
No association was found between the presence of bilateral <span class="disease">breast cancer</span> or the number of <span class="disease">breast cancers</span> in a family and the detection of a BRCA1 mutation , or between the position of the mutation in the BRCA1 gene and the presence of <span class="disease">ovarian cancer</span> in a family . 