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: Thus , we screened 16 endometrial carcinomas with microsatellite instability for alterations in FEN1 ( the human homolog of RTH ) and in MSH3 ( refs 12 - 14 ) .
### Output Text:
Thus , we screened 16 <span class="disease">endometrial carcinomas</span> with microsatellite instability for alterations in FEN1 ( the human homolog of RTH ) and in MSH3 ( refs 12 - 14 ) . 