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: Although we found no FEN1 mutations , a frameshift mutation in MSH3 was observed in an endometrial carcinoma and in an endometrial carcinoma cell line .
### Output Text:
Although we found no FEN1 mutations , a frameshift mutation in MSH3 was observed in an <span class="disease">endometrial carcinoma</span> and in an <span class="disease">endometrial carcinoma</span> cell line . 