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: In patients with stage II disease whose tumors expressed DCC , the five - year survival rate was 94 .
### Output Text:
In patients with stage II disease whose <span class="disease">tumors</span> expressed DCC , the five - year survival rate was 94 . 