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: Mutations in the ARP gene are thus commonly observed in pancreatic cancer , as well as many other cancers .
### Output Text:
Mutations in the ARP gene are thus commonly observed in <span class="disease">pancreatic cancer</span> , as well as many other <span class="disease">cancers</span> . 