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: VEGF promoter - luciferase constructs were transiently cotransfected with a wild - type VHL ( wt - VHL ) vector in several cell lines , including 293 embryonic kidney and RCC cell lines .
### Output Text:
VEGF promoter - luciferase constructs were transiently cotransfected with a wild - type VHL ( wt - VHL ) vector in several cell lines , including 293 embryonic kidney and <span class="disease">RCC</span> cell lines . 