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: This cellular transformation in vitro will facilitate studies on the mechanism of PAX3 - FKHR - induced oncogenesis . .
### Output Text:
This cellular transformation in vitro will facilitate studies on the mechanism of PAX3 - FKHR - induced oncogenesis . . 