In the sentence extracted from biomedical literature, identify all the chemical entities. The required answer format is the same sentence with HTML <span> tags to mark up specific entities. 
### Entity Markup Guides:
Use <span class="chemical"> to denote a chemical.

### Input Text: CONCLUSION : Our data suggest that rHuEPO - beta correctable CAB - induced anemia occurs in 14 . 3 % of prostate cancer patients after 6 months of therapy .
### Output Text:
CONCLUSION : Our data suggest that rHuEPO - beta correctable CAB - induced anemia occurs in 14 . 3 % of prostate cancer patients after 6 months of therapy . 