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: A - T carriers were reported to be moderately cancer - prone .
### Output Text:
<span class="disease">A - T</span> carriers were reported to be moderately <span class="disease">cancer - prone</span> . 