Assertion: tumor antigen | /r/HasProperty | classified into two main categories
Facets:
value: based on the pattern of expression
type: CAUSE
Source sentences:
text: Based on the pattern of expression, tumor antigens can be classified into two main categories: tumor-specific antigens (TSA), which are present only on tumor cells; Tumor-associated antigens (TAA), which are present on both tumor cells and some normal cells.