Assertion: tumor | /r/HasProperty | rare
Facets:
value: quite
type: DEGREE
Source sentences:
text: Because these tumors are rare, treatment is often given as part of a clinical trial.
text: Because these tumors are rare, treatment is often given as part of a clinical trial, and usually includes chemotherapy with several different drugs.
text: These tumors are quite rare and are usually considered low-grade cancers, with approximately 70 percent presenting as Stage I disease (cancer is limited to one or both ovaries).