Assertion: cancer's type | /r/CapableOf | spread to other parts of the body
Facets:
value: in very rare cases
type: TEMPORAL
Source sentences:
text: Several types of benign bone tumors can, in rare cases, become malignant and spread to other parts of the body (4).
text: But only in very rare cases does this type of carcinoma spread to other parts of the body.