Assertion: mastectomy | /r/HasProperty | surgical removal of a breast
Facets:
value: for prevention
type: PURPOSE
Source sentences:
text: A mastectomy is the surgical removal of a breast.
text: Mastectomy is the surgical removal of the breast for the treatment or prevention of breast cancer
text: After all, an amputation is the surgical removal of an extremity; a mastectomy is the surgical removal of a breast.