during the prospective phase of the study from 1975 to 1981 , the lowest incidence of breast carcinoma ( 67.3:100,000 ) was observed in the estrogen-progestogen users and was significantly lower than that of the untreated group ( 342.3:100,000 ) and lower than that expected from both the third national cancer survey and the national cancer institute system for electronic evaluation and retrieval ( seer ) data ( p less than or equal to 0.01 ) .
C0678222
the
C0006826
cancer