But while three-quarters of these were invasive cancers - the most dangerous type - around 20% were ductal carcinoma in situ (DCIS), more than half of which never become invasive.

• 然而即便其中四分之三为危害性最大的浸润性癌，依然有20%25的案例为原位乳腺管癌。半数以上的原位乳腺管癌不会发展为浸润性癌症。