Kristen D Brantley, Shoshana M Rosenberg, Laura C Collins, Kathryn J Ruddy, Rulla M Tamimi, Lidia Schapira, Virginia F Borges, Ellen Warner, Steven E Come, Yue Zheng, Gregory J Kirkner, Craig Snow, Eric P Winer, Ann H Partridge
IMPORTANCE: Among women diagnosed with primary breast cancer (BC) at or younger than age 40 years, prior data suggest that their risk of a second primary BC (SPBC) is higher than that of women who are older when they develop a first primary BC. OBJECTIVE: To estimate cumulative incidence and characterize risk factors of SPBC among young patients with BC. DESIGN, SETTING, AND PARTICIPANTS: Participants were enrolled in the Young Women's Breast Cancer Study, a prospective study of 1297 women aged 40 years or younger who were diagnosed with stage 0 to III BC from August 2006 to June 2015...
April 11, 2024: JAMA Oncology