May 2023 | Authored by: George M. Pikler, M.D., Ph.D., FACP
Interrupting Adjuvant Endocrine Therapy to Attempt Pregnancy in Breast Cancer Survivors
Having children remains a high priority for many young breast cancer survivors. Some of them would chose to become pregnant after a breast cancer diagnosis. The POSITIVE (Pregnancy Outcome and Safety of Interrupting Therapy for Women with Endocrine Responsive Breast Cancer) trial (1) was designed to address the safety of a temporary break in endocrine therapy in young women with hormone receptor–positive early breast cancer who wish to become pregnant. The trial data showed that during a median of 3.4 years of follow-up, interruption of adjuvant endocrine therapy for up to 2 years to attempt pregnancy does not appear to increase the risk of recurrence or of contralateral breast cancer in the subsequent 3 years. Physicians should now incorporate these positive data into their shared decision-making process with patients. A longer-term follow-up will be necessary to determine the safety of interrupting endocrine therapy.
(1) N Engl J Med 2023; 388: 1645-1656