LAUSR

Key Points Questions How do premenopausal women with early breast cancer use contraception, and what are the chosen methods and factors associated with contraceptive use? Findings In this cohort study of 2900 premenopausal women with early breast cancer enrolled in the prospective Cancer Toxicity study, 54.2% of patients reported contraceptive use at the time of diagnosis, with most patients using hormonal methods. Contraceptive use significantly decreased after primary treatment and during follow-up, when most patients reported use of reversible mechanical methods. Meaning These findings support the importance of raising awareness and improving targeted contraceptive counseling among premenopausal women with early breast cancer.