We thank Dr Grant for her continued interest in our study. The Royal College of General Practitioners’ (RCGP) Oral Contraception Study has prospectively followed up women forward in time, with information about oral contraceptive (OC) exposure collected often many years before the diagnosis of cancer.
Iversen, L., Hannaford, P. C., & Fielding, S. (2017). Reply: Lifetime cancer risk with progestin and estrogen oral contraceptives and hormone therapy. American Journal of Obstetrics and Gynecology, 217(2), 233. https://doi.org/10.1016/j.ajog.2017.05.006