Cancer risk among... Cancer risk among users of oral contraceptives: cohort data from the Royal College of General Practitioner's oral contraception study Research Cancer risk among users of oral contraceptives: cohort data from the Royal College of General Practitioner's oral contraception study BMJ 2007; doi: https://doi.org/10.1136/bmj.39289.649410.55 (Published 11 September 2007) Cite this as: