British consider pill safe.
The British Committee on the Safety of Medicines concluded that all the research performed on more than 13,000 experimental animals indicated that prolonged administration of both estrogen and progesterone for contraceptive purposes does not  create a hazard of developing cancer in women.
D003267:Contraception; D003276:Contraceptives, Oral; D019049:Developed Countries; D004194:Disease; D005060:Europe; D005193:Family Planning Services; D009369:Neoplasms; D006113:United Kingdom
D003276:Contraceptives, Oral
Cancer; Contraception; Contraceptive Methods--side effects; Developed Countries; Diseases; Europe; Family Planning; Neoplasms; Northern Europe; Oral Contraceptives--side effects; United Kingdom; Western Europe