Two studies find no link between use of oral contraceptives and development of pituitary tumors.
D000293:Adolescent; D000328:Adult; D000368:Aged; D003276:Contraceptives, Oral / Q000009:adverse effects*; D005260:Female; D006801:Humans; D008599:Menstruation Disturbances / Q000139:chemically induced; D008875:Middle Aged; D010911:Pituitary Neoplasms / Q000139:chemically induced*; D011388:Prolactin / Q000378:metabolism
D003276:Contraceptives, Oral; D011388:Prolactin