PIP: Currently, there is no evidence that the IUD causes cancer in women. Many long term studies have failed to provide clinical evidence that IUD causes an increased incidence of carcinoma of the endometrium and cervix. Causative factors of uterine carcinoma, causative factors for the contraceptive effects of the IUD, histopathologic changes in uterine specimens obtained from IUD users and other problems relating to the effect of the IUD are discussed. (Author's, Modified)