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The actual risk appears related to duration of usage and may also be related to the type of contraceptive steroid used. Further investigation is required determine the oncogenic potential of oral contraceptives and the malignant potential of benign tumors.<\/jats:p>","DOI":"10.1002\/jso.2930180112","type":"journal-article","created":{"date-parts":[[2007,2,20]],"date-time":"2007-02-20T07:40:20Z","timestamp":1171957220000},"page":"73-85","source":"Crossref","is-referenced-by-count":18,"title":["Studies on the role of oral contraceptive use in the etiology of benign and malignant liver tumors"],"prefix":"10.1002","volume":"18","author":[{"given":"Curtis","family":"Mettlin","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nachimuthu","family":"Natarajan","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2006,7,19]]},"reference":[{"key":"e_1_2_1_2_2","doi-asserted-by":"publisher","DOI":"10.1126\/science.124.3227.891"},{"key":"e_1_2_1_3_2","first-page":"133","volume-title":"Oral Contraceptives: Update on Usage, Safety and Side Effects","author":"Population Reports","year":"1979"},{"key":"e_1_2_1_4_2","volume-title":"Oral Contraception","author":"Drill VA","year":"1966"},{"key":"e_1_2_1_5_2","first-page":"367","article-title":"Primary neoplasms of the liver","volume":"37","author":"Warvi WN","year":"1944","journal-title":"Arch Pathol"},{"key":"e_1_2_1_6_2","first-page":"23","article-title":"Benign tumors of the liver. 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