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JOURNAL ARTICLE
REVIEW
Liver tumours.
Baillière's Clinical Gastroenterology 1988 April
Humans are remarkably resistant to many carcinogens that readily produce liver tumours in rodents, particularly the rat. The neoplastic process has been extensively studied in animal experiments, but little is known so far of how it evolves in humans. Few drugs have been shown to cause liver tumours in humans, and the risk appears to be low. The best-known examples are C17-alkylated or ethinylated gonadal sex steroids. Oral contraceptives have now been in use by millions for thirty years, but only a few hundred cases at most of liver cell adenoma have been observed. The role of these substances in liver cell carcinoma remains controversial, and the evidence is weaker still in relation to focal nodular hyperplasia and other tumour-like conditions. Anabolic-androgenic steroids stand out as the major cause of peliosis, but liver cell tumours induced by them seem to be adenomas and not carcinomas as originally suggested. The effect that both oral contraceptives and anabolic-androgenic steroids have on liver vasculature is of great clinical importance as the most important complication of liver tumours is rupture, leading to life-threatening haemorrhage. For this reason, liver tumours arising in users of these drugs should be removed whenever feasible. Thorium dioxide will remain a risk factor for the development of angiosarcoma, liver cell carcinoma and bile duct carcinoma for some time yet, and the number of patients who have been exposed is high--tens of thousands at least. The evidence of a carcinogenic role for many other drugs is anecdotal or weak. Neoplasia in the liver seems to be the least important side-effect of drugs in clinical use.
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