The growth of hepatocellular carcinoma (HCC) is thought to be dependent on androgens, as androgen receptors are present in most of these tumors. The aim of this multicenter trial was to assess the effect of antiandrogens in patients who have advanced HCC. Male patients with advanced HCC were randomized into 2 groups treated with (1) T reatment of patients who have symptomatic or advanced hepatocellular carcinoma (HCC) is still a challenge, because the mean survival is only a few months. 1 As curative treatments such as surgery or percutaneous ablation are excluded, arterial chemoembolization is the preferred palliative option; however, improved survival is only observed in a small percentage of patients with good liver function. 2 No medical treatment has been proven effective. 2 The influence of sex hormones on the growth of HCC has been suspected for a long time. 3 On the basis of experimental studies and findings showing estrogen receptors in tumor cells, treatment with tamoxifen, an antiestrogenic drug effective in breast cancer, 4 has been tested in patients who have unresectable HCC. 5,6 The positive influence of androgens on HCC growth is also supported by other results. First, HCC mainly occurs in males (with a male/female ratio between 5 and 9 1 ), with a poorer outcome in males than in females. 7 Second, occurrence of HCC has been reported in patients treated with androgens 8 or in bodybuilders. 9 Third, serum testosterone has been found to be a predictive factor of HCC occurrence in patients with hepatitis C virus and cirrhosis 10 and in hepatitis B virus carriers. 11 Fourth, androgen receptors have been found in normal livers and in livers with cirrhosis 12 as well as HCC. 13 In tumor cells, androgen receptors seem to be present more frequently and in