Ninety-two consecutive patients with unresectable hepatocellular carcinoma (HCC) greater than 2 cm and less than 5 cm in diameter were treated by transcatheter arterial chemoembolization using autologous blood clot as an embolizing agent (Short-TAE; S-TAE). Survival, patency of hepatic arteries and side effects were retrospectively analyzed. The median follow-up interval was 42 months. The median size of the main tumor was 3.4 cm in diameter. All tumors were determined to be inoperable because of intrahepatic spread of tumors and/or poor hepatic functional reserves. S-TAE was performed by injecting a mixture of iodized oil and anticancer drugs followed by embolization of hepatic arteries with autologous blood clot. Embolization with clots maintained patency of hepatic arteries in all the patients. The overall survival rates for 92 HCC patients at 1, 3, 5, 7 and 8 years were estimated by the Kaplan-Meier method to be 100, 52, 34, 12 and 6%, respectively, which were better compared with prior records for conventional method with gelfoam. S-TAE was successfully performed in 16 patients with Childs class C liver cirrhosis presenting icterus and ascitis. The survival rates for Childs class C patients at 1, 2 and 3 years were 100, 66 and 32%, respectively. The Cox proportional hazard model was used to assess influence of each pretreatment parameter (age, gender, virus marker, stage of cirrhosis, number of tumor) on survival. The univariate analysis demonstrated that both the stage of cirrhosis and the multiplicity of tumor were significant factors predicting survival (p=0.003 and 0.046, respectively). The multivariate analysis showed the stage of cirrhosis to be the sole factor which significantly affected prognosis of HCC patients (p=0.005). In conclusion, chemoembolization with autologous blood clot is an effective and safe therapeutic option for unresectable HCC smaller than 5 cm. The hepatic functional reserves play a key role in determining prognosis of HCC patients.

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