Sera from 65 patients with primary liver carcinoma (PLC) and 69 sex- and age-matched controls were examined for Hepatitis B virus markers. Forty two of the patients (65%) and 25 controls (36%) were HBsAg positive. Anti-HBc was demonstrated in over 80% and in 84% of the study groups respectively. Over 70% of hepatitis B infection was anicteric and traditional surgical intervention correlated with prevalence of PLC. The data provide support for the etiological role of HBV in Nigerian patients with PLC; this is the first report that the incidence of PLC is highest in the northern Savannah region of Nigeria.