[Hepatitis B markers in children with oncological diseases].

High-sensitivity methods were employed to test blood serum for hepatitis B markers in 293 infant cancer patients. HBsAg was identified in 31.7 while anti-HBs--in 16.7% of cases. Hepatitis B markers most frequently occurred in patients suffering from lymphoproliferative diseases (60.1%). HBeAg was detected in 46.5% of patients with HBsAg. The results point to a high incidence of hepatitis B virus in cancer patients.