RESUMEN
Objective To explore the clinical features of sev er e aplastic anemia (SAA) patients with chronic hepatitis B virus (HBV) infection.Methods 737 SAA cases newly diagnosed in the institute of Hemat ology and Blood Disease Hospital,CAMS in recent 13 years (1991 ~ 2003) were anal yzed.The ratio of SAA patients with chronic hepatitis B (21 cases,group Ⅰ) in them was investigated.A case-control study was undertaken to investigate the di fferences of clinical and laboratory features、therapeutic effectiveness and pro gnosis between SAA patients with chronic HBV infection \[the cases with chronic hepatitis B and those with antibodies to hepatitis virus B (23 cases,group Ⅱ )\] and SAA control group (42 cases,group Ⅲ ).Results ①The ratio of SAA patients with chronic hepatitis B in all SAA was 2.8%.②There was no significant difference of clinical features am ong them before treatment.③The recovery of PB counts、bone marrow hematopoiesis of group Ⅰ was slower than that of group Ⅱ and group Ⅲ after treatment.Th e percentage of CD8 + cells of group Ⅰor Ⅲwas significantly higher than that of group Ⅱ (P