正确理解抗-HBc的临床意义
DOI: 10.12449/JCH251006
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摘要: 抗-HBc是既往HBV暴露及潜在病毒持续存在的重要标志物。在急性HBV感染过程中,HBsAg出现后不久,最早出现的抗体为免疫球蛋白M型抗-HBc(抗-HBc-IgM),通常持续6~12个月,随后出现免疫球蛋白G型抗-HBc(抗-HBc-IgG)。在慢性感染者发生肝炎急性发作时,抗-HBc-IgM亦可能再次出现,但其滴度较急性感染者低。孤立性抗-HBc阳性可见于既往HBV感染已自愈/功能性治愈或隐匿性感染者,在化疗、免疫治疗、输血或器官移植时,仍存在HBV再激活或传播风险。因此,准确识别抗-HBc的临床价值对于HBV感染的全面评估和个体化管理具有重要意义。Abstract: Hepatitis B core antibody (anti-HBc) is an important marker of prior HBV exposure and potential viral persistence. During acute HBV infection, anti-HBc IgM is the earliest antibody to appear shortly after HBsAg, usually lasting for 6 — 12 months, followed by anti-HBc IgG. In patients with chronic infection experiencing acute hepatitis flares, anti-HBc IgM may reappear, though typically at lower titers than in acute infection. “Isolated anti-HBc positivity” may indicate resolved/functional cure of prior HBV infection or occult HBV infection, and there is still a risk of HBV reactivation or transmission during chemotherapy, immunotherapy, blood transfusion, or organ transplantation. Therefore, accurate recognition of the clinical significance of anti-HBc is essential for comprehensive evaluation and individualized management of HBV infection.
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Key words:
- Hepatitis B Core Antibody /
- Hepatitis B Virus Screening /
- Reinfection
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表 1 美国胃肠病学会对HBsAg阴性/抗-HBc阳性患者HBV再激活风险的分类
Table 1. American Gastroenterological Association classification of reactivation risk in HBsAg-negative/anti-HBc-positive patients
再激活风险等级 估计再激活发生率 相关治疗药物类型 高风险 >10% B细胞清除药物,如利妥昔单抗(Rituximab)、奥法妥木单抗(Ofatumumab);
TNF-α抑制剂,如依那西普(Etanercept)、阿达木单抗(Adalimumab)、赛妥珠单抗
(Certolizumab)、英夫利昔单抗(Infliximab);
其他细胞因子抑制剂和整合素抑制剂,如阿巴西普(Abatacept)、乌司奴单抗
(Ustekinumab)、那他珠单抗(Natalizumab)、维得利珠单抗(Vedolizumab);
酪氨酸激酶抑制剂,如伊马替尼(Imatinib)、尼洛替尼(Nilotinib);
蒽环类药物,如多柔比星(Doxorubicin)、表柔比星(Epirubicin)中风险 1%~10% 中/大剂量糖皮质激素治疗≥4周 低风险 <1% 传统免疫抑制剂,如硫唑嘌呤(Azathioprine)、6-巯基嘌呤(6-Mercaptopurine)、甲氨蝶呤
(Methotrexate);
关节腔注射激素;
糖皮质激素治疗≤1周;
低剂量糖皮质激素治疗≥4周表 2 乙型肝炎血清学标志物解释
Table 2. Interpretation of HBV biomarkers
血清标志物 临床解释 注释 HBsAg 抗-HBs 抗-HBc-IgG 抗-HBc-IgM - - - - 未感染过HBV;
未接种或疫苗接种不足建议接种疫苗以降低感染风险 + - + + 急性乙型肝炎或慢性乙型肝炎急性发作 短期内定期评估ALT变化,6个月后
复查乙型肝炎相关血清标志物+ - + - 慢性乙型肝炎 评估是否需要抗病毒治疗 - + - - 疫苗接种后获得免疫力 抗体滴度≥100 IU/L为理想水平 - + + - HBV既往感染者,免疫控制不充分;
抗-HBs滴度<10 IU/L;
在免疫抑制状态下有HBV再激活风险;
在肝脏或骨髓移植中可能传播HBV观察随访患者;
在化疗、免疫抑制治疗或ALT异常时
需检测HBV DNA;
传播风险低,限于特殊临床情境- - + - 既往感染HBV并已恢复HBV;
再激活风险低观察随访患者;
在接受化疗或免疫抑制时,可能需进
行HBV DNA检测;
在正常情况下几乎无传播风险 -
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