臨牀消化器内科 Vol.24 No.6(1-6)


特集名 B型肝炎 -- 病態解明と治療の最前線
題名 B型肝炎の病態解明最前線 (6) 化学療法によるB型肝炎再活性化とその対策
発刊年月 2009年 06月
著者 桶谷 真 鹿児島大学大学院消化器疾患・生活習慣病学
著者 宇都 浩文 鹿児島大学大学院消化器疾患・生活習慣病学
著者 井戸 章雄 鹿児島大学大学院消化器疾患・生活習慣病学
著者 坪内 博仁 鹿児島大学大学院消化器疾患・生活習慣病学
【 要旨 】 近年,抗CD-20抗体であるリツキシマブを併用する免疫抑制・化学療法の登場により,HBs抗原陽性キャリアのみならずHBs抗原陰性の既往感染者(HBc抗体またはHBs抗体陽性)からのHBV再活性化が増加している.このようなHBs抗原陰性例からのHBV再活性化はde novo B型肝炎と呼ばれ,劇症化率が高く予後はきわめて不良である.対策としてHBs抗原陰性例ではさらにHBc抗体/HBs抗体検査でスクリーニングし,いずれかが陽性の場合は治療中および終了後にHBV-DNAをモニタリングし,陽転化した時点でただちに核酸アナログ製剤を投与することが推奨される.
Theme Cutting Edge : Pathogenesis and Treatment of Hepatitis B
Title Prevention of Chemotherapy-induced Viral Hepatitis B Reactivation
Author Makoto Oketani Department of Digestive and Life-style Related Disease, Kagoshima University Graduate School of Medical and Dental Sciences
Author Hirofumi Uto Department of Digestive and Life-style Related Disease, Kagoshima University Graduate School of Medical and Dental Sciences
Author Akio Ido Department of Digestive and Life-style Related Disease, Kagoshima University Graduate School of Medical and Dental Sciences
Author Hirohito Tsubouchi Department of Digestive and Life-style Related Disease, Kagoshima University Graduate School of Medical and Dental Sciences
[ Summary ] Reactivation of the hepatitis B virus (HBV) is common following chemotherapy and is associated with high mortality rates despite prompt anti-vairal treatment. Consequently, prophylactic anti-viral treatment is recommended for HBsAg-positive patiens before chemotherapy or immunosuppressive treatment. Recently, HBV reactivation related to newer therapeutic regimens, such as rituximab (anti-CD20)-plus-CHOP has been increasingly reported. HBV reactivation also occurs in patients in posthepatitis B status (negative for HBsAg and positive for HBcAb and/or HBsAb). This condition is associated with a higher risk of fulminant failure with a mortality rate of 100%. We proposed guidelines for screening and preemptive anti-viral treatment for patients at risk. Pre-treatment anti-HBc and anti-HBs testing should be performed in HBsAg-negative patients, especially those receiving rituximab plus steroid-containig regimens. Furthermore, anti-HBc positive and/or anti-HBs positive patients should be monitored for detectable increases in serum HBV DNA during and after completion of chemotherapy. This will facilitate prophylactic commencement of nucleoside analogs.
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