Hepatitis B virus (HBV) reactivation is a well-established complication of severe immunosuppression in patients with hematologic malignancy and positive hepatitis B surface antigen (HBsAg). Patients who receive high-dose chemotherapy, corticosteroids, rituximab, or have a bone marrow transplant are particularly at increased risk for HBV reactivation. However, limited information is available in the literature regarding HBV reactivation in patients with isolated anti-HBc, particularly in the setting of multiple myeloma (MM). We report two cases of HBV reactivation in MM patients with isolated anti-HBc positive with a rather atypical presentation. In conclusion, our cases highlight that clinicians need to be cognizant about this potentially fatal but preventable complication of chemotherapy and immunosuppression.
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