Therapy-induced autoimmunity may mediate the destruction of cancer cells. Previous studies have demonstrated that presence of autoimmune thyroid disorder is associated with favorable outcome in patients with solid cancer. Patients with diffuse large B cell lymphoma (DLBCL) who achieved complete response on positron emission tomography/computed tomography (PET/CT) after rituximab, cyclophosphamide, doxorubicin, vincristine, and prednisone (R-CHOP) therapy were enrolled in this study. The patients with and without diffuse thyroid uptake (DTU) were classified by PET/CT. A total of 270 patients were enrolled in this study. DTU related to autoimmune thyroiditis was present in 61 patients. The median time to DTU detection was 5.7 months (range, 0-21.3 months). High International Prognostic Index (IPI) score (progression-free survival [PFS], p = 0.001; overall survival [OS], p = 0.008), bulky mass ≥10 cm (PFS, p = 0.001; OS, p = 0.001), bone marrow involvement (PFS, p < 0.001; OS, p = 0.001), and DTU after R-CHOP therapy (PFS, p < 0.001; OS, p = 0.001) were significantly associated with PFS and OS. High IPI score (PFS, p = 0.003; OS, p = 0.014), BM involvement (PFS, p = 0.009; OS, p = 0.039), and DTU after R-CHOP therapy (PFS, p = 0.002; OS, p = 0.002) were independently associated with PFS and OS. DTU after R-CHOP therapy independently predicted favorable outcomes in patients with DLBCL.
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