In TIF1γ-DM patients, the primary lesions were located in the lung (n = 3), uterus (n = 2), stomach (n = 1), colon (n = 2), breast (n = 2), and ovary (n = 1), or was a lymphoma (n = 1); malignant lesions were not detected in two patients. The gene discussed is TRIM33; the disease is lymphoma.