Studies have analyzed cases of sMN in patients with hepatitis B, hepatitis C, sarcoidosis, and malignancies and found positive staining for PLA2R in 64% (25 of 39), 64% (7 of 11), 75% (3 of 4), and 70% (7 of 10) of cases, respectively [16,24,25]. The gene discussed is PLA2R1; the disease is sarcoidosis.