Nevirapine, as an immunomodulator, has been shown to inhibit the secretion of cytokine IL‐6 in HIV‐infected patients.29 Accumulating studies suggest that thyroid cancer is also an autoimmune disease.30, 31, 32 We found that nevirapine could inhibit IL‐6 mRNA expression in thyroid cancer by RT‐PCR. This evidence concerns the gene IL6 and autoimmune disease.