TGFB1 and Dyggve-Melchior-Clausen disease: This detection revealed that the concentration of TGF-β1 was 27.11 ± 7.58 pg/ml in AH samples of the DMC group and 20.13 ± 9.28 pg/ml in AH samples of the ARC group; the differences between the two groups were statistically significant (P value = 0.001) (Fig. 1a).