The reason may be that symptoms of radiodermatitis itchiness are associated with serine proteases (e.g. KLK, matriptase, prostaglandins, or trypsin-like enzymes) and single nucleotide polymorphism genotyping (GSTA1 rs3957356-CT, MAT1A rs2282367-GG) [34]. The gene discussed is GSTA1; the disease is radiodermatitis.