It is noteworthy that, when myositis/MG was suspected, complementary laboratory tests, such as anti-acetylcholine receptor antibodies (AChR), myohemoglobin, RyR-Ab, anti-NOR-90, anti-Ro-52 antibodies, anti-muscle specific kinase (MuSK) [85], anti-striated muscle, Asialo-GM1 [40], anti-GM1 [20], anti-SM [86], anti-TG, anti-TPO, anti-mitochondria, anti-SRP, and anti-PM/Scl100 [65] were carried out (See Table 1). This evidence concerns the gene TRIM21 and myositis disease.