examined the rs3828610 SNP of PDGFRB in 96 patients with nonfamilial MMD and 96 controls of Chinese Han ethnicity, but did not find a significant association between PDGFRb, MMP3, TIMP‐2, or RNF213 gene polymorphisms and nonfamilial MMD.76 The gene discussed is TIMP2; the disease is multiminicore myopathy.