In the present study, the flake-like PPK was identified in 6 patients with MGUS or MM of type IgG κ, 3 patients with SMM or MM of type IgA λ, 2 patients with MGUS or MM of type IgA κ, 2 patients with MM of type LC λ and a patient diagnosed with MGUS of type IgG λ. The gene discussed is CD79A; the disease is Miyoshi myopathy.