FCRL5 and Miyoshi myopathy: Moreover, FCRL5 expression is linked to a 1q21 gain in high-risk MM.20 Therefore, Effectiveness of FCRL5 CAR-T cells utilizing bone marrow mononuclear cells(BMMCs) in 1q21-amplified MM was evaluated from patients with this chromosomal abnormality (Supplementary Fig. S2d).