PFS in TT4 for GEP70 low-risk myeloma by arm and metaphase cytogenetics. (A) Comparison of no CA vs hypodiploidy or del.13. (B) Comparison of no CA vs other CA. CA, metaphase cytogenetic abnormalities are present; No CA, metaphase cytogenetic abnormalities absent; Other CA, CA present, but not hypodiploidy or del.13; TT4-L, TT4 light arm; TT4-S, TT4 standard arm.