ACVR2A and neoplasm: The most recurrent frameshift MSI events are found in ACVR2A (51.6% of the tumours), KIAA2018 (51%), SLC22A9 (50%), ASTE1 (45%), TGFBR2 (44%), NDUFC2 (36%), LTN1 (36%) and SEC31A (36%).