MYB and adrenal cortex carcinoma: Consequently, our summary, which includes all up-to-date studies investigating the incidence of the MYB-NFIB fusion in ACC, indicates that t(6;9) rearrangement was observed in 57% (127/223) of all ACC tumors analyzed using in situ hybridization techniques, and the chimeric mRNA transcript was detectable in 51.1% (162/317) of the tumors (Table 1).