This is the case of NFIX-MAST1 [77] fusions in breast cancer and may also include the NFIX–PKN1 translocation, described in carcinoma of the skin [78], the BSG-NFIX fusion identified in breast cancer [79] and the NFIX–STAT6 gene fusion, which was identified in a tumor lesion with histological features of a solitary fibrous tumor [75]. The gene discussed is MAST1; the disease is breast cancer.