Cassette exons differentially spliced between high- and low-metastatic breast cancer cells showed enrichment for a number of RNA motifs, which could represent binding sites for RBPs involved in breast cancer malignancy, including PTBP1 [54,55], SRSF1 [28,30], and SRSF9 [30]. The gene discussed is SRSF9; the disease is breast carcinoma.