SRSF6 and neoplasm: Furthermore, SRSF6 was positively correlated with two established tumor cell proliferation markers, Ki67 (r = 0.2862, p < 0.0001, n = 564, Fig. S1I) and proliferating cell nuclear antigen (PCNA; r = 0.5146, p < 0.0001, n = 564, Fig. S1J) in HNSC tissues, including tumor and normal tissues, from the TCGA database.