USP15 and USP4 regulate the SRSF1 alternative splicing to promote the proliferation of SCLC cancer cells; SRSF2 controls VEGFR1 precursor mRNA to promote SCLC progression; Circ_006006 upregulates SRSF7 to promote SCLC progression. Here, FLT1 is linked to small cell lung carcinoma.