STK3 and cancer: Aside from the aforementioned circRNAs, increased circHSDL2 in BC patients was found to enhance the cancer’s capacity to invade in the matrigel and the transwell assays by sequestering miR-7978, leading to increased expression of Zinc Finger Protein 704 (ZNF704) and reduced expression of mammalian ste20-like kinase 2 (MST2) (Wang et al. 2024).