PLK1 and cancer: RNA interference (RNAi)‐mediated depletion of PLK1 and FGFR1 (Appendix Fig S2F and G) significantly enhanced the anti‐proliferative effect elicited by single knockdown of PLK1 or FGFR1 in lung (A549, H358, H441) and pancreatic (MIA PaCa‐2) cells, but not in the colon (SW620) cancer cells (Fig 2E), in line with the results of pharmacological inhibition (Fig 2A–D).