ELK1 and cancer: By contrast, moderate p-ELK1 expression was marginally or significantly associated with lower progression-free survival (PFS) (0/1+ vs. 2+, P = 0.055; Figure 2a,b), overall survival (OS) (0/1+ vs. 2+, P = 0.020; figure not shown), and cancer-specific survival (CSS) (0/1+ vs. 2+, P = 0.008; Figure 2c,d) rates.