IL6 and colorectal cancer: High serum CRP concentrations have been correlated with elevated IL-6 serum concentrations (Pelliniemi et al, 1995; Ljungberg et al, 1997) and with poor prognosis in solid tumours such as colorectal cancer (Chung and Chang, 2003) and with mortality in RCC (Karakiewicz et al, 2007).