CALCA and cancer: In the control group of non-cancer patients the median PCT level (0.029 ng/ml [range 0–0.203]) was lower than in cancer patients with stage I-III disease (0.127 ng/ml [range 0–18.13]; p<0.0001) or those with advanced stage IV (0.190 ng/ml [range 0–154.7]; p<0.0001).