Prognostic value of serum C-reactive protein (CRP) and cytokeratin 19 fragments (Cyfra 21-1) but not carcinoembryonic antigen (CEA) in surgically treated patients with non-small cell lung cancer

The aim of the study was to assess the prognostic value of cytokeratin 19 fragments (Cyfra 21-1), carcinoembryonic antigen (CEA) and C-reactive protein (CRP) in surgically treated NSCLC patients. 50 NSCLC patients (25 adenocarcinoma, 21 squamous cell and 4 adenosquamous), clinical stages I and II, age 42-89 years, entered the study. CEA, Cyfra 21-1 and CRP concentrations were measured in serum taken before surgery, CEA and Cyfra 21-1 in 50 patients, CRP - in 46 patients. The survival was calculated from the date of surgical treatment until death or until the end of the observation time. The results were expressed as medians (95%CI). Cyfra 21-1 concentration was 2.1 (0.7-14.5) ng/mL. Survival time in the patients with Cyfra 21-1 ≤ 2 ng/mL, and > 2 ng/ /mL was 79 (14.85-88.2) and 29 (5.7-87.6) months, (p < 0.026). CEA concentration was 2.68 (0.87-72.7) ng/mL, significantly higher in adenocarcinoma than in squamous cell lung cancer - 4.38 ng/mL (1.67-41.35) vs. 2.2 ng/mL (1.0-6.1), p = 0.002. CRP concentration was 5.45 (0-122.6) mg/L. Significant dependence was found between CRP and pathological tumour size (pT). Median CRP values in pT1, pT2 and pT3+4 tumours were: 2.8 mg/L, 6.9 mg/L and 23.5 mg/L, respectively. Survival time of the patients with CRP ≤ 10 mg/L and CRP > 10 mg/L was 79 (14.85-88.2) and 29.5 (5.7-87.6) months, respectively (p = 0.045). CRP > 10 mg/L and Cyfra 21-1 > 2 ng/mL were the only significant preoperative prognostic indicators (HR 2.08 and 2.04, respectively). Among the postoperative parameters, pathological stage of disease (p-stage) and pT were the significant prognostic indicators (HR 2.1 and 2.42, respectively). In the present study, concerning surgically treated NSCLC patients, preoperative CRP > 10 mg/L and Cyfra 21-1 > 2 ng/mL were the only negative prognostic indicators, while pT and p-stage were significant postoperative prognostic indicators.