Adjuvant chemotherapy for resected colon cancer: comparison of the prognostic value of tumour and patient related factors

Despite proven benefits of adjuvant chemotherapy in colon cancer, outcomes remain heterogeneous. Several non-validated prognostic factors have been proposed. This study examines the prognostic value of tumour and patient factors currently included in the Numeracy and Adjuvant! models together with measures of the local and systemic inflammatory responses in patients receiving adjuvant chemotherapy for colon cancer. Three hundred and forty-eight patients underwent resection between 1997 and 2007. Of these, 76 received adjuvant chemotherapy. Chemotherapy was 5-FU based (single or combination). Variables from the Numeracy and Adjuvant! calculators were examined. The Petersen Index was used to assess other tumour characteristics considered high risk for recurrence (venous invasion, serosal involvement, surgical margin involvement and perforation through the tumour). Local inflammatory infiltrate was scored by the Jass and Klintrup criteria; the systemic inflammatory response by the Glasgow Prognostic Score (mGPS). Median follow-up was 78 months. Chemotherapy prescription was higher in younger patients with less comorbidity or tumours with higher nodal involvement, increasing T stage and high-risk characteristics (all P