Data Sheet 1_Post-gastrectomy anemia and ferritin dynamics: key determinants of prognosis and clinical management in patients with gastric cancer.doc

ObjectiveThis study identified the trends and clinical significance of anemia and ferritin status 1 year postoperatively in patients with long-term survival and analyzed clinicopathological factors and preoperative nutritional/inflammatory conditions associated with anemia of chronic disease (ACD) development.
MethodsBetween March 2009 and December 2018, 2,976 patients who underwent curative gastrectomy for gastric cancer without recurrence or mortality within postoperative 1 year were included. The patients were categorized into four groups; non-iron deficiency without anemia, iron deficiency without anemia, iron deficiency anemia (IDA), and ACD based on postoperative 1 year ferritin and hemoglobin.
ResultsThe overall incidence of anemia was 36.5% (n=1,086). The prevalence of IDA and ACD was 12.7% (n=377) and 23.8 (n=709), respectively, at postoperative 1 year. Patients with ACD were significantly older, had higher ECOG, increased early complications, and were at a more advanced stage than the other groups. The overall survival (OS) of ACD was significantly lower than that of the other groups (p < 0.001), especially for stages I and III. The presence of ACD was a significant risk factor for overall (hazard ratio [HR] = 1.832, p < 0.001), disease-free (HR= 1.714, p = 0.003), and cancer-specific (HR= 1.690, P = 0.015) survival. Older age, advanced disease stage, low preoperative prognostic nutritional index, preoperative anemia, and early postoperative complications were significant risk factors for ACD.
ConclusionsRelationship between ferritin and Hb at postoperative 1 year is a significant prognostic factor for survival in patients with gastric cancer. Particularly, ACD may be a specific predictor of gastric cancer. Therefore, clinicians need to pay attention to ACD status and prevent the risk factors for its development during long-term postoperative follow-up.