Late term renal complications related to chemoradiotherapy in patients with gastric cancer

Abstract

15033 Background: The aim of this study is to evaluate late term renal complications of the combined treatment with chemoradiotherapy, according to the scheme of McDonald et al, in patients diagnosed with gastric cancer, after radical curative surgery. Methods: Totally 44 patients who administered to our clinic between years 2003 and 2004, with the diagnosis of gastric cancer, and with the age-adjusted creatinine clearance test (CCT) results within normal range, were enrolled into the study. Surgical procedure was subtotal gastrectomy in 34 patients (63,6%), and total gastrectomy in 16 patients (36,4%). Total 4600 cGy radiotherapy was administered to all patients through parallel-opposed AP-PA fields in 23 fractions concomitant with chemotherapy according to the scheme of McDonald et al. One year after the completion of the treatment, a technetium 99-m renal scintigraphy (DMSA) and CCT were performed to all patients whose renal functions were within normal limits. Results: Median age in the study was 52 (22–78). 34 patients (77,3%) were male and 10 (22,7%) were female. TNM stages were stage II in 15 (34,1%), IIIA in 21 (47,7%), IIIB in 4 (9,1%), and IV in 4 cases (9,1%). CCT measured 1 year after the treatment was low in 13 patients (29,6%), and within normal range in 31 patients (70,4%). Renal scintigraphy revealed damage at one pole in 32 patients (72,7%), damage at bilateral renal poles in 8 patients (18,3%), and it was normal in 4 patients (9%). Renal damage was higher in left kidneys than right kidneys (89,9% vs. 15,4%). There was a correlation between CCT values and scintigraphical findings. Damage in bilateral renal poles was higher in cases with low CCT than in cases with normal values (85,7% vs. 15,4). In general, there were no statistically significant relationship between late term renal complications and sex, and grade III treatment-related gastrointestinal toxicity. However, the relationships with age, extent of surgery reached statistical significance (p=0.009, and =0.006). Renal damage was notably higher in older patients, and in patients who underwent total gastrectomy. Conclusions: Since postoperative chemoradiotherapy is a novel modality for the treatment of gastric cancer, more studies are required in order to evaluate chronic toxicities. No significant financial relationships to disclose.