Trends in utilization of chemotherapy and radiation for resectable gastric adenocarcinoma: An NCDB analysis.

Abstract

163 Background: Locally advanced gastric adenocarcinoma (GACa) is optimally treated with a combination of surgery, chemotherapy (CHEMO) and radiation (RT). Utilization of therapies can vary with institutional practices. Methods: The NCDB was queried for pts with GACa who had RO resection (2006-2012). Pts with metastatic disease, incomplete pathologic staging, and incomplete CHEMO or RT sequencing data were excluded. Pts were divided into groups by treatment regimen: G1: perioperative CHEMO; G2: adjuvant CHEMO±RT; G3: neoadjuvant CHEMORT; G4: other adjunctive regimens; G5: surgery only. Pts who received neoadjuvant therapy were staged using clinical TNM; those who did not or had incomplete clinical staging were staged using pathologic TNM. 3 subsets were created: LOCAL: T0-2N0, LOCALLY ADV: T3-4N0, REGIONAL: N+. Chi-square, univariate, multivariable with stepwise selection, and Cochran-Armitage time trend analyses were performed. Results: N = 12946: G1 = 1099, G2 = 4771, G3 = 180, G4 = 244 and G5 = 6652. The percentage of pts receiving adjunctive therapy was determined for each subset: LOCAL = 17.2%, LOCALLY ADV = 59.8%, and REGIONAL = 66.0%. Use of adjunctive therapy increased from 2006: 44% to 2012: 53% (p < 0.01). Use of perioperative CHEMO increased from 2006: 4% to 2012: 18% (p < 0.01). Factors affecting use of adjunctive therapy on multivariable analysis are: age (p < 0.01), race (p < 0.01), income (p < 0.01), insurance (p < 0.01), comorbidity score (p < 0.01), and facility volume (p = 0.01). Conclusions: Though utilization of adjunctive therapy is increasing, a large proportion of pts with resectable GACa do not receive recommended adjunctive therapy. This study highlights disparities in utilization of optimal multimodality care. National efforts to expand access to care are necessary to improve outcomes in resectable GACa. [Table: see text]