Abstract
OBJECTIVES: Despite clinical trials supporting the efficacy of segmentectomy for early-stage non-small cell lung cancer (NSCLC), a previous report indicated its limited efficacy in younger patients, raising concerns about its indication. METHODS: Patients aged <70 years with radiologically solid-dominant clinical stage IA NSCLC ≤2 cm who underwent lobectomy or segmentectomy at three institutions between 2010 and 2017 were enrolled. Propensity scores were estimated to adjust for confounding variables (age, sex, smoking history, tumour location, size, ground-glass opacity, maximum standardized uptake value and histological type). To elucidate the prognostic impact of surgical indications in the late postoperative phase, restricted mean survival time (RMST) from 0 to 5 and 8 years was also determined. RESULTS: Overall, 388 patients with a median age of 63 years were enrolled. Overall survival (OS) (hazard ratio [HR], 0.447; 95% confidence interval [CI], 0.152-1.316) and recurrence-free survival (RFS) (HR, 0.638; 95% CI, 0.335-1.216) did not differ significantly between the segmentectomy (n = 114) and lobectomy groups (n = 274). In the propensity score matching of 100 pairs, OS (HR, 0.577; 95% CI, 0.162-2.056) and RFS (HR, 0.945; 95% CI, 0.408-2.191) were comparable between the segmentectomy and lobectomy groups. Regarding OS in the segmentectomy and lobectomy groups, the 5- and 8-year RMST were 4.95 years versus 4.92 years (difference: 0.02 years; 95% CI, -0.09-0.13; P = 0.699) and 7.82 years versus 7.69 years (difference: 0.12 years; 95% CI, -0.17-0.42; P = 0.420), respectively. CONCLUSIONS: Segmentectomy is a viable option for younger patients with early-stage NSCLC, suggesting that indications for segmentectomy need not vary by age.