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Mini-review of phase III trial data on sublobar resection for small peripheral NSCLC

Mini-review of phase III trial data on sublobar resection for small peripheral NSCLC
Photo by National Cancer Institute / Unsplash
Key Takeaway
Consider sublobar resection as an acceptable strategy for select patients with stage IA NSCLC ≤2 cm.

This publication is a mini-review that synthesizes evidence from a multicenter phase III trial evaluating sublobar resection versus lobectomy. The study focused on patients with peripheral, clinically node-negative non–small cell lung cancer (NSCLC) measuring 2 cm or less. The sample size for this trial was not reported, and specific follow-up duration was also not reported in the source material.

Key findings indicate that sublobar resection was noninferior regarding disease-free survival, with no specific effect size, absolute numbers, or p-values reported. Furthermore, overall survival and recurrence patterns were described as comparable between the two surgical approaches. No specific adverse events, serious adverse events, or discontinuation rates were reported in the source data.

The authors acknowledge ongoing controversies and identify key gaps requiring future investigation. Practice relevance is established for stage IA NSCLC, where sublobar resection is considered an acceptable and potentially preferable strategy for some patients. The review concludes that while these data support the procedure, secondary and exploratory analyses continue to refine day-to-day clinical decision-making in this setting.

Study Details

Study typeSystematic review
EvidenceLevel 1
PublishedApr 2026
View Original Abstract ↓
The surgical management of early-stage non–small cell lung cancer (NSCLC) has been reshaped by contemporary randomized data supporting lung-sparing approaches in carefully selected patients. CALGB/Alliance 140503, a multicenter phase III trial, compared sublobar resection (wedge or segmentectomy) with lobectomy for peripheral, clinically node-negative NSCLC ≤2 cm, randomizing patients only after rigorous intraoperative nodal assessment. Sublobar resection proved noninferior to lobectomy with respect to disease-free survival, with comparable overall survival and recurrence patterns. Alongside other important randomized trials like JCOG 0802/WJOG 4607L, sublobar resection has now been established as an acceptable – and for some patients preferable – strategy for stage IA (≤ 2 cm) NSCLC. Beyond its primary results, CALGB 140503 has generated a series of secondary and exploratory analyses that continue to refine day-to-day clinical decision-making. This mini-review aims to synthesize the current state of insights from this trial, highlighting ongoing controversies and key gaps for future investigation that will further optimize the management of early-stage NSCLC.
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