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P1.02 - Poster Session/ Treatment of Localized Disease – NSCLC (ID 209)
- Event: WCLC 2015
- Type: Poster
- Track: Treatment of Localized Disease - NSCLC
- Presentations: 1
- Coordinates: 9/07/2015, 09:30 - 17:00, Exhibit Hall (Hall B+C)
P1.02-007 - The Histologic Subtype of Lung Adenocarcinoma Should Not Deter Sublobar Resection for Patients with Clinical Stage IA Lung Cancer (ID 2516)
09:30 - 17:00 | Author(s): N. Narula
The International Association for the Study of Lung Cancer/American Thoracic Society/European Respiratory Society pathological classification of lung cancer allows for a more comprehensive understanding of the prognostic factors associated with subtypes of lung adenocarcinoma. Micropapillary and solid (MIP/SOL) subtypes have been associated with higher recurrence rates. Some have therefore suggested that sublobar resection (SLR) should be considered a compromise procedure in patients with MIP or SOL tumors. We conducted this study to examine the effect of the resection type [lobectomy (LO) or SLR] on oncological outcomes of patients with MIP/SOL.
A retrospective review of a prospective database (2000-2014) was performed to identify patients with clinical stage IA adenocarcinoma, excluding pure ground glass opacities. Propensity score matching (age, gender, FEV1%, and clinical tumor size) was done to obtain balanced cohorts of patients undergoing LO and SLR. The presence of MIP and/or SOL components (≥5%) was assessed by a single pathologist to avoid inter-observer bias. The SLR group of patients had more comorbidities. Therefore, deaths from causes other than lung cancer were censored and freedom from recurrence was used to assess oncological outcomes. Survival analysis was done using the Kaplan Meier method. Multivariable analysis (MVA) was done using Cox regression.
This study included 300 patients (150 LO vs. 150 SLR, including 77 segmentectomy and 73 wedge resection). Patients undergoing SLR had higher Charlson comorbidity index (P=0.002) and lower DLco% (P=0.01). Patients undergoing LO were more likely to have nodal assessment (99% vs. 85%,P<0.001). Otherwise, no differences in the clinicopathological characteristics were found between the two groups. The presence of ≥5% MIP and/or SOL components was found in 135 patients; LO (58), SLR (77). The 3-year probability of freedom from recurrence in the whole cohort was: MIP (77%), synchronous MIP/SOL (76%), and SOL (61%), compared to 86% freedom from recurrence for other pathological subtypes (median follow-up 41 months). The probability of freedom from recurrence in patients with MIP/SOL subtypes showed a trend favoring the LO group (P=0.092). However, when we excluded patients with SLR with resection margin <1 cm (n=64), there was no difference between LO (80%-72%) and SLR (81%-75%) at 3 and 5 years respectively (P=0.812)(Fig.1). Also, the type of resection (LO/SLR) was not associated with higher recurrence rates in the MVA of the whole cohort. Figure 1
SLR can be safely performed in clinical stage-IA lung adenocarcinoma, regardless of the histological subtype, provided that a resection margin >1 cm is obtained.
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