Impact of High-Grade Patterns in Early-Stage Lung Adenocarcinoma: A Multicentric Analysis
Pietro Bertoglio # 1 , Vittorio Aprile # 2 , Luigi Ventura 3 4 , Maria Cattoni 5 , Dania Nachira 6 , Filippo Lococo 6 , Maria Rodriguez Perez 7 , Francesco Guerrera 8 , Fabrizio Minervini 9 , Giulia Querzoli 10 , Giovanni Bocchialini 3 , Diana Bacchin 11 , Francesca Franzi 12 , Guido Rindi 13 , Salvatore Bellafiore 14 , Federico Femia 8 , Giuseppe Salvatore Bogina 10 , Piergiorgio Solli 1 , Peter Kestenholz 9 , Enrico Ruffini 8 , Massimiliano Paci 15 , Stefano Margaritora 6 , Andrea Selenito Imperatori 5 , Marco Lucchi 11 , Letizia Gnetti 16 , Alberto Claudio Terzi 17
Objective: The presence of micropapillary and solid adenocarcinoma patterns leads to a worse survival and a significantly higher tendency to recur. This study aims to assess the impact of pT descriptor combined with the presence of high-grade components on long-term outcomes in early-stage lung adenocarcinomas.
Methods: We retrospectively collected data of consecutive resected pT1-T3N0 lung adenocarcinoma from nine European Thoracic Centers. All patients who underwent a radical resection with lymph-node dissection between 2014 and 2017 were included. Differences in Overall Survival (OS) and Disease-Free Survival (DFS) and possible prognostic factors associated with outcomes were evaluated also after performing a propensity score matching to compare tumors containing non-high-grade and high-grade patterns.
Results: Among 607 patients, the majority were male and received a lobectomy. At least one high-grade histological pattern was seen in 230 cases (37.9%), of which 169 solid and 75 micropapillary. T1a-b-c without high-grade pattern had a significant better prognosis compared to T1a-b-c with high-grade pattern (p = 0.020), but the latter had similar OS compared to T2a (p = 0.277). Concurrently, T1a-b-c without micropapillary or solid patterns had a significantly better DFS compared to those with high-grade patterns (p = 0.034), and it was similar to T2a (p = 0.839). Multivariable analysis confirms the role of T descriptor according to high-grade pattern both for OS (p = 0.024; HR 1.285 95% CI 1.033-1.599) and DFS (p = 0.003; HR 1.196, 95% CI 1.054-1.344, respectively). These results were confirmed after the propensity score matching analysis.
Conclusions: pT1 lung adenocarcinomas with a high-grade component have similar prognosis of pT2a tumors.