The IASLC Staging and Prognostic Factors Committee has collected a new database of 94,708 cases donated from 35 sources in 16 countries around the globe. This has now been analysed by our statistical partners at Cancer Research And Biostatistics and, in close collaboration with the members of the committee proposals have been developed for the T, N, and M categories of the 8th edition of the TNM Classification for lung cancer due to be published late 2016. In this publication we describe the methods used to evaluate the resultant Stage groupings and the proposals put forward for the 8th edition.

BACKGROUND: Approved systemic treatments for malignant pleural mesothelioma (MPM) were limited to chemotherapy regimens that have moderate survival benefit with poor outcomes. Nivolumab plus ipilimumab showed clinical benefit in other tumour types, including first-line non-small cell lung cancer. We hypothesised that this regimen would improve overall survival in MPM. METHODS:This open-label phase 3 study was conducted at 103 hospitals across 21 countries. Adults with previously untreated, histologically confirmed unresectable MPM were randomised (1:1) to nivolumab (3 mg/kg intravenously Q2W) plus ipilimumab (1 mg/kg intravenously Q6W) for ≤2 years, or platinum plus pemetrexed chemotherapy (pemetrexed [500 mg/m 2 intravenously] plus cisplatin [75 mg/m 2 intravenously] or carboplatin [AUC 5 mg/mL/min intravenously]) Q3W for up to 6 cycles. The primary endpoint was overall survival (all randomised patients); safety was assessed in all treated patients. This study is registered with ClinicalTrials.gov, NCT02899299. FINDINGS:Between November 29, 2016 and April 18, 2018, 713 patients were enrolled; 303 were randomised to nivolumab plus ipilimumab and 302 to chemotherapy. At the prespecified interim analysis (median follow-up 29•7 months [IQR,[26][27][28][29][30][31][32]), nivolumab plus ipilimumab significantly prolonged overall survival versus chemotherapy. Median overall survival was 18•1 months (95% CI 16•8-21•4) versus 14•1 months (95% CI 12•4-16•2), with a hazard ratio of 0•74 (96•6% CI 0•60-0•91; p=0•0020); 2year overall survival rates were 41% (95% CI 35•1-46•5) and 27% (95% CI 21•9-32•4), respectively.Grade 3-4 treatment-related adverse events were reported in 91 (30%) of 300 patients treated with nivolumab plus ipilimumab and 91 (32%) of 284 treated with chemotherapy. There were three (1%) and one (<1%) treatment-related deaths, respectively. INTERPRETATION:Nivolumab plus ipilimumab provided statistically significant and clinically meaningful improvements in overall survival versus standard-of-care chemotherapy, supporting the use of this first-in-class approved (United States) regimen for previously untreated unresectable MPM.

This article proposes codes for the primary tumor categories of adenocarcinoma in situ (AIS) and minimally invasive adenocarcinoma (MIA) and a uniform way to measure tumor size in part-solid tumors for the eighth edition of the tumor, node, and metastasis classification of lung cancer. In 2011, new entities of AIS, MIA, and lepidic predominant adenocarcinoma were defined, and they were later incorporated into the 2015 World Health Organization classification of lung cancer. To fit these entities into the T component of the staging system, the Tis category is proposed for AIS, with Tis (AIS) specified if it is to be distinguished from squamous cell carcinoma in situ (SCIS), which is to be designated Tis (SCIS). We also propose that MIA be classified as T1mi. Furthermore, the use of the invasive size for T descriptor size follows a recommendation made in three editions of the Union for International Cancer Control tumor, node, and metastasis supplement since 2003. For tumor size, the greatest dimension should be reported both clinically and pathologically. In nonmucinous lung adenocarcinomas, the computed tomography (CT) findings of ground glass versus solid opacities tend to correspond respectively to lepidic versus invasive patterns seen pathologically. However, this correlation is not absolute; so when CT features suggest nonmucinous AIS, MIA, and lepidic predominant adenocarcinoma, the suspected diagnosis and clinical staging should be regarded as a preliminary assessment that is subject to revision after pathologic evaluation of resected specimens. The ability to predict invasive versus noninvasive size on the basis of solid versus ground glass components is not applicable to mucinous AIS, MIA, or invasive mucinous adenocarcinomas because they generally show solid nodules or consolidation on CT.

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