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Systemic treatment options for patients with lung cancer have expanded in recent years, with a number of immunotherapeutic strategies now in our treatment armamentarium. Toxicity of and resistance to treatment hold a major stake in lung cancer morbidity and mortality. Herein, we summarise the background, current evidence and potential mechanisms underlying the role of the commensal gut microbiota in immunotherapy outcomes such as response and toxicity in patients with non-small cell lung cancer (NSCLC).

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451 Background: Small bowel adenocarcinoma (SBA) has a high mortality. Randomised controlled trials are not feasible due to its rarity, therefore there is no gold standard treatment approach. Surgical resection for early stage disease is the only potentially curative option. Systemic therapeutic options are generally extrapolated from oesophagogastric and colorectal chemotherapy regimens. Methods: This is a retrospective review of treatment and outcomes for SBA patients who attended Eastern Health between 1st January 2010 and 30thJune 2015. Approval was obtained from the Eastern Health Human Research and Ethics Committee. Results: Thirty-six patients with SBA were identified: 16 (44%) duodenal, 12 (33%) ampullary, 6 (17%) jejunal, 2 (6%) terminal ileum, 1 not specified. Median age was 72 and 25 (69%) were male. Stage at diagnosis was as follows: Stage 1 = 4 (11%), Stage 2 = 8 (22%), Stage 3 = 9 (25%) and Stage 4 = 10 (28%). Surgery with curative intent occurred in 19 patients (Whipple’s = 13, wide local excision = 6) of whom 6 received adjuvant (predominantly fluoropyrimidine-based) chemotherapy. One patient died from post-operative complications. At last follow-up, 8 patients remained in complete remission; 11 had relapsed; 3 were lost to follow-up. Three patients had died due to disease. Median relapse-free survival in the curative-intent group was 21.4 months. Median overall survival (OS) has not been reached. Sixteen patients were initially treated with palliative intent. Ten underwent palliative surgery (bypass = 7; resection = 3). Overall, 16 patients commenced palliative chemotherapy, including 8 from the curative-intent group post-relapse. The most commonly used regimen was oxaliplatin plus fluoropyrimidine. Best responses to chemotherapy were partial response = 5 (31%) and stable disease = 4 (25%). Six patients received second-line chemotherapy. Median progression-free survival on first-line chemotherapy was 4.8 months. Median OS was 9.4 months. Conclusions: SBA has a poor prognosis. Although 56% of advanced SBA patients had disease control using chemotherapy extrapolated from other gastrointestinal malignancies, responses were not durable.