Gastric metastasis of small cell lung carcinoma: A rare but noteworthy entity to consider

Small cell lung carcinoma (SCLC) is an aggressive malignancy known for its propensity for early and extensive metastatic spread. Gastric metastasis, where cancer cells disseminate from the lung to the stomach, is a rare but increasingly recognized complication of SCLC. This review provides a comprehensive overview of gastric metastasis in SCLC, addressing its clinical significance, diagnostic challenges, management strategies, and prognosis. Additionally, it examines the broader metastatic patterns of SCLC and compares them with other malignancies known for gastric metastasis. Gastric metastasis in SCLC, though infrequent, is clinically significant and often indicates advanced disease with a poor prognosis. SCLC typically metastasizes to the liver, brain, bones, and adrenal glands, with the stomach being an unusual site. The incidence of gastric metastasis ranges from 1% to 5% in autopsy studies, although this may be underestimated due to diagnostic difficulties and asymptomatic early lesions. Diagnosing gastric metastasis presents several challenges, including the asymptomatic nature of many cases, limitations of conventional imaging techniques, and difficulties in distinguishing metastatic lesions from primary gastric cancer via endoscopy. Histopathological diagnosis requires careful examination to identify SCLC cells through their characteristic small cell morphology and neuroendocrine markers. Management of gastric metastasis in SCLC typically involves a multidisciplinary approach. Systemic therapy, primarily chemotherapy, remains the cornerstone of treatment, with palliative care addressing symptoms and complications. Surgical intervention is usually reserved for specific cases requiring symptomatic relief. The prognosis for patients with gastric metastasis from SCLC is generally poor, reflecting the advanced stage of the disease. Median survival is significantly reduced compared to patients without gastric metastasis. This review emphasizes the need for enhanced awareness and early detection to improve patient outcomes and highlights the importance of ongoing research into better diagnostic and therapeutic strategies.