Understanding gastric metastasis of small cell lung carcinoma: Insights from case reports and clinical implications

Small cell lung cancer (SCLC) is a common type of primary lung cancer that contributes to approximately 15% of cases. It is closely associated with tobacco risk factors. It is also known as a type of lung cancer that has a high mortality rate within a short time due to its rapid growth rate (with tumor doubling time of 30 days) and its tendency to metastasize early in the disease process. The primary sites of metastasis in SCLC are similar to those in other primary lung cancers and often include the brain, bones, adrenal glands, liver, and lymph nodes. However, there are a few clinical reports of uncommon metastases, such as gastric metastasis from SCLC. Although the incidence of this clinical presentation is very low, reported cases have generally resulted in early mortality due to inadequate treatment. The purpose of this letter is to discuss the knowledge related to gastric metastasis from SCLC and remind clinical doctors not to miss atypical symptoms, thereby providing the right attitude to improve the prognosis for these patients.