RT Journal Article SR Electronic T1 Small Cell Lung Carcinoma and Synchronous Rectal Adenocarcinoma and Jejunal Gastrointestinal Stromal Tumor Present in a Patient With History of Laryngeal Squamous Cell Carcinoma JF Anticancer Research JO Anticancer Res FD International Institute of Anticancer Research SP 7053 OP 7056 DO 10.21873/anticanres.14732 VO 40 IS 12 A1 BOWEI LIU A1 SHARON SHIRAGA A1 MELINDA M. MORTENSON A1 JINPING LAI YR 2020 UL http://ar.iiarjournals.org/content/40/12/7053.abstract AB Background: The synchronous diagnosis of two or more primary malignancies in a patient is overall rare. Case Report: We report such a case of a 67-year-old male smoker with a history of laryngeal squamous cell carcinoma. He was incidentally identified through follow up computed tomography to have three masses in the lung, rectum and jejunum, respectively. Biopsies were performed and demonstrated synchronous lung small cell carcinoma (pT1bN0) and rectal adenocarcinoma. The patient underwent fractionated stereotactic radiation (FSRT) to the pulmonary tumor and chemotherapy with cisplatin and etoposide followed by laparoscopic rectum low anterior resection and small bowel segmental resection. Final pathology diagnoses confirmed synchronous microsatellite stable (MMS) moderately differentiated adenocarcinoma of the rectum (pT3N1b) and jejunal gastrointestinal stromal tumor (GIST), spindle cell type (pT2N0). At 8 months follow up postsurgery, the patient was doing well and no tumor recurrences were identified. Conclusion: To the best of our knowledge, this is the first documented case of synchronous primary small cell lung carcinoma, rectal adenocarcinoma, and GIST in the English literature. The rarity, diagnosis and treatment challenges of these entities are discussed.