Gastrointestinal Stromal Tumours

Objective: To analyse the gastrointestinal stromal tumours (GIST) patients' inter-demographics, histological type and association with secondary tumours. Study Design: A case series. Place and Duration of the Study: Department of General Surgery, Haydarpasa Numune Training and Research Hospital, Istanbul, Turkey, between January 2010 and December 2018. Methodology: Fifty- eight patients diagnosed with GIST and operated at the study place were analysed retrospectively. The demographics, symptoms, diagnosis, treatment, tumour location, histopathology, risk classification, and prognosis were recorded. Results: The mean age was 60.62 +/- 10.63 (37-83) years and the male to female ratio was 1:1. The most common symptom was abdominal pain (51.7%). Tumour site was the stomach in the majority (86.2%), followed by the small intestine and colon. One patient also had a secondary malignancy. The most common histologic type was spindle cell, followed by mixed cell type. C- kit (CD117) and CD34 mutations were positive in 87.9% and 75.9% of the cases. One patient had liver metastasis on diagnosis and another had peritoneal implants per-operatively, who died after 36 months due to midgut volvulus. The mean followup period was 32.03 +/- 13.67 months. Two patients developed liver metastasis in the early postoperative period. Conclusion: Surgical resection and imatinib treatment have been provided with good prognosis. The most common histology is spindle cell type. GISTs might be associated with other cancers which should be searched and analysed.