title: Gastrointestinal (GI) leiomyosarcoma (LMS) case series and review on diagnosis, management, and prognosis.
abstract: This review of 76 gastrointestinal (GI) leiomyosarcoma (LMS) cases that include 11 cases from the American University of Beirut Medical Center represents, to our knowledge, the largest number of combined GI LMS cases reported. The age range of GI LMS is variable, and the presentation is non-specific, making pathological diagnosis essential. LMSs usually lack CD117 and CD 34 mutations and are usually positive for smooth muscle cell markers. The review highlights surgery as the mainstay of treatment with negative margins attained most of the times. Adjuvant chemotherapy is used in around 7-27 % of the cases mainly for small intestinal and colorectal LMS. The relatively small number of patients is a limitation on outcome analysis. However, LMS has a risk of recurrence reaching 39-80 % and secondary metastasis reaching 55-71 % in small intestinal and colorectal cases. In light of the high frequency of recurrence and metastasis, enrolling patients in clinical randomized trials to investigate the role of chemotherapy, radiation therapy, and targeted therapy is required for better control of this rare aggressive GI tumor.
authors.affiliation: Department of Radiation Oncology, Naef K. Basile Cancer Institute, American University of Beirut Medical Center, Beirut, Lebanon. Lh54@aub.edu.lb.
authors.forename: Lara
authors.initials: L
authors.lastname: Hilal
authors.affiliation: Gastrointestinal Division, Department of Internal Medicine, American University of Beirut Medical Center, Beirut, Lebanon. Kb02@aub.edu.lb.
authors.forename: Kassem
authors.initials: K
authors.lastname: Barada
authors.affiliation: Department of Internal Medicine, Naef K. Basile Cancer Institute, American University of Beirut Medical Center, Beirut, Lebanon. Dm25@aub.edu.lb.
authors.forename: Deborah
authors.initials: D
authors.lastname: Mukherji
authors.affiliation: Department of Internal Medicine, Naef K. Basile Cancer Institute, American University of Beirut Medical Center, Beirut, Lebanon. st29@aub.edu.lb.
authors.forename: Sally
authors.initials: S
authors.lastname: Temraz
authors.affiliation: Department of Internal Medicine, Naef K. Basile Cancer Institute, American University of Beirut Medical Center, Beirut, Lebanon. as04@aub.edu.lb.|Hematology - Oncology Division, Tumor Registry, P.O.Box: 11-0236, Riad El Solh, Beirut, 110 72020, Lebanon. as04@aub.edu.lb.
authors.forename: Ali
authors.initials: A
authors.lastname: Shamseddine
mesh_terms: D000328:Adult; D000368:Aged; D017024:Chemotherapy, Adjuvant; D005260:Female; D005770:Gastrointestinal Neoplasms / Q000175:diagnosis* / Q000473:pathology / Q000628:therapy*; D006801:Humans; D007890:Leiomyosarcoma / Q000175:diagnosis* / Q000473:pathology / Q000628:therapy*; D008297:Male; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local; D011379:Prognosis
keywords: Intraluminal gastrointestinal; Leiomyosarcoma; Pathological characteristics; Survival outcomes