title: Gastric and prostate adenocarcinoma in a patient with metastatic gastrointestinal stromal tumor.
abstract: BACKGROUND
  Gastrointestinal stromal tumor (GIST) is the most common mesenchymal malignancy of the gastrointestinal tract. Gastric cancer is the second most common neoplasm worldwide. Prostate cancer is the most common non-cutaneous cancer. The most frequently encountered second malignancies in patients with prostate adenocarcinoma include carcinomas of the bladder, stomach, and colon, followed by cutaneous and hematolymphoid malignancies.
  
  
  METHODS
  We report the case of a 60-year-old male patient who was diagnosed with GIST and started on imatinib mesylate 400 mg/day. 2 years later, the patient was diagnosed with gastric adenocarcinoma, and a subtotal gastrectomy and gastrojejunostomy were performed. At followup 6 months later, prostate-specific antigen (PSA) levels were elevated, and a prostate biopsy showed a prostate adenocarcinoma.
  
  
  CONCLUSIONS
  This is the second report of metachronous prostate cancer, gastric cancer, and GIST in the English language literature.
authors.affiliation: Department of Medical Oncology, Gaziantep Oncology Hospital, Gaziantep, Turkey.
authors.forename: M Emin
authors.initials: ME
authors.lastname: Kalender
authors.forename: Alper
authors.initials: A
authors.lastname: Sevinc
authors.forename: Zekeriya
authors.initials: Z
authors.lastname: Kucukdurmaz
authors.forename: Ahmet
authors.initials: A
authors.lastname: Balik
authors.forename: Ibrahim
authors.initials: I
authors.lastname: Sari
authors.forename: Celalettin
authors.initials: C
authors.lastname: Camci
mesh_terms: D046152:Gastrointestinal Stromal Tumors / Q000175:diagnosis*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011471:Prostatic Neoplasms / Q000175:diagnosis* / Q000556:secondary*; D013274:Stomach Neoplasms / Q000175:diagnosis* / Q000556:secondary*