title: Collision tumors: pancreatic adenocarcinoma and mantle cell lymphoma.
abstract: BACKGROUND
  Collision tumors are very rare entities composed of two or more distinct tumor components, each separated by normal tissue. Perhaps due to technical advances in the last decade, the incidence of collision tumors has been on the rise. To the best of our knowledge, collision tumors featuring mantle cell lymphoma and pancreatic adenocarcinoma have not been previously described in the scientific literature.
  
  
  METHODS
  For the first time, we describe herein the clinical course of a collision tumor between pancreatic adenocarcinoma and mantle cell lymphoma.
  
  
  CONCLUSIONS
  We hypothesize several aspects in the pathogenesis of a such event and review the existing literature on collision tumors.
authors.affiliation: Department of Hematology-Oncology, St. Francis Hospital and Medical Center. Hartford, CT 06105, USA. c_dasanu@yahoo.com
authors.forename: Constantin A
authors.initials: CA
authors.lastname: Dasanu
authors.forename: Alexei
authors.initials: A
authors.lastname: Shimanovsky
authors.forename: Edyta K
authors.initials: EK
authors.lastname: Rotundo
authors.forename: Anthony F
authors.initials: AF
authors.lastname: Posteraro
authors.forename: Dennis L
authors.initials: DL
authors.lastname: Cooper
authors.forename: Jonessa A
authors.initials: JA
authors.lastname: Atienza
mesh_terms: D000230:Adenocarcinoma / Q000175:diagnosis* / Q000378:metabolism / Q000628:therapy; D000368:Aged; D018395:CA-19-9 Antigen / Q000378:metabolism; D002272:Carcinoembryonic Antigen / Q000378:metabolism; D003937:Diagnosis, Differential; D006801:Humans; D007150:Immunohistochemistry; D053552:Keratin-7 / Q000378:metabolism; D020522:Lymphoma, Mantle-Cell / Q000175:diagnosis* / Q000378:metabolism / Q000628:therapy; D008297:Male; D010190:Pancreatic Neoplasms / Q000175:diagnosis* / Q000378:metabolism / Q000628:therapy
chemical_list: D018395:CA-19-9 Antigen; D002272:Carcinoembryonic Antigen; D053552:Keratin-7