title: Role of extended histological examination in the assessment of local recurrence of tongue and floor of the mouth cancer.
abstract: OBJECTIVE
  The aim is to find out why the rate of recurrence of tongue and floor of the mouth cancer is so high despite radical surgical treatment combined with radiochemotherapy.
  
  
  BACKGROUND
  Oropharyngeal cancer is the second most common head and neck cancer in Poland. Tongue cancers account for 40% of all oral cavity tumours. A frequent reason for a failure in treatment of tongue and floor of the mouth cancers is local recurrence. Based on that examination, cancer treatment can be precisely planned.
  
  
  METHODS
  The study comprised a group of 56 tongue and floor of the mouth cancer patients. 9 patients who showed local recurrence were given an extended histopathological examination. The infiltration of the vessels, nerves and muscles was examined. The examination also checked the largest dimension of the tumour, the greatest depth of invasion from the mucous membrane, invasive front of the cancer, vessel embolisms, intra- and perineural infiltrations in the cancer invasive front. Tumour aggressiveness was assessed according to M. Brandwein-Gensler.
  
  
  RESULTS
  In five patients, primary tumours were found to be histologically aggressive as indicated by the infiltration of the vessels, nerves and muscles. Tumours which penetrate these structures were characterized with peri- and intraneural infiltration and were correlated with the depth of invasion from the mucous membrane, the occurrence of embolisms, and a high risk assessment as proposed by M. Brandwein-Gensler.
  
  
  CONCLUSIONS
  The progression of cancer depends strongly on histopathological traits. The incidence of penetration of the vessels, nerves and muscles correlates with aggressiveness of the tumour front.
authors.affiliation: Head and Neck Surgery and Laryngological Oncology Department, Greater Poland Cancer Centre, Poland.
authors.forename: Bartosz
authors.initials: B
authors.lastname: Szybiak
authors.affiliation: Cancer Pathology Department, Greater Poland Cancer Centre, Poland.
authors.forename: Paweł
authors.initials: P
authors.lastname: Trzeciak
authors.affiliation: Head and Neck Surgery and Laryngological Oncology Department, Greater Poland Cancer Centre, Poland ; Poznan University of Medical Sciences, Poland.
authors.forename: Wojciech
authors.initials: W
authors.lastname: Golusiński
keywords: Histopathological examination; Recurrence; Tongue cancer