• 3/18/2005
  • Jon Sudbø et al.
  • Journal of Clinical Oncology, Vol 23, No 9 (March 20), 2005: pp. 1927-1933

Purpose:
Quitting smoking may prevent oral cancer. Behavioral intervention to quit smoking may be more efficient if persons are assigned an individual risk of cancer.

Patients and Methods:
In this prospective study, we provided counseling and behavioral intervention toward smoking cessation, supplemented by genetic analyses in clinically normal oral mucosa of heavy smokers. Measurement of serum cotinine was used to assess changes in smoking habits.

Results:
In cytologic scrapings from 275 heavy smokers with clinically normal mucosa, we found tetraploidy in four and aneuploidy in 19 persons (23 of 275; 8%). Twenty one (91%) of 23 persons with aneuploidy had quit or reduced their smoking habits at the 3-month follow-up, 20 (87%) of 23 persons had done so at 12 months, and 21 (91%) of 23 persons had done so at 24 months. Fifty-one (20%) of the 252 persons without genetic changes in their mucosa had quit or reduced their tobacco habits at the 3-month follow-up, 23 (9%) had done so at 12 months, and 17 (7%) had done so at 24 months (P < .001). After 24 months, normalization of DNA content to diploidy was observed in two of four persons with tetraploid (50%), and in 11 of 19 persons (58%) with aneuploid scrapings. One patient developed an oral carcinoma in the floor of the mouth: this patient had an aneuploid scraping obtained 43 months earlier and developed a leukoplakia 28 months before the carcinoma.

Conclusion:
Risk markers of oral cancer are present in clinically normal mucosa of heavy smokers, and such findings enhance the adherence to smoking cessation on counseling. Cytogenetic aberrations may normalize after quitting smoking.

Authors:
Jon Sudbø, Roy Samuelsson, Björn Risberg, Stig Heistein, Christian Nyhus, Margaretha Samuelsson, Ruth Puntervold, Eva Sigstad, Ben Davidson, Albrecht Reith, Åsmund Berner

Authors’ Affiliations:

Department of Medical Oncology and Radiotherapy, Division of Cytology; Department of Pathology, The Norwegian Radium Hospital; and Dental Faculty, University of Oslo; and Årvoll Tannhelse AS, Oslo, Norway