Assessing the usefulness of three adjunctive diagnostic devices for oral cancer screening: a probabilistic approach


  • This paper was presented at a meeting: The contents of this manuscript were presented as an abstract at the 2nd World Congress of Oral Oncology in Toronto Ontario July 11, 2009. [Journal of Oral Oncology-Supplement 2009 3:230-31)].

Ben Balevi, Faculty of Medicine, University of British Columbia, #306 – 805 West Broadway, Vancouver, BC V5Z 1K1, Canada


Balevi B. Assessing the usefulness of three adjunctive diagnostic devices for oral cancer screening: a probabilistic approach. Community Dent Oral Epidemiol 2011; 39: 171–176. © 2010 John Wiley & Sons A/S

Abstract –  Background and objective:  Visually distinguishing oral cancer from noncancerous oral lesions is problematic. Currently, commercial diagnostic devices are being marketed to dentists as effective screening devices to use in general practice. The purpose of this study is to evaluate the probabilistic performance of VELscope®, Oral CDx® and toludine blue staining as clinical adjunctive diagnostic procedures in routine screening for oral cancer in dental practice.

Materials and methods:  Sensitivity and specificity information for each device was taken from the literature. The positive predictive value (PPV) and false positive rate, based on three clinical screening scenario, were calculated using Bayes’ Theorem.

Results:  Under three clinical scenarios (screening the general population, screening only adults (≥40 years) and screening adults (≥40 years) that present with intra-oral visible lesions), VELscope produced the highest PPV’s of 1.27%, 2.53% and 8.11%, respectively. This indicates a false positive rate of between 91.89% and 98.73%.

Conclusion:  VELscope, OralCDx and toludine blue staining have high false positive rates when they are used to screen routinely for oral cancer. It would be inefficient to allocate scarce healthcare resources to the routine use of these devices for oral cancer screening. These devices may be beneficial in opportunistic screening programmes or in cancer referral clinics when the pretest probability of oral cancer is likely to be above 10%. Further research is needed to determine at which pretest probabilities these adjunctive diagnostic devices would be cost-beneficial for the screening of oral cancer.