Clinical assessment for the detection of oral cavity cancer and potentially malignant disorders in apparently healthy adults

Tanya Walsh, Saman Warnakulasuriya, Mark W Lingen, Alexander R Kerr, Graham R Ogden, Anne-Marie Glenny, Richard Macey, Tanya Walsh, Saman Warnakulasuriya, Mark W Lingen, Alexander R Kerr, Graham R Ogden, Anne-Marie Glenny, Richard Macey

Abstract

Background: The early detection of oral cavity squamous cell carcinoma (OSCC) and oral potentially malignant disorders (OPMD), followed by appropriate treatment, may improve survival and reduce the risk for malignant transformation respectively. This is an update of a Cochrane Review first published in 2013.

Objectives: To estimate the diagnostic test accuracy of conventional oral examination, vital rinsing, light-based detection, mouth self-examination, remote screening, and biomarkers, used singly or in combination, for the early detection of OPMD or OSCC in apparently healthy adults.

Search methods: Cochrane Oral Health's Information Specialist searched the following databases: Cochrane Oral Health's Trials Register (to 20 October 2020), MEDLINE Ovid (1946 to 20 October 2020), and Embase Ovid (1980 to 20 October 2020). The US National Institutes of Health Trials Registry (ClinicalTrials.gov) and the World Health Organization International Clinical Trials Registry Platform were searched for ongoing trials. No restrictions were placed on the language or date of publication when searching the electronic databases. We conducted citation searches, and screened reference lists of included studies for additional references.

Selection criteria: We selected studies that reported the test accuracy of any of the aforementioned tests in detecting OPMD or OSCC during a screening procedure. Diagnosis of OPMD or OSCC was provided by specialist clinicians or pathologists, or alternatively through follow-up.

Data collection and analysis: Two review authors independently screened titles and abstracts for relevance. Eligibility, data extraction, and quality assessment were carried out by at least two authors independently and in duplicate. Studies were assessed for methodological quality using the Quality Assessment of Diagnostic Accuracy Studies 2 (QUADAS-2). We reported the sensitivity and specificity of the included studies. We provided judgement of the certainty of the evidence using a GRADE assessment.

Main results: We included 18 studies, recruiting 72,202 participants, published between 1986 and 2019. These studies evaluated the diagnostic test accuracy of conventional oral examination (10 studies, none new to this update), mouth self-examination (four studies, two new to this update), and remote screening (three studies, all new to this update). One randomised controlled trial of test accuracy directly evaluated conventional oral examination plus vital rinsing versus conventional oral examination alone. There were no eligible studies evaluating light-based detection or blood or salivary sample analysis (which tests for the presence of biomarkers for OPMD and OSCC). Only one study of conventional oral examination was judged as at overall low risk of bias and overall low concern regarding applicability. Given the clinical heterogeneity of the included studies in terms of the participants recruited, setting, prevalence of the target condition, the application of the index test and reference standard, and the flow and timing of the process, the data could not be pooled within the broader categories of index test. For conventional oral examination (10 studies, 25,568 participants), prevalence in the test accuracy sample ranged from 1% to 51%. For the seven studies with prevalence of 10% or lower, a prevalence more comparable to the general population, the sensitivity estimates were variable, and ranged from 0.50 (95% confidence interval (CI) 0.07 to 0.93) to 0.99 (95% CI 0.97 to 1.00); the specificity estimates were more consistent and ranged from 0.94 (95% CI 0.88 to 0.97) to 0.99 (95% CI 0.98 to 1.00). We judged the overall certainty of the evidence to be low, and downgraded for inconsistency and indirectness. Evidence for mouth self-examination and remote screening was more limited. We judged the overall certainty of the evidence for these index tests to be very low, and downgraded for imprecision, inconsistency, and indirectness. We judged the evidence for vital rinsing (toluidine blue) as an adjunct to conventional oral examination compared to conventional oral examination to be moderate, and downgraded for indirectness as the trial was undertaken in a high-risk population.

Authors' conclusions: There is a lack of high-certainty evidence to support the use of screening programmes for oral cavity cancer and OPMD in the general population. Frontline screeners such as general dentists, dental hygienists, other allied professionals, and community healthcare workers should remain vigilant for signs of OPMD and OSCC.

Conflict of interest statement

Tanya Walsh: none known. I am Statistical Editor for Cochrane Oral Health. Saman Warnakulasuriya: none known. Mark W Lingen: none known. Alexander R Kerr: none known. Graham R Ogden: none known. Anne‐Marie Glenny: none known. I am joint Co‐ordinating Editor of Cochrane Oral Health. Richard Macey: none known.

Copyright © 2021 The Cochrane Collaboration. Published by John Wiley & Sons, Ltd.

Figures

1
1
Study flow diagram.
2
2
Risk of bias and applicability concerns summary: review authors' judgements about each domain for each included study.
3
3
Risk of bias and applicability concerns graph: review authors' judgements about each domain presented as percentages across included studies.
4
4
Forest plot of 1. Conventional oral examination.
5
5
Summary receiver operating characteristic (ROC) plot of 1. Conventional oral examination.
6
6
Forest plot of 2. Mouth self‐examination.
7
7
Summary receiver operating characteristic (ROC) plot of 2. Mouth self‐examination.
8
8
Forest plot of 3. Remote screening (mobile app).
9
9
Summary receiver operating characteristic (ROC) plot of 3. Remote screening (mobile app).
1. Test
1. Test
Conventional oral examination
2. Test
2. Test
Mouth self‐examination
3. Test
3. Test
Remote screening (mobile app)
4. Test
4. Test
Fluorescence

References

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