Approximately 12,880 individuals are diagnosed with oral cavity or throat cancer in Germany each year. Many tumors often go unnoticed until they reach advanced stages because early symptoms like small wounds, white patches, or rough spots inside the mouth can appear harmless. A newly developed oral cancer test aims to classify suspicious mucosal changes more quickly with just a small brush.
This innovative procedure was developed and tested by a research team led by the Queen Mary University of London. The results were published in the journal Biomarker Research. This test particularly targets oral squamous cell carcinoma, the most common form of mouth cancer, delivering results in less than 60 minutes according to the study.
How the Brush Test for Oral Cancer Works
Traditionally, doctors often had to perform painful biopsies to confirm a cancer suspicion. This invasive procedure can be particularly uncomfortable, especially on the tongue or gums, where teeth and bone lie close beneath the surface. Such invasive methods can lead to bleeding, infections, and significant anxiety for patients facing recurrent procedures.
The new test, however, operates quite differently. Physicians gently brush a sterile brush over the suspicious area in the mouth. In the study, the brush head was rotated ten times to collect mucosal cells. Following this, a PCR method analyzes the sample, seeking a molecular pattern of four specific genes: INHBA, S100A16, YAP1, and POLR2A.
This methodology, termed qMIDSV3, builds on an earlier technique that required a small tissue sample, eliminating the need for incisions. The sample collection took less than five minutes on average in the study, while laboratory analysis required under an hour as per the researchers’ findings.
Reliability of the New Oral Cancer Test
To evaluate the accuracy of the test, the research team analyzed 1,090 brush samples from 545 patients, which included 443 cases of oral squamous cell carcinoma, 63 cases of oral leukoplakia, and 39 cases of oral lichen planus. While leukoplakias can present as white mucosal changes, lichen planus is an inflammatory condition affecting the mucosa.
Each patient provided two samples: one from the suspicious site and another from a similar location in the mouth for comparison. The test computes a malignancy index, designed to reveal whether the sample is more indicative of cancer or a benign alteration. Impressively, the method achieved an accuracy rate of 95.5% in distinguishing between mouth cancer and certain benign or inflammatory mucosal changes. Sensitivity was logged at 95.7% and specificity at 95.1%. However, distinguishing between normal mucosa from the same patient proved to be more challenging, with accuracy around 84%.
A Test That Could Reduce Unnecessary Biopsies
Despite these challenges, the high accuracy rate is vital for practical application. Many suspicious areas in the mouth are benign, yet frequently lead to needless biopsies. The new test could identify low-risk patients at an earlier stage, potentially avoiding over 90% of unnecessary biopsies.
Study leader Muy-Teck Teh, a professor of molecular oral oncology at the Queen Mary University of London, stated, “Survival rates for oral cancer directly correlate with early detection. However, our current diagnostic methods can be quite crude; most patients with suspicious changes end up undergoing invasive biopsies, even when the majority are likely benign.”
Repeatable and Gentle Testing for Oral Cancer Risks
The brush test could play a pivotal role in regular screenings. Certain patients may have persistent mucosal changes that remain harmless for long periods but can develop into cancer cases in some instances. Repeated tissue sampling puts physical and psychological stress on these patients.
As Teh describes, “This test changes the narrative. It provides physicians with a quick, accurate, and non-invasive method to triage patients. Importantly, it can be repeated.” As a result, at-risk patients can be monitored more closely without the burden of repeated tissue excisions.
Currently, qMIDSV3 is not a standard test in clinics or practices. The study represents a diagnostic case-control approach and was based on a patient group from a regional population in Uttar Pradesh, India. The groups considered had differing sizes, and an independent healthy control group was lacking. However, the authors reference previous international data from the UK, India, and China pertaining to the earlier version of the test.
Affordable Testing with Potential for Quick Deployment
This method may prove particularly beneficial in resource-limited regions. The samples remain stable at room temperature, eliminating the need for refrigeration. The analysis utilizes RT-qPCR technology, which has gained widespread adoption following the COVID-19 pandemic. Consumable costs for the procedures are reported to be under ten US dollars per sample.
Researchers are now seeking a commercial partner to further develop the test for clinical use, with a projected rollout within two years. It is worth noting that qMIDSV3 is not designed as a self-test for healthy individuals but rather to assist physicians in cases where suspicious lesions are already present in the mouth.
In Summary:
- A groundbreaking oral cancer test uses a small brush instead of a scalpel, allowing clinicians to collect samples from suspicious areas and analyze them for molecular cancer signals.
- In studies, this test diagnosed oral cancer in less than 60 minutes, achieving an accuracy rate of 95.5% when differentiating between cancerous and specific benign or inflammatory mucosal changes.
- While not yet ready for routine clinical application, this test shows great promise in helping to classify suspicious lesions more rapidly and may save many from unnecessary tissue sampling.
Interestingly: As the brush test aims to clarify suspicious mouth lesions without incisions, researchers are also working on less invasive dental visits. A mini-robot may soon prepare teeth precisely for crowns, ultimately saving patients time—more on this topic in our article.
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