Recently, a home test for oral and throat cancer was launched in the United States, and it is being marketed directly to the general public, aimed at former or current tobacco users and anyone 50 years or older.
Individuals can order the test – CancerDetect Test for Oral & Throat Cancer – directly from its maker, Viome Life Sciences, for $399.
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People who qualify and buy the test are mailed a saliva collection tube, which they fill and mail back. The company then analyzes the RNA for changes in human cells and the oropharyngeal microbiome that are associated with cancer. During a 15-minute telemedicine conference – included in the $399 cost – those who test positive are told to follow up with a secondary care center for a definitive diagnosis.
For people who test positive but have no visible lesion to biopsy, doctors will likely opt for surveillance, computer scientist Guruduth Banavar, PhD, Viome’s chief technology officer, told this news organization.
Dr. Banavar said people have been buying the test every day since it was launched in early August, but he declined to give specific sales figures.
CancerDetect’s tagline is “test at home for peace of mind.” The test “brings unprecedented accuracy to early cancer detection and prevention,” the company said in a press release announcing the launch.
The test showed an overall specificity of 94% and sensitivity of 84.2%-90% for cancer in Viome’s latest study, which is posted on medRxiv.org as a preprint. Banavar said it has been submitted to a top-tier medical journal.
Viome plans to market CancerDetect “in every possible way” to consumers, including social media, Dr. Banavar said. CancerDetect is not sold on Amazon at the moment, but the company sells another at-home test for gut microbiome plus cellular health on the website.
As for outreach to the medical community, “we will start doing that with dentists first” and then eventually oncologists and other doctors, but “our primary target is to get out to the consumers themselves,” Dr. Banavar said.
Viome’s main goal is to help consumers be proactive regarding their health, he said.
An expert opinion
The marketing push means that sooner or later, oncologists will likely have to deal with a patient who tests positive on CancerDetect, so this news organization turned to numerous experts for their thoughts. None had heard about the test, but one responded with comments.
“I am happy to see industry working on strategies for the early detection of oral and throat cancers,” and CancerDetect has “potential,” said surgical oncologist Saral Mehra, MD, MBA, chief of head and neck surgery at Yale University, New Haven, Conn.
However, after reviewing the study posted on medRxiv, Dr. Mehra advised caution. He said he was concerned about false negative results leading to missed cancers and false positives leading to unnecessary anxiety and testing.
According to the medRxiv preprint, the test was developed and validated using saliva samples from 1,175 people 50 years or older as well as adults with a history of tobacco use.
In the 230-sample validation cohort, CancerDetect correctly classified 18 out of 20 people with oral squamous cell carcinoma (OSCC) and 64/76 with oropharyngeal squamous cell carcinoma (OPSCC), yielding sensitivities of 90% and 84.2%, respectively.
The test also correctly identified 126/134 people as cancer free, for a specificity of 94%.
Results were similar between early and late-stage disease, but mixed in subgroups. Among people younger than age 50, for instance, 4/4 (100%) with OSCC and 2/3 (66.7%) with OPSCC were correctly classified as positive. Among older people, 15/17 (88.2%) with OSCC and 62/73 (84.9%) with OPSCC were correctly classified
Commenting on the results, Dr. Mehra noted that “the power of the study, especially for subgroup analysis, was low,” and investigators “used both advanced-stage and early-stage cancer patients in the model, while the target population for this test is early stage.
“The research needs to be tightened significantly on specific target populations, the models adjusted to really limit false negatives, and a plan [put in place] to act upon positive results,” he said.
Also, the ability of CancerDetect to pick up premalignant lesions – “the greatest value in a screening test” – is not clear, he added.
Viome’s Dr. Banavar said that CancerDetect is in its first iteration, and the test uses machine learning, so its diagnostic performance will improve with the ongoing addition of real-world data.
The company is organizing a pivotal trial to gain formal FDA approval, with results expected in a year and a half or so, he said.
Viome is pushing ahead with its RNA diagnosis technology for the entire range of alimentary canal cancers and disorders, including inflammatory bowel disease. The company has partnered with pharmaceutical companies, including GSK, for vaccines, Dr. Banavar said.
Dr. Mehra reports no relevant financial relationships.
A version of this article first appeared on Medscape.com.