NGS Testing Hits Clinical Practice

Meir Rinde
Published: Monday, Feb 19, 2018
David S. Klimstra, MD
David S. Klimstra, MD
The use of next-generation sequencing (NGS) to diagnose cancers and guide therapy decisions is expanding as more therapies are linked to genomic abnormalities. But advances in molecular testing face headwinds in the near term as clinicians struggle to manage the wealth of data produced by tests and payers balk at covering expensive assays backed by sparse evidence for improved outcomes.

 

Figure. FDA's Approach to NGS Tumor-Profiling Tests

FDA's Approach to NGS
However, the federal review process also underscores the hurdles that laboratories face as they seek broader acceptance of their products. Although testing companies and oncologists have applauded CMS for addressing the question of NGS coverage, many have also expressed dismay at the accompanying restrictions. Under the draft policy, CMS would only pay for tests that are FDA approved or cleared or are being used in National Cancer Institute-sponsored trials and would not cover retesting using the same test, among other limitations.1 A decision is due February 28, 2018.

 

Table. FDA-Approved NGS Tumor-Profiling Tests

FDA-Approved NGS
“What it would basically do is deny payment for the vast majority of assays currently being offered, unless they follow our lead and obtain FDA clearance. Even then, it’s a rather restrictive subset of cancer types that would be covered,” said David S. Klimstra, MD, chair of the Department of Pathology at MSK. He said he is also concerned that CMS’ proposed policy would essentially expand FDA authority over the assays without the usual congressional oversight. Such assays are currently considered laboratory-developed tests (LDTs) that do not need FDA approval.

“The draft policy is also only directed toward next-generation sequencing assays,” Klimstra noted. “CMS would continue to support existing payment structures for single-gene assays, which are less broad-spectrum, less tissueefficient, and less sensitive, but it would refuse to pay for the best assays out there. In a sense, that is a clear step backward.”

Rising Demand for Panel Testing

The dominant technologies for molecular marker testing include immunohistochemistry, fluorescence in situ hybridization, and NGS methods. Use of all of these types of assays is increasing due to the expansion of targeted therapies, but the number of multigene NGS tests ordered annually appears to be rising particularly quickly. NGS assays represented 27% of molecular tests in the National Institutes of Health’s Genetic Testing Registry in February 2016, up from 10% 2 years earlier.2 Panels of at least 5 genes accounted for 16% of NGS tests. In addition, the number of oncology genetic tests of all types in the registry had jumped 153% over 12 months.


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