Medical Laboratory Screening Tests for Inherited Genetic Disorders Gain Popularity Amid Global Genetic Testing Market Double-Digit Revenue Growth
Lack of Medicare or third-party payer coverage for most genetic screening tests in healthy adults is not discouraging development of new gene testing products
With the global anatomic pathology genetic testing market poised to reach $9.8 billion by 2025, clinical laboratories continue to develop new genetic screening tests (rather than diagnostic tests) intended to help physicians identify patients who carry inherited genetic mutations that could put them or their future children at higher risk for chronic disease, such as cancer.
This is a bit of a gamble since (with some exceptions) Medicare and many health insurers typically will not pay for predictive and presymptomatic genetic tests and services used to detect an undiagnosed disease or disease predisposition.
Nevertheless, Inkwood Research of Gurugram, India, predicts in its “Global Genetic Testing Market Forecast 2017-2024” report that aging populations throughout the world will be the driving force producing “enormous opportunities for the global genetic testing market.” The research firm anticipates this will result in a 9.93% increase in annual sales revenue during each of the next seven years.
Screening versus Diagnostic Testing Gains Popularity Among Patients, Physicians
Genetic diagnostic testing promises to accelerate the growth of precision medicine by guiding the diagnosis and treatment of cancer and other chronic diseases. However, genetic tests that “screen” healthy patients for predispositions to certain diseases also are gaining traction in the marketplace.
The US Food and Drug Administration (FDA) gave direct-to-consumer genetic screening testing a boost in April 2017 when it allowed marketing of 23andMe Personal Genome Service Genetic Health Risk tests for 10 inherited diseases or conditions, including:
· Parkinson’s Disease;
· Late-onset Alzheimer’s Disease;
· Celiac Disease; and
· other conditions.
“Consumers can now have direct access to certain genetic risk information,” Jeffrey Shuren, MD, Director of the FDA’s Center for Devices and Radiological Health, said in a press release. “But it is important that people understand that genetic risk is just one piece of the bigger puzzle, it does not mean they will or won’t ultimately develop a disease.”
“Some people really want this [genetic] information on their own, and others want it through their physician,” Green said. “Both those channels are legitimate. People should just be aware that this information is complicated.”One example of genetic screening tests is the Quest Diagnostics (NYSE:DGX) QHerit Pan-Ethnic Expanded Carrier Screen, which offers couples the opportunity to test for 22 genetic diseases that could be passed on to their children, including:
· Cystic Fibrosis;
· Sickle Cell Disease; and
· Spinal Muscular Atrophy.
The genetic screening panel tests for the 22 heritable diseases cited by the American College of Obstetricians and Gynecologists (ACOG) in a Committee Opinion on genetic carrier screenings published by the ACOG in March 2017.
“The United States is truly a melting pot, and it no longer makes sense for physicians to assume genetic screening is appropriate for an individual based on presumed race or ethnicity,” Felicitas Lacbawan, MD, Executive Medical Director, Advanced Diagnostics, Quest Diagnostics, stated in a press release. “QHerit is designed for any woman and her partner, not just those in a specific, so-called high-risk ethnic or racial group.”
Genetic Screening in Primary Care Helps Assess Risk for Chronic Disease
Genetic diagnostic test developer Invitae (NYSE:NVTA) also points to growing evidence of the genetic screening test’s value to healthy individuals. In September 2017, Invitae presented initial findings at the National Society of Genetic Counselors 36th Annual Conference. The study showed a retrospective analysis of 120 patients tested with a proactive genetic screening panel for healthy adults had revealed medically significant findings for nearly one in five patients.
“Interest among otherwise healthy adults in using genetic information to understand their risk of disease conditions continues to grow each year, ” Robert Nussbaum, MD, Chief Medical Officer of Invitae, said in a press release. “These and other data show that interest is well-placed, with a substantial group of patients showing genetic variants associated with elevated risk of diseases like cancer where monitoring and early intervention can be helpful. Use of genetic screening in the primary care setting can assess risk to help shape individual screening plans. We are continually adding tools and resources that help reduce barriers to the widespread use of genetic information in mainstream medical practice.”
Routine Genetic Screening Could Become Norm, CDC Says
The Centers for Disease Control and Prevention (CDC) notes that newborn screening is “currently the largest public health genetics program in the world,” with more than four million babies screened at birth each year for 30 or more genetic conditions. In the CDC’s “Genomics and Health Impact Blog,” the agency continues to maintain a “cautionary attitude about personal genomic tests” beyond the newborn period, directing those considering direct-to-consumer laboratory testing, such as 23andMe and MyMedLab, to “think before you spit.”
Nonetheless, the CDC acknowledges routine genetic screening of healthy people could become the norm. However, others advise caution.
“To be sure, while the use of genome sequencing is promising in certain clinical scenarios, such as rare diseases and cancer, we do not think that whole genome sequencing in the general population is appropriate at this time,” Muin J. Khoury, PhD, MD, Director, Office of Public Health Genomics, CDC, wrote in a January 30, 2017, blog post. “We would not recommend its use outside research studies … But it is also becoming clearer that as science progresses, we are discovering more opportunities for using genetic screening of healthy individuals for preventing common diseases across the lifespan, outside of the newborn screening context.”
The impact on clinical laboratories and anatomic pathology groups should genetic screening become normalized should be clear: Labs will be tasked with performing these tests, and pathologists will be needed to interpret them and educate both physicians and patients on the findings.
Before that, however, genetic screening tests will need to be fully supported by government, and insurers, including Medicare, will have to agree to pay for them.
—Andrea Downing Peck