DNA testing kit claims to reveal how you respond to depression drugs

Flickr/Jane
Rahman

• Several companies make DNA tests that claim to tell you
  how well you’ll respond to certain antidepressants based on
  your genetic profile.
• Two personalized medicine companies — Assurex and
  Genomind — offer some of the most popular tests and work with
  physicians and pharmacists to provide them to
  patients.
  
• A chain of Albertsons pharmacies in Chicago,
  Philadelphia, and Boise is running a pilot program in which
  pharmacists can offer the Genomind test.
• Silicon Valley genetics testing startup
  Color Genomics recently began offering a similar test as
  part of its services.
• The costs of the tests range from $250 to $750, but
  some scientists say it’s not worth the money. 

Around the time that 26-year-old Courtney Luk got in line at the
pharmacy to pick up her 25th depression medication, she decided
she’d had enough.

Over the previous two years, Luk had been prescribed everything
from Klonopin to Xanax to treat the anxiety and depression she’d
experienced since adolescence. Nothing seemed to do the trick.
One medication would make her feel numb; others seemed to make
her symptoms worse.

Then a psychiatrist suggested she try a genetic test that could
provide guidance about which drug Luk should try next. They
swabbed the inside of Luk’s cheek for a spit sample and sent it
off to get tested.

Using DNA testing to determine how well a given depression
medication will work with a patient’s genetic makeup is becoming
a popular approach. More than 750,000 people have taken one such
test, called GeneSight, which is made by personalized medicine
company Assurex, according to its website. A network of 28
Albertsons pharmacies offers a similar test made by a company
called Genomind as part of a pilot program. And just last month,
Silicon Valley genetics testing startup Color
Genomics began offering a test as part of its $250 kits.

But some scientists say the tests have limited utility.

That’s because they doesn’t tell providers which specific
medication is best to prescribe patients, according to Alan
Schatzberg, a Stanford University psychiatrist. And Cristina
Cusin, a Harvard psychiatrist, said the test won’t give helpful
results to patients who take more than one medication.

Plus, the tests may give conflicting results to the same patient
for the same medication, according to a peer-reviewed
analysis of four different gene tests published this summer.

A pricey test with a lofty goal

Getty Images/William Thomas
Cain

Since adolescence, Luk had experienced debilitating anxiety that
sometimes turned into panic attacks, along with mood swings and
depression that sometimes led her to contemplate taking her own
life. Despite trying more than two dozen different medications,
Luk and her psychiatrists had yet to come up with a combination
of drugs that significantly lifted her mood without contributing
to her anxiety.

Luk had heard of genetics tests for antidepressants before, but
previously declined to take one since she couldn’t afford the
$750 price tag.

But when a psychiatrist suggested a test she could get for free
through insurance, a kit from Genomind called the Genecept Assay,
Luk said yes. The test appealed to her as a potential way to
eliminate the trial-and-error process of starting a new drug and
waiting — sometimes up to six weeks, the standard for most
antidepressants — to see if it worked.

“I don’t feel like my medications right now are working
optimally, and I was hoping to learn if there’s a cocktail of
medications that would do that,” Luk said.

Her psychiatrist told her the test might show them what to do
next. Perhaps they’d learn that one medication wasn’t right for
her body and could be replaced with a different drug. But when
the results came in, they were murkier than Luk anticipated.

Her report listed all the antidepressants she’d taken along with
several she’d yet to try. Each got a colored check mark: red
checks suggested Luk would likely have negative reactions to a
drug, green checks suggested no negative reactions, and orange
checks indicated something in between.

Next to a popular antidepressant called Celexa, for example,
Luk’s test showed an orange check mark and said, “increased risk
for adverse events or poor response.” That meant that because of
the way her body processed the drug, Luk was more likely than the
average person to experience negative side effects or see no
positive results.

Sure enough, Luk recalled that when she’d taken Celexa several
years earlier, she had experienced painful bruising across her
arms and legs.

But another drug Luk had recently begun taking, called Topamax,
carried a green check and said “use as directed — no known
gene-drug interactions.” Despite taking that medication for
several weeks, however, Luk said she hadn’t experienced any
change in her symptoms.

So she went back to trial and error.

Daniel Dowd, Genomind’s vice president of medical affairs,
acknowledged that some patients may read too much into the test.

“I think patients do tend to think, ‘OK, this is going say
exactly what this specific drug is going to do for me,’ and
that’s not what this test is,” Dowd told Business Insider. “Like
any other branch of medicine, [the test] provides an estimation
of risk.”

Genomind funded a 2018
study of its test that analyzed patient spending in
the six-month period following use of the test. The authors — one
of whom sits on Genomind’s scientific advisory board — compared
roughly 800 people with mood and anxiety disorders who took the
test with nearly 3,000 people who didn’t take it. They found that
people who took the test spent nearly $2,000 less on healthcare
on average, mostly because they visited ERs and hospitals less
frequently in the months following the test than people who
didn’t take it.

The researchers wrote that it could represent “a promising
strategy to reduce costs” in people with depression and
anxiety.  

To Dowd, the finding was a big endorsement of the test.

“If we can get this test embedded in the healthcare record, that
could mean a big cost savings,” he said.

Who the test may — and may not — help

Once you swallow a pill, various genes control how your body will
break it down. One gene in particular, called CYP2D6, is one
of the most
closely studied. Some people have faulty or abnormal copies
of that gene, meaning they don’t process drugs like
antidepressants as they should. That increases the chances that
someone could have an adverse reaction like bruising or not
respond to a medication at all.

The gene tests are designed to assess whether a patient is likely
to have a negative outcome on any common antidepressants. In
theory, that would help patients and their providers narrow down
the list of potential medications to try.

“In these cases, I think there is clear evidence” for using
a gene test, Michelle Whirl-Carrillo, a senior research scientist
at the Stanford University School of Medicine, told
the author of an article published by the Journal of the American
Medical Association (JAMA). 

But Schatzberg, the Stanford psychiatrist, said a narrower list
is not what his patients need.

“What’s really needed is a test that says, ‘You have this
profile, these are the two drugs you need to use.’ That’s what’s
missing,” he said.

Instead, the tests merely tell him if someone’s body doesn’t
process a drug properly — a conclusion they’d reach anyway after
trial and error.

“I don’t need to know if a person is a poor drug metabolizer. I
need to know what drug to use where I’m going to get the positive
effect,” Schatzberg said. “These tests don’t do that.”

perfectlab/Shutterstock

Cusin, the Harvard psychiatrist, specializes in treating people
with severe depression. She agreed with Schatzberg.

“I don’t think psychiatrists get much information about the costs
and benefits or much predictive value for this type of test,” she
said.

Cusin added that she doesn’t think the test helps in cases where
people are taking multiple medications or when patients have a
history of failing to respond to medications. Plus, she said, a
recent study made her hesitant to use the tests in her own
practice.

That study found
major inconsistencies among four different gene tests (including
Genomind’s). In roughly one out of five cases, the authors said,
different tests gave conflicting advice to the same patient.

“The level of disagreement in medication recommendations …
indicates that these tests cannot be assumed to be equivalent or
interchangeable,” the researchers wrote.

‘I jumped on it because I was tired of trial and error’

iviewfinder/Shutterstock

Unlike Luk, Allyson Byers, a 27-year-old in Los Angeles, said
taking a genetic test saved her time in the quest to find the
right medication.

Byers took Assurex’s GeneSight test after trying several drugs
for her depression. 

“I jumped on it because I was tired of trial and error,” she told
Business Insider.

Byers said she paid $60 for the test after talking with her
therapist and an Assurex representative (though she initially
received a bill for several hundred dollars).

Her results weren’t perfect. Byers had been taking the
antidepressant Zoloft for nine months, but she experienced
several negative side effects, including weight gain. On the
Assurex test, however, Zoloft was green-lit.

“When the results came back, I was questioning myself and
thinking, ‘Did I make that all up? Did I really gain weight?'”

But the test also suggested another medication called Pristiq
that Byers had not previously taken, she said. So Byers’
therapist suggested they try that instead of Zoloft. Several
weeks later, Byers said she felt better — and thanked the test
for helping her find a different medication.

“I’ve had to go up in dose a couple times, but I feel like I’ve
finally found the right dose,” she said. For her, the test
was “just another tool to help narrow things down.”

Coming to a pharmacy near you?

AP
Photo/Paul Sakuma

Increasingly, some patients are learning about genetics tests for
antidepressants from their pharmacist instead of a psychiatrist.

In Chicago, Boise, and Philadelphia, 28 Albertsons drug stores
are offering the Genomind test, according to Kimberly Hecht,
a patient care services coordinator with Albertsons who leads the
project.

She told Business Insider that mental health became a
focus at the pharmacies she oversees when they began
offering medications for drug addiction. Plus, because
Albertsons’ pharmacies are open longer and on more days of the
week than others nearby, they sometimes function as a default
mental health provider, Hecht said.

“It just made sense with what we were offering and also because
of our position in the community,” Jennifer Rapley, a marketing
manager with Albertsons who works closely with Hecht, told
Business Insider.

The project is currently in a pilot phase, but Genomind hopes to
eventually offer its gene test in all 1,760 Albertsons-owned
pharmacies throughout the country, JAMA
reported this month.

But some components of the Albertsons program — such as how
pharmacists determine whether a patient is a good candidate for
the test and how it evaluates whether the results are effective —
remain hazy.

For example, a patient does not have to have a history of using
antidepressants to be offered the test, Hecht said.

“Typically it’s going to be patients who’ve tried a couple
different things and it’s not working, but we kind of leave it up
to our pharmacists’ professional judgment,” she said.

That makes Schatzberg wary. 

“I think it presents real problems,” he said. “It’s practicing a
level of medicine and offering a test where it’s not clear
whether and how it should be used. It’s hard for me to believe
that’s a good idea.”

The future of genetic testing for depression

Last month, Silicon Valley genetics testing startup
Color Genomics began offering a test for antidepressants as a
component of its DNA tests,
which screen for gene variations linked to cancer and heart
disease. Color’s service includes a professional genetics
counselor who walks a patient through their results.