Why Isn’t Medicine One Size Fits All?

Precision medicine explained: Breaking down how this unique approach and commitment could fundamentally change how we treat disease.

The age of precision medicine

Within AbbVie’s walls, a team of nearly 200 researchers around the globe are focused on untangling the complex nature of disease. They’re in the clinic, working to identify biomarkers used to provide insights into the effects of therapies on disease, as well as determine which patients may respond to therapies.

This key area of innovation is called precision medicine, or “PMed,” spearheaded by Ian McCaffery, Ph.D.

"We’re now at a point where we can understand the drivers of disease and target them with highly selective therapies,” says McCaffery. “The age of precision medicine is upon us, where using genetic and other molecular data, and ultimately companion diagnostic tests, can help us target medicines to patients who we think could respond to them."

The company’s tools and expertise continue to advance critical work in precision medicine, with understanding genetic variation serving as a fundamental building block.

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Why isn’t medicine one size fits all?

Precision medicine, explained

Why isn’t medicine one size fits all?

Precision medicine, explained

Filling in the genetic gaps

Let’s rewind to see how genetic variation plays a key role in precision medicine. In the 1990s, scientists from all over the world set out to map the first human genome, helping us understand what makes us human at the molecular level.

Fast forward to today: News recently broke that the human genome had finally been fully sequenced. These discoveries filled in 8% of the missing map — what amounted to 200 million missing base pairs of DNA.

Besides teaching us about what makes us tall, what could make us live longer, and what helps dictate whether we’ll be future Olympians, genes can tell us how we’ll respond to medicines on a molecular level — and we’re already seeing some of the results of that today through a tailored approach to science and medicine called precision medicine.

How do genetics play into precision medicine?

Now let’s back up a bit more to understand the human genome.

Your genome is  you: More than 3 billion basepairs of DNA that live in all of your cells. If you stretched out the DNA in just one cell, it would measure about two meters tall.

Even though we’re made of 3 billion base pairs of DNA, humans are still, genetically, 99.9%2  identical. It’s that last 0.1% that dictates what makes us unique, whether that’s to indicate if we’ll be tall enough to dunk a basketball, or how our bodies respond to certain medicines.

That last bit is where it gets interesting.

“In my particular case, there’s 50 different medications that are modified or I can’t take because of my DNA,” says Howard Jacob, Ph.D., vice president for genomic research at AbbVie, who sequenced his own genome. “In some cases I actually will metabolize [certain medications] faster, which means my body chews it up. So the dose I take is actually not the dose that my body sees.”

I want to be part of this journey for the patients who are not responding to existing medicines,” Kim says. “Solving that puzzle, it’s exciting

Sunhwa Kim, Ph.D.
associate scientific director, precision medicine
Maximizing our understanding and patient benefit

How our bodies respond to different treatments is the core question for scientists who work on precision medicine — and helps us understand more about a disease than just the symptoms.

“My son developed autoimmune disease when he was three months old,” says Sunhwa Kim, Ph.D., associate scientific director, precision medicine at AbbVie. “The pediatric specialist applied precision medicine for my son. I experienced the values and I want other parents to experience the maximized benefit from precision medicine. That’s why I’m doing this.”

For Jacob, knowing how his body interacts with certain medicines means his doctors can tailor his treatment for him — and pick a prescription that he won’t need to alter. But what does that mean for finding medical solutions for everyone else? Well, to understand how treatments will affect a huge group of people, you need a huge group of data. The tools to make that science possible exist at AbbVie today.

“One of the things I’m very excited about at AbbVie is we have a million genomes,” Jacob says. “That’s an amazing amount of data. We have the ability now to go in and start asking questions at a large scale.”

But science is still evolving. Scientists are hard at work collecting the biomarkers they need to understand how our bodies react to treatment — and, hopefully, creating a deeper understanding of how to find the right treatment faster.

“I want to be part of this journey for the patients who are not responding to existing medicines,” Kim says. “Solving that puzzle, it’s exciting.”


  1. National Human Genome Research Institute; National Human Genome Research Institute (NHGRI) Homepage; https://www.genome.gov/glossary/index.cfm?id=93;30/01/2019;N/A 
  2. National Institute of General Medical Sciences; National Institute of General Medical Sciences Homepage; https://www.nigms.nih.gov/; 05/10/2020


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