In the United States, much of the effort to identify the estimated 300 million people who are living with viral hepatitis, but who have not been diagnosed, is now focused on diagnosing and treating hepatitis C (HCV), which the CDC has called “a silent epidemic.”
The statistics are sobering: about 3.5 million Americans are believed to be living with chronic HCV infection, and it is estimated that at least half of them don’t know that they are infected. The number of acute hep C cases reported to the CDC more than tripled between 2010 and 2016.
Hep C is the most common chronic blood-borne infection in the United States. It is ten times more infectious than HIV, and is the leading cause of liver disease and liver cancer. More deaths are attributed to hep C than from all 60 other reported infectious diseases combined.
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The CDC says that 320,000 deaths can be prevented by testing and referring infected persons to care and treatment. Experts agree that community pharmacists can make a major contribution to this effort.
While there is no vaccine for HCV, there is reason for optimism because there are more new medications available to treat the disease than ever before. These medications are dramatically changing treatment regimens and providing new hope for eradicating the disease, but this will happen only if patients are identified, diagnosed, and treated.
The Recent History of Hep C
Prior to 1989, hepatitis C was the virus with no name. In the preceding decade, large numbers of patients apparently suffering from a viral disease had been identified, but tested negative for both hepatitis A and B. The disease became known as non-A non-B hepatitis until it was sensibly renamed hepatitis C
In 1990, a test was developed to identify patients infected with HCV, but that created a new treatment challenge. Typically mild in its early stages, hep C is often not diagnosed until it is advanced, taking as long as 20 years to get to that point. Consequently, up to 85% of HCV infections become chronic, with increased risk of severe liver disease, including cirrhosis and liver cancer, and death. Hep C, in combination with hep B, now accounts for 75% of all cases of liver disease worldwide.
“Hepatitis C is predominantly spread by blood contact, so people who have used intravenous drugs or received a blood transfusion before 1991 when hepatitis C testing became available for the blood supply, are the main group of people who get hepatitis C,” says Coleman Smith, MD, a transplant hepatologist at Medstar Georgetown Transplant Institute and member of the National Medical Advisory Committee of the American Liver Foundation.
Up until quite recently, hepatitis C occurred most frequently in people born between 1945 and 1965—the so-called baby boomers. Today, however, the opioid epidemic is changing the epidemiology of the disease in the United States
“There’s now a second peak of hepatitis C occurring in much younger people, and that’s theoretically quite problematic,” Smith continues. While many older hep C patients have been or are being treated, many of the younger patients are not so fortunate. Additionally, Smith notes that there are still many people who don’t have access to medical care, are unaware of hepatitis C, continue to use drugs, or are incarcerated or homeless who are at increased risk.
The Hep C Treatment Landscape
Up to 25% of people infected with hep C clear the virus from their bodies without treatment. The remainder will develop an acute infection that, left untreated, becomes chronic. The game changer for treating them has been the introduction of direct-acting antivirals (DAAs) that have replaced the traditional regimens of the past.
“With the new medications that have clearance in the high 90th percentile, and the pangenotypic medications that are coming out, there’s more of a focus to treat these people so they don’t progress into decompensation and severe liver disease,” says Julie Akers, PharmD, a clinical assistant professor in the Department of Pharmacotherapy at Washington State University College of Pharmacy and Pharmaceutical Sciences. “The difficulty with that in the clinician’s world is that they didn’t already have that focus to be looking for the risk factors for hep C,” which meant that patients were not being routinely screened.
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DAA medications are less toxic and offer treatment regimens of eight to 12 weeks, depending on the patient’s degree of liver function or genotype. They target specific steps in the HCV life cycle to stop the virus from self-replicating. There are four major categories of DAA: NS3/4A protease inhibitors (PIs), nucleoside and nucleotide NS5B polymerase inhibitors, NS5A inhibitors, and non-nucleoside NS5B polymerase inhibitors
Smith says DAAs have made identifying people who need treatment even more critical. “If you have someone who has hepatitis C who has access to medical care and insurance, or the wherewithal to pay for these still-expensive drugs, you have a 95% to 99% chance of curing them—and when I say ‘cure’, I mean completely eradicating hepatitis C,” he declares.
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