Spending on prescription drugs that are covered under the medical benefit increased by 65% between 2014 and 2018 for commercial insurers and 40% for Medicare, according to Magellan Rx Management's annual Medical Pharmacy Trend Report.
"The increase in medical pharmacy spend seems to largely be driven by inflation," Kristen Reimers, Magellan's senior vice president of specialty clinical solutions, tells AIS Health. "This can be a combination of two things, increasing costs of existing drugs and providers utilizing newer more expensive drugs. The pipeline was extremely robust and new therapies to market are contributing to inflation, driving the trend."
Like other biologic drugs, most biologic oncology drugs have yet to see significant biosimilar competition due to barriers in the biosimilar market and development pipeline.
"The most exciting biosimilars are those currently in the oncology space. Herceptin, Avastin and Rituxan have been the top five drugs in terms of spend for the last 10 years," says Reimers. "Rituxan and Avastin now have two biosimilars on the market, and Herceptin has five marketed products. There will be competition, which will help to flatten the trend for these products, although there is still expected to be growth."
Emerging competition could bolster the already-improving price outlook for more established biologic drugs. However, growth in oncology spending is not likely to stop any time soon. In some ways, this is good news for patients: according to Reimers and the Magellan report, promising new, targeted therapies for hard-to-treat cancers will account for much of the increased spending in coming years.
"The pipeline for oncology is extremely robust, with over 700 drugs being studied for a variety of different cancer types," Reimers says.