The cost of all but one of the 49 top-selling brand-name drugs included in a new JAMA study increased between 2012 and 2017.

By the numbers: The median cost increase of the drugs over these 6 years was 76%, and most drugs saw cost increases once or twice a year.

  • The results suggest that costs for popular branded drugs will double every 7 to 8 years.

Caveat: The study uses data from the Blue Cross Blue Shield Axis, which includes data from 35 million privately insured people. It did not account for rebates, which can't be linked to individual claims.

  • But it did compare its results with third-party estimates of net price data for each drug, and found that there was high correlation between net prices and costs.
  • "This association suggests that the offered supposition that higher list prices and greater reliance on rebates reduce costs may be untrue," the authors write.

Key quote: "Competition among brand-name competitors appeared to do little to stymie rising costs."

  • "Instead, products that may be prescribed interchangeably ... were highly synchronized in relative cost changes while demonstrating some of the largest cost increases in the industry over the past 6 years."

Go deeper: The drug pricing maze

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Ilhan Omar wins Minnesota primary

Photo: Stephen Maturen/Getty Images

Rep. Ilhan Omar (D-Minn.) won the Democratic primary against lawyer Antone Melton-Meaux on Tuesday evening, AP reports.

Why it matters: The race is one that's played out across the U.S. as progressives continue to sweep party nominations. Omar's win officially means all four progressive members of "The Squad" have won their primary elections.

Updated 3 hours ago - Politics & Policy

25 face felony charges after downtown Chicago hit by looters

Police officers inspect a damaged Best Buy in Chicago that was looted and vandalized. Photo: Scott Olson/Getty Images

Local police officers are seeking felony charges in 25 cases following the arrest of 100 people in the wake of widespread looting and property damage in Chicago on Monday, per the Washington Post.

Driving the news: Law enforcement said the event involving hundreds of people was a coordinated response after an officer shot a suspect Sunday evening, according to CBS Chicago.

Marjorie Taylor Greene wins Georgia's 14th district runoff

Photo: Elijah Nouvelage / Getty Images

Gun-rights activist Marjorie Taylor Greene defeated physician John Cowan in a runoff election for the Republican nomination in Georgia's deep-red 14th Congressional District on Tuesday, AP reports.

Why it matters: Greene, a vocal QAnon conspiracy theorist who has been condemned by GOP leaders for making multiple offensive remarks about Black people, Jews and Muslims in Facebook videos, is likely to win a seat in the House come November.