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A one-month pack of hormonal birth control pills. Photo: Rich Pedroncelli / AP

Women who use hormonal birth control — pills or devices that release hormones — are at a slightly higher risk for breast cancer, per a new study published in the New England Journal of Medicine.

Why it matters: It "upends widely held assumptions about modern contraceptives for younger generations of women," who think hormonal contraceptives are safer than old methods that contained higher amounts of estrogen, the New York Times reports.

The numbers: Scientists studied 1.8 million Danish women for over a decade and found those who used hormonal contraceptives had about a 20% increased risk of developing breast cancer. Among women who used hormonal birth control for more than 10 years, the risk rose to 38%. The study estimates 55 cases of breast cancer among every 100,000 women who do not use hormonal contraceptives and 68 cases among every 100,000 who do.

The bottom line: The study showed a relatively small increased risk for cancer among women who used these forms of contraceptives. Still, “there was a hope that the contemporary preparations would be associated with lower risk ... This is the first study with substantial data to show that’s not the case," David J. Hunter, a professor of epidemiology and medicine at the University of Oxford, told the NYT.

Go deeper

1 hour ago - World

Mapped: The world's most and least corrupt countries

Expand chart
Data: Transparency International; Map: Jared Whalen/Axios

The most corrupt governments in the world are in South Sudan, Syria and Somalia, according to Transparency International's annual index, while the "cleanest" are in Denmark, Finland and New Zealand.

  • Breaking it down: The U.S. is 27th, China 66th, India 85th, Brazil 96th and Russia 136th. Scroll over the map to see each country's ranking.

Crypto leads to massive surge in online scams

Expand chart
Reproduced from FTC; Chart: Axios Visuals

Bogus cryptocurrency investments led to an unprecedented increase in online scams last year, according to new data from the Federal Trade Commission (FTC).

Why it matters: Cryptocurrency is an easy target because while it's surging in popularity, there's still a lot of confusion about how it works.

Tina Reed, author of Vitals
3 hours ago - Health

New clues emerge on long COVID

Illustration: Maura Losch/Axios

The presence of certain autoantibodies or high amounts of coronavirus RNA in the blood could be indicators a patient has a higher chance of developing long COVID, according to a new study in the journal Cell.

  • Other factors include a person having Type 2 diabetes or the reactivation of the Epstein-Barr virus.