Dr. Jonathan Chan

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Dr. Chan's Latest Work

PHOTO: Stock photo of a woman using a smartwatch before exercising. — Hocus-focus/STOCK PHOTO/Getty Images

Women reach heart health goals with less exercise than men, new study suggests

PHOTO: Chief Strategist to the President Steve Bannon speaks during the Semafor World Economy Summit 2025, April 23, 2025, in Washington, D.C. — Kayla Bartkowski/Getty Images

'Biggest Trump fan': How Bannon says he helped former Mafia hitman get early prison release

PHOTO: President Donald Trump responds to a question from the news media during a press conference in the Oval Office of the White House in Washington, October 15, 2025. — Jim Lo Scalzo/EPA/Shutterstock

Trump announces deal to reduce cost of specific IVF medication

PHOTO: Mammography — Picture Alliance/dpa/picture alliance via Getty I

New 1-day surgery removes cancer and reconstructs the breast in the same operation

PHOTO: A female patient at a doctor's office in an undated stock photo. — STOCK PHOTO/Adobe

A hard-to-spot breast cancer now makes up more than 1 in 10 cases in the US: Report

PHOTO: A patient is receivies a breast cancer screening in an undated stock photo. — STOCK PHOTO/Getty Images

40 years of breast cancer awareness has saved over half million lives and counting

PHOTO: Close up of a doctor using ultrasound scanner performing examination of breast for her patient. — STOCK PHOTO/Getty Images

Why dense breasts matter for breast cancer detection and prevention

PHOTO: Neurons in dementia, conceptual illustration — Science Photo Library via Getty Images

Preliminary but promising gene therapy shows 75% reduction in Huntington's disease progression

PHOTO: Members of the CDC's Advisory Committee on Immunization Practices are seen during a meeting of the CDC's Advisory Committee on Immunization Practices on September 18, 2025 in Chamblee, Georgia. — Elijah Nouvelage/Getty Images

CDC panel abandons COVID vaccine recommendation, saying it's a personal choice

PHOTO: In this Sept. 29, 2023, file photo, the Hepatitis B vaccine is shown in Atlanta. — Alyssa Pointer for The Washington Post via Getty Images, FILE

CDC advisers vote to restrict MMRV vaccine options for younger children, delay vote on hepatitis B vaccine

PHOTO: A Twinrix syringe for the prophylaxis against hepatitis A and hepatitis B virus from a pharmacy. — Sven Hoppe/picture alliance via Getty Images, FILE

Why doctors say the birth dose of the hepatitis B vaccine is still necessary

PHOTO: Acting director of the Center for Disease Control and Prevention, Jim O'Neill. — CDC

CDC's acting director tells staff to treat Americans 'as adults who can make their own informed decisions'

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