Scientists Perform First Pig-to-Human Lung Transplant

Researchers in China placed a lung from a genetically modified pig into a brain-dead man, with mixed results.

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Are Marathons and Other Extreme Running Linked to Colon Cancer?

A small, preliminary study found that marathoners were much more likely to have precancerous growths. Experts aren’t sure why.

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New Implant Offers Hope for Easing Rheumatoid Arthritis

The device stimulates the vagus nerve, signaling the body to tamp down the inflammation that contributes to the disease.

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F.D.A. Panel to Reassess Hormone Therapy Warnings

Dr. Marty Makary, the agency’s commissioner, has said too many women avoid menopause treatments because the risks have been overstated.

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Trump Travel Restrictions Bar Residents Needed at U.S. Hospitals

Limits on travel and visa appointments have delayed or prevented foreign doctors from entering the country for jobs set to begin in weeks.

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Trump Budget’s Caps on Grad School Loans Could Worsen Doctor Shortage

The proposed limits on federal loans fall well below the costs of medical school. Critics say this could deter students from pursuing medicine.

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Gun Deaths of Children Rose in States That Loosened Gun Laws, Study Finds

Researchers looked at firearm fatalities in the 13 years immediately after the Supreme Court limited local governments’ ability to restrict gun ownership.

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One Type of Mammogram Proves Better for Women With Dense Breasts

Contrast-enhanced mammography identified three times as many tumors as ultrasound scans. But it is not widely used for screening in the United States.

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Is There Really a Chronic Disease Epidemic? It’s Complicated.

Robert F. Kennedy Jr. wants to return the nation to a time when he believes Americans were healthier. Not so fast, many researchers say.

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New N.I.H. Policy Threatens Global Science Collaborations

Restrictions on payments to foreign partners may jeopardize studies of cancer and other conditions that would benefit Americans.

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