A Harvard Medical School study shows the sex hormone estrogen — thus far thought to be only a fuel for breast cancer growth — can directly cause tumor-driving genomic rearrangements.

Guidance shifts amid troubling breast cancer trends in young and Black women.

Emerging research suggests following surgery with medication may produce similar results for patients as young as 55.

Newly developed polygenic risk scores, which add up hundreds or thousands of genetic risk factors for six common diseases, can aid physicians and patients in making individualized disease screening and prevention decisions.

New target for old antibiotic rooted in decades-long effort to unlock secrets of lethal childhood disease.

Harvard Chan’s David Williams, whose research looks at how discrimination affects Black people’s health, talks about his pioneering work to assess the toll that police killings are having on Black mental health.