A clinical trial in the U.K. has just launched to assess the effectiveness of a newly developed breath test that could help diagnose multiple forms of cancer, including kidney cancer.

The rate of people dying from cancer in the United States seems to have dropped steadily for 25 years, a new study says, but disparities remain between the rich and the poor. The overall nationwide cancer death rate fell continuously from 1991 to 2016 by a total of 27%, according to a study by the American Cancer Society, published Tuesday in CA: A Cancer Journal for Clinicians.

Looking to enroll in a clinical trial? Check out this list from the National Cancer Institute.