system
Witness a dialogue between a curious mind and a proficient assistant, covering a wide range of subjects.
human
Can you make this medical article easier for patients to read?

'Tumor markers are substances that are produced by cancer cells or by normal cells in response to cancer in the body. They can be found in blood, urine, or body tissue. Tumor marker tests are used to help detect, diagnose, and manage cancer.'
gpt
Tumor markers are special things that can be found in your blood, urine, or body tissue when you have cancer. Doctors use them to check for, diagnose, and treat cancer.