Glossary of Terms

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Term Definition
Germline testing

Genetic testing done using a blood or saliva sample. A common germline test is known as the FoundationOne Liquid CDX test.

Gleason Grade

A grade given to each of the two most prevalent patterns of cancer cells in tissue obtained from biopsy of a prostate tumor that is based on a scale of 1 to 5 with 1 to 3 corresponding to well-differentiated cancer cells similar in appearance to normal cells in surrounding tissue and 4 to 5 corresponding to poorly differentiated cancer cells that look abnormal.

Gleason Score

A score that is the sum of the two Gleason grades assigned to a prostate tumor and that is based on a scale of 2 to 10 with the lowest numbers indicating a slow-growing tumor unlikely to spread and the highest numbers indicating an aggressive tumor.