<unk> , also called the Jewett staging system or the Whitmore-Jewett staging system, is a staging system for prostate cancer that uses the letters A, B, C, and D.
“A” and “B” refer to cancer that is confined to the prostate.
“C” refers to cancer that has grown out of the prostate but has not spread to lymph nodes or other places in the body.
“D” refers to cancer that has spread to lymph nodes or to other places in the body.<unk>  can also refer to a test for the warning signs of melanoma, usually found in moles.
"A" Asymmetry
"B" Border Irregularity
"C" Color. If the patch is multi-colored, it may be melanoma.
"D" Diameter. If the patch is wider than 6 millimeters, it may be melanoma.
ABCD rating
Apgar score
Octane rating
Kick chart
SOFA score
Pressure volume diagram
Electromagnetic spectrum
Boil classification