A measure of how deeply a melanoma tumour has
grown into the skin. The tumour thickness (depth) is usually measured from the
top of the tumour to the deepest tumour cells. If the tumour is ulcerated (the
skin is broken), it is measured from the base of the ulcer to the deepest
tumour cells. Breslow depth is used to help determine the stage of cancer.
Thicker tumours are linked with lower survival rates. Also called Breslow
thickness1.