Table 6. Results of CD117 immunohistochemical product staining (mean ± SEM, Pvalue); the P-value refers to the significance of the difference between benign and malignant pigmented lesions for column benign; malignant and metastatic for column malignant; metastatic and benign for column metastatic. Such significance values are calculated with the usual t-test.

	Benign nevus	Primary malignant melanoma	Metastatic melanoma
Number of cases	39	18	3
Epidermal melanocytes	4.7±0.5, P=0.057	7.0±1.0, n.a.	n.a., n.a.
Dermal melanocytes	1.8±0.4, P=0.032	4.0±0.8, P<0.001	0±0, P<0.001

n.a., not available.