Table 1. Clinicopathological features of patients studied for MDR1/P-gp and MRP-1 expression in melanoma primary and metastatic specimens.

Characteristics	Primary (%)	Metastatic (%)
Age (years)
<59	45.6 (42/92)	54.8 (23/42)
>59	54.3 (50/92)	45.2 (19/42)
Gender
Male	32.6 (30/92)	50.0 (21/42)
Female	67.4 (62/92)	50.0 (21/42)
Lymph node spread
Negative	92.4 (85/92)	28.6 (12/42)
Positive	7.6 (7/92)	71.4 (30/42)
Clark's level
I	1.08 (1/92)	97.6 (41/42)
II	10.9 (10/92)	0 (0/42)
III	32.3 (30/92)	0 (0/42)
IV	22.8 (21/92)	0 (0/42)
V	6.5 (6/92)	2.4 (1/42)
Unknown	26.1 (24/92)	0 (0/42)
Breslow thickness
<1 mm	31.5 (29/92)	2.4 (1/42)
1–2 mm	18.5 (17/92)	2.4 (1/42)
2.1–4 mm	10.9 (10/92)	0 (0/42)
>4 mm	21.7 (20/92)	4.8 (2/42)
Unknown	17.4 (16/92)	90.5 (38/42)
Relapse
Relapse ⩽5 years	25.0 (23/92)	19.0 (8/42)
Did not Relapse ⩽5 years	14.1 (13/92)	7.1 (3/42)
Unknown	60.9 (56/92)	73.8 (31/42)