Table IV.

Mucosal melanoma by tumor thickness (Breslow depth) at diagnosis, race/ethnicity, California Cancer Registry, 1988 to 2013 (N = 137,332)

	Cutaneous	Mucosal
Depth	Total, N (%)	NonHispanic white, N (%)	NonHispanic black, N (%)	Hispanic, N (%)	Asian/Pacific Islander, N (%)	Total, N (%)
<1 mm	70,665 (60.5)	350 (38.9)	12 (46.2)	70 (38.5)	49 (39.5)	481 (39.0)
1-<2 mm	19,076 (16.3)	103 (11.4)	1 (3.9)	6 (3.3)	10 (8.1)	120 (9.7)
2-<4 mm	19,626 (16.8)	383 (42.5)	10 (38.5)	80 (44.0)	57 (46.0)	530 (43.0)
≥4 mm	7399 (6.3)	65 (7.2)	3 (11.5)	26 (14.3)	8 (6.5)	102 (8.3)
Total without unknowns	116,766	901	26	182	124	1233
Unknown	14,153 (10.8)	491 (35.3)	23 (46.9)	110 (37.7)	62 (33.3)	686 (55.6)
Total with unknowns	130,919 (100)	1392	49	292	186	1919 (100)