Table 1. Clinical data of follow-up patients diagnosed with EAML (n = 43).

Baseline data
Gender	male/female=25/18
Mean age/years	38.4 (24–76)
Max diameter	≤4cm: n=29; 4–7 cm: n=4; 7–10 cm: n=7; ≥10 cm: n=3
percentage of epithelioid cells	>90%: n=6; 70–90%: n=9; 5%~70%: n=28. mean: 43.8±22.2
percentage of atypia cells	>90%: n=2; 70–90%: n=5 ; 5%~70%: n=36. mean: 28.4±23.1
Degree of atypia	severe: n=4; moderate: n=10; low: n=29
Necrosis	prominent: 21; focal: 16; little: 6
Associated symptoms/signs	backaches: n=6; hematuria: n=2; without: n=35
Involvement range
confined to kidney(n=35)	Right: n=19 left: n=16
beyond kidney (n=6)	perinephric fat: n=3; renal vein: n=2; infraphrenic postcava: n=1
distant metastasis(n=2)	liver: n=1; bowel: n=1
tumor embolus	(+) for 3 cases (1 in infraphrenic postcava; 2 in renal vein)
Lymph nodes metastasis	renal hilus node: n=1; renal hilus and para-aortic nodes: n=1
Distant metastasis	liver: n=1; bowel: n=1
Surgical method	radical nephrectomy: n=12; nephron-sparing surgery: n=30;radical nephrectomy + removal of tumor thrombus in postcava: n=1
IHC stain
HMB-45$	39 (+); 4(focal +)
Ki-67&	10 (+, 2–10%); 28 (−); 5 (unclear)
S100⊠	40 (−); 3 (unclear)
Follow-up data
Follow up duration/month	44.3 (4−71)
survival status	alive : n=41; dead: n=2
Recurrence	One patient with renal hilus node metastasis at baseline suffered local recurrence 10 months postoperatively and died from serious cancer cachexia 4 months later
Metastasis	One patient suffered metastasis to the liver and lung 12 mons postoperatively and died 17 months after metastasis

^$HMB-45 is a monoclonal antibody that reacts against an antigen present in melanocytic tumors such as melanomas, and means Human Melanoma Black.

^&KI-67 is a nuclear protein that is associated with and may be necessary for cellular proliferation.

^⊠S100 is a kind of melanoma marker.