Role of endoscopic ultrasound for pre-intervention evaluation in early esophageal cancer

Table 1 Basic demographics and clinical characteristics of all patients

Variable		Number/Total (n/N)	Percentage (%)
Gender	Males	42/49	85.7
Ethnicity	Caucasian	42/48	87.5
	Hispanic	1/48	2.1
	Asian	5/48	10.4
Type of cancer	Adenocarcinoma	44/49	89.8
	SCC	5/49	10.2
Degree of differentiation	Invasive well differentiated	18/39	46.2
	Invasive moderately differentiated	19/39	48.7
	Invasive poorly differentiated	4/39	10.3
History of Barrett’s esophagus	Yes	32/49	65.3
Esophageal ulceration	Yes	15/49	30.6
Tumor size	< 1 cm	6/48	12.5
	1 – < 1.5 cm	12/48	25
	≥ 1.5 - < 2 cm	11/48	22.9
	≥ 2 cm	19/48	39.6
Lymphadenopathy	Yes (only non-diagnostic EUS features)	24/48	50.0
EUS stage	T1a	24/49	48.9
	T1b	10/49	20.4
	T2	4/49	8.2
	T3	11/49	22.4
	T4	0/49	0
Specimen collection method	Biopsy	4/49	8.2
	EMR	25/49	51.0
	ESD	5/49	10.2
	Esophagectomy	15/49	30.6
Lympho-vascular invasion	Yes	12/49	24.4
Pathological staging	T1a	20/49	40.8
	T1b	13/49	26.5
	T2	5/49	10.2
	T3	11/49	22.4
Tumor recurrence	Yes	5/44	11.4

n: Number of patients with demographic or clinical characteristic present; N: Number of patients with clinical data available regarding the presence or absence of each demographic or clinical characteristic. EMR: Endoscopic mucosal resection; ESD: Submucosal dissection; EUS: Endoscopic ultrasound; SCC: Squamous cell carcinoma.