Clinical relevance of fluorodeoxyglucose positron emission tomography/computed tomography and magnifying endoscopy with narrow band imaging in decision-making regarding the treatment strategy for esophageal squamous cell carcinoma

Table 5 Diagnostic performance for invasion depth of SM2-3 or lesions indicated for surgery or chemoradiotherapy by fluorodeoxyglucose positron emission tomography alone

	Invasion depth of SM2-3	Lesions indicated for surgery or CRT	P value
Sensitivity	93.3% (14/15)	78.3% (18/23)	0.37
Specificity	77.6% (52/67)	81.4% (48/59)	0.60
PPV	48.2% (14/29)	62.1% (18/29)	0.29
NPV	98.1% (52/53)	90.6% (48/53)	0.12
Accuracy	80.5% (66/82)	80.5% (66/82)	1.00

SM2: Middle third of the submucosal layer; SM3: Lower third of the submucosal layer; CRT: Chemoradiotherapy; PPV: Positive predictive value; NPV: Negative predictive value.