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 4 Diagnostic performance of invasion depth using narrow band imaging magnification before treatment for superficial esophageal carcinoma

	Type B1 for EP-LPM	Type B2 for MM-SM1	Type B3 for SM2-3
Sensitivity	87.5% (42/48)	68.4% (13/19)	46.7% (7/15)
Specificity	79.4% (27/34)	79.4% (50/63)	100% (67/67)
PPV	85.7% (42/49)	50.0% (13/26)	100% (7/7)
NPV	81.8% (27/33)	89.3% (50/56)	89.3% (67/75)
Accuracy	84.1% (69/82)	76.8% (63/82)	90.2% (74/82)

EP: Mucosal epithelium; LPM: Lamina propria mucosae; MM: Muscularis mucosae; SM1: Upper third of the submucosal layer; SM2: Middle third of the submucosal layer; SM3: Lower third of the submucosal layer; PPV: Positive predictive value; NPV: Negative predictive value.