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Table 1 Characteristics of the included prediction model studies

From: Inconsistencies in predictive models based on exhaled volatile organic compounds for distinguishing between benign pulmonary nodules and lung cancer: a systematic review

Study

Year

Country

Study design

Sample size

Study participants

BPN

[n (%)]

Patient characteristic information

Setting

Patients characteristics

Diagnostic methods

Peled, N. [20]

2012

America

prospective trial

72

53 patients with MPN, 19 with BPN

19(26.39)

the University of Colorado Cancer Center and Denver Veterans Affairs Medical Center

47 NSCLC (30 adenocarcinomas, 13 squamous cell carcinoma, 2 large cell carcinoma, and 2 poorly differentiated carcinoma), 6 SCLC

Histologic diagnosis or serial CT

Bousamra, M., 2nd [21]

2014

America

cross-sectional

147

107 patients with LC, 40 patients with BPNs

40(27.21)

NR

97 NSCLC, 8 SCLC, 1 combined SCLC and NSCLC, 1 carcinoid

Bronchoscopy, CT-guided biopsy, or surgical biopsy/serial CT scans

Fu, X. A. [22]

2014

America

cross-sectional

129

97 patients with MPN, 32 patients with BPN

32(24.80)

NR

88 NSCLC (33 adenocarcinoma, 32 squamous cell carcinoma), 9 SCLC

Biopsy or resection

Li, M. X. [61]

2015

America

cross-sectional

119

85 patients with MPN, 34 patients with BPN

34(28.57)

the James Graham Brown Cancer Center at the University of Louisville

78 NSCLC (31 adenocarcinoma, 33 squamous cell,14 Others), 7 SCLC;2 pneumonia, 8 granuloma, 3 inflammation, 2 histoplasmosis, 2 epithelial cells, 1 foamy macrophages, 16 unknown

CT, pathological diagnoses

Schumer, E. M. [23]

2015

America

cross-sectional

221

156 patients with LC, 65 patients with BPNs

65(29.41)

NR

103 stage 0-II, 53 stage III-IV

Pathologic/tissue diagnosis or repeated CT

Phillips, M. [27]

2019

America

cross-sectional

80

65 patients with MPN, 15 patients with BPN

15(18.75)

NR

NR

LDCT, Biopsy

Shaohua Xie [49]

2020

China

cross-sectional

147

104 with MPN, 43 patients with BPN

43(29.25)

Sichuan Cancer Hospital

NR

CT, Pathologic diagnosis

Pengqiang Liao [28]

2021

China

cross-sectional

768

629 patients with LC, 139 patients with BPN

139(18.10)

Sichuan Cancer Hospital; Nanchong Central Hospital; Longquanyi CDC

NR

Surgery or biopsy

Chen, X. [24]

2021

China

cross-sectional

230

160 patients with MPN, 70 patients with BPN

70(30.43)

Sir Run Run Shaw Hospital

149 NSCLC (117 adenocarcinomas,32 squamous cell carcinoma), 10 SCLC

CT, X-ray, pathological diagnoses

Rai, S. N. [58]

2022

America

cross-sectional

221

156 patients with LC, 65 patients with benign PNs

65(29.41)

healthy control: from patient family members

the James Graham Brown Cancer Center and Jewish Hospital at the University of Louisville

103 stage 0-II, 53 stage III-IV

CT, PET scans; biopsy or surgically resected specimens

Ding, X. [60]

2023

China

cohort study

PKUPH Cohort: 100

CHPKU Cohort: 63

PKUPH Cohort: 49 lung cancer patients and 51 benign pulmonary nodules

CHPKU Cohort: 39 lung cancer and 24 benign nodules

PKUPH Cohort: 51(51.00)

CHPKU Cohort: 24(38.10)

PKUPH Cohort: the Department of Thoracic Surgery, Peking University People’s Hospital;

CHPKU Cohort: the Cancer Hospital of Peking University

PKUPH Cohort:

stage I; 49 adenocarcinom

CHPKU Cohort:

stage I-III; 19 adenocarcinom, 2 quamous cell carcinoma, 2 small cell lung cancer

CT, pathological diagnoses

  1. NR: Not report; MPN: Malignant pulmonary nodules; BPN: Benign pulmonary nodules; LC: Lung cancer; NSCLC: Non-small cell lung cancer; SCLC: Small cell lung cancer; CT: Computerized tomography; PET: positron emission tomography; PKUPH Cohort: Peking University People’s Hospital as the discovery cohort; CHPKU Cohort: the Cancer Hospital of Peking University