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Analytical methods

Comparative study #1 #2 #3
Chromatography GC GC GC
Ion source EI EI EI
Positive/Negative mode – – –
Mass analyzer ion trap ion trap ion trap
Identification level – – –

Sample information

Comparative study #1 #2 #3
Country Spain Spain Spain
Specimen serum urine bronchoalveolar lavage fluid
Marker function diagnosis diagnosis diagnosis
Participants(Case) Cancer type NSCLC, SCLC NSCLC, SCLC NSCLC, SCLC
Stage–––
Number323224
Gender (M,F)22, 822, 816, 8
Mean age (range) (M,F)66 ± 1266 ± 1265 ± 12
Smoking statusformer, current, non-smokerformer, current, non-smokerformer, current
Participants(Control) Type healthy healthy noncancerous lung diseases
Number292930
Gender (M,F)18, 1118, 1125, 5
Mean age (range) (M,F)56 ± 1356 ± 1355 ± 15
Smoking statusformer, non-smokerformer, non-smokerformer, current, non-smoker

Data processing and metabolite identification

Data processing software XCMS
Database search NIST Mass Spectral Library

Statistical analysis

Differential analysis method PLS-LDA, one-way ANOVA
Classification method ROC curve analysis
Survival analysis method –

Lung cancer-related metabolites identified in the paper

Metabolite Author-emphasized biomarkers Mean concentration (case) Mean concentration (control) Fold change (case/control) P-value FDR VIP
urea – – – 8.84 0.01 – 1.85
L-alanine – – – 8.60 0.03 – 1.19
succinic acid V – – 7.21 0.03 – 1.42
butanoic acid – – – 5.17 1.00e-02 – 1.52
uric acid V – – 4.25 0.04 – 1.99
deoxy-glucose V – – 4.24 0.05 – 2.31
glyceric acid – – – 4.12 0.01 – 1.79
L-threonine V – – 4.07 0.03 – 1.74
adipic acid V – – 3.96 0.02 – 2.21
purine – – – 3.72 0.00e+00 – 1.87
gluconic acid – – – 3.35 0.02 – 2.01
malonic acid V – – 3.31 5.00e-03 – 1.73
galactaric acid – – – 3.26 0.02 – 1.56
acetic acid – – – 3.17 0.04 – 1.72
ribonic acid – – – 2.91 0.04 – 2.00
stearic acid V – – 2.79 0.00e+00 – 2.10
ribitol V – – 2.76 3.00e-03 – 1.29
arabitol – – – 2.72 0.02 – 1.36
L-serine – – – 2.71 0.03 – 1.29
L-aspartate – – – 2.41 0.05 – 1.23
sorbitol – – – 2.37 3.00e-03 – 1.24
glucose V – – 2.29 1.00e-03 – 2.74
aconitic acid V – – 2.09 0.00e+00 – 1.51
threonic acid – – – 2.03 9.00e-03 – 1.93
L-cysteine – – – 1.90 0.04 – 1.28
palmitic acid – – – 1.85 0.03 – 1.53
glucuronic acid – – – 1.84 3.00e-03 – 1.28
acetic acid – – – 1.71 0.05 – 1.93
creatinine – – – 1.71 0.03 – 1.94
L-threonine – – – 1.54 9.00e-03 – 1.38
palmitic acid – – – 1.37 8.00e-03 – 2.11
stearic acid – – – 1.36 0.02 – 1.88
L-phenylalanine – – – 1.03 0.02 – 7.53
malonic acid V – – 1.02 2.00e-03 – 1.02
palmitic acid – – – 0.94 0.04 – 2.01
L-glycine V – – 0.91 0.02 – 1.33
L-cysteine – – – 0.91 9.00e-03 – 1.48
phosphoric acid V – – 0.82 5.00e-03 – 1.63
oleic acid – – – 0.78 0.02 – 1.45
isocitric acid – – – 0.77 0.01 – 2.27
L-ornithine – – – 0.70 0.02 – 8.97
fructose V – – 0.69 9.00e-03 – 2.24
L-proline – – – 0.68 0.04 – 1.01
L-serine – – – 0.67 0.01 – 1.12
arachidonic acid – – – 0.65 0.02 – 1.98
L-proline – – – 0.64 2.00e-03 – 1.39
galactose – – – 0.63 0.04 – 2.10
inositol – – – 0.63 0.03 – 1.17
lactic acid – – – 0.62 0.01 – 1.96
L-glutamine – – – 0.61 0.04 – 1.57
L-glycine – – – 0.60 0.02 – 1.49
uridine V – – 0.60 4.00e-03 – 5.82
glycerol V – – 0.59 4.00e-03 – 2.18
fructose – – – 0.58 0.02 – 1.66
inositol – – – 0.56 2.00e-03 – 1.66
tartaric acid – – – 0.54 1.00e-02 – 1.20
isocitric acid – – – 0.53 0.02 – 1.67
L-valine V – – 0.53 1.00e-03 – 1.50
L-asparagine V – – 0.52 0.00e+00 – 2.57
myristic acid – – – 0.50 0.04 – 2.42
L-glutamine – – – 0.50 0.03 – 1.44
L-aspartate – – – 0.48 0.05 – 1.35
hippuric acid – – – 0.47 0.04 – 2.37
phosphoric acid V – – 0.42 0.05 – 2.12
margaric acid V – – 0.42 0.01 – 2.24
stearic acid V – – 0.41 1.00e-03 – 11.38
isocitric acid V – – 0.40 0.03 – 1.44
phosphoric acid V – – 0.39 0.01 – 1.61
uric acid V – – 0.38 3.00e-03 – 2.64
inosine – – – 0.36 0.04 – 1.02
L-glycine V – – 0.29 5.00e-03 – 2.46
inositol V – – 0.17 5.00e-03 – 1.59
glucaric acid V – – 0.11 0.05 – 2.07
Metabolite Author-emphasized biomarkers Cutoff value AUROC (95%CI) Sensitivity (%) Specificity (%) Accuracy (%)
urea – – 0.7 – – –
L-alanine – – 0.59 – – –
succinic acid V – 0.81 – – –
butanoic acid – – 0.68 – – –
uric acid V – 0.75 – – –
deoxy-glucose V – 0.8 – – –
glyceric acid – – 0.74 – – –
L-threonine V – 0.82 – – –
adipic acid V – 0.75 – – –
purine – – 0.54 – – –
gluconic acid – – 0.74 – – –
malonic acid V – 0.79 – – –
galactaric acid – – 0.67 – – –
acetic acid – – 0.59 – – –
ribonic acid – – 0.66 – – –
stearic acid V – 0.88 – – –
ribitol V – 0.79 – – –
arabitol – – 0.63 – – –
L-serine – – 0.61 – – –
L-aspartate – – 0.73 – – –
sorbitol – – 0.67 – – –
glucose V – 0.82 – – –
aconitic acid V – 0.81 – – –
threonic acid – – 0.7 – – –
L-cysteine – – 0.64 – – –
palmitic acid – – 0.7 – – –
glucuronic acid – – 0.73 – – –
acetic acid – – 0.52 – – –
creatinine – – 0.67 – – –
L-threonine – – 0.69 – – –
palmitic acid – – 0.69 – – –
stearic acid – – 0.64 – – –
L-phenylalanine – – 0.73 – – –
malonic acid V – 0.75 – – –
palmitic acid – – 0.53 – – –
L-glycine V – 0.76 – – –
L-cysteine – – 0.54 – – –
phosphoric acid V – 0.77 – – –
oleic acid – – 0.54 – – –
isocitric acid – – 0.61 – – –
L-ornithine – – 0.65 – – –
fructose V – 0.75 – – –
L-proline – – 0.63 – – –
L-serine – – 0.67 – – –
arachidonic acid – – 0.67 – – –
L-proline – – 0.71 – – –
galactose – – 0.68 – – –
inositol – – 0.58 – – –
lactic acid – – 0.65 – – –
L-glutamine – – 0.67 – – –
L-glycine – – 0.74 – – –
uridine V – 0.76 – – –
glycerol V – 0.88 – – –
fructose – – 0.6 – – –
inositol – – 0.74 – – –
tartaric acid – – 0.72 – – –
isocitric acid – – 0.57 – – –
L-valine V – 0.75 – – –
L-asparagine V – 0.83 – – –
myristic acid – – 0.73 – – –
L-glutamine – – 0.66 – – –
L-aspartate – – 0.74 – – –
hippuric acid – – 0.69 – – –
phosphoric acid V – 0.79 – – –
margaric acid V – 0.78 – – –
stearic acid V – 0.8 – – –
isocitric acid V – 0.75 – – –
phosphoric acid V – 0.75 – – –
uric acid V – 0.79 – – –
inosine – – 0.63 – – –
L-glycine V – 0.82 – – –
inositol V – 0.76 – – –
glucaric acid V – 0.93 – – –

Paper graphical summary