Table 1. The comparison of VOCs peak area in the headspace of cancer group (SHI-1cells), control group (human macrophage cells), and medium control (blank group).

Compounds	Mean peak area			F/χ2	P value
	Cancer group	Control group	Blank group
2,4-Dimethylheptane	1.9449 × 107 ± 5.0014 × 106	5.7271 × 106 ± 4.4027 × 106	0	20.613	0
Benzene	3.2566 × 107 ± 2.3706 × 106	6.3048 × 106 ± 2.3706 × 106	6.2363 × 106 ± 2.2509 × 106	15.680	0
4-Methyl decane	1.6823 × 106 ± 2.7623 × 105	0	0	21.807	0
Chloroform	5.0500 × 106 ± 2.9988 × 106	5.5885 × 105 ± 3.0981 × 105	0	21.256	0
3,7-Dimethyl dodecane	1.2917 × 106 ± 1.6308 × 105	2.7358 × 105 ± 4.5128 × 104	0	21.256	0
Hexanol	0	1.5162 × 106 ± 1.8187 × 105	2.0382 × 106 ± 4.0112 × 105	19.186	0
Cyclohexanol	0	2.9366 × 105 ± 4.3150 × 104	3.8009 × 106 ± 9.1831 × 105	21.256	0
Hexadecane	1.9195 × 106 ± 4.1809 × 105	1.3237 × 106 ± 3.1793 × 105	0	18.931	0

The results were expressed as the mean ± SD. One-way analysis of variance (ANOVA) or the Wilcoxon/Kruskal−Wallis to compare the normalized ionic peak area of gas emitted from three groups.