## 3 Experimental Results
Figure 3: Chromatographic profile (SCAN mode) of the exhaled breath of patient (n\({}^{\circ}\) 2) affected by an adenomatous colonic polypoid lesion before endoscopic treatment. \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Compounds** & **Equation** & **R2** & \
\begin{tabular}{c} **Normal Mucosa** \\ **Range (mg/mL)** \\ \end{tabular} &
\begin{tabular}{c} **Adenomatous Polypoid Lesion** \\ **Range (mg/mL)** \\ \end{tabular} \\ \hline Benzaldehyde & Y = 1912X + 456 & 0.9995 & nd-1.43 \(\pm\) 0.62 & nd-1.60 \(\pm\) 0.70 \\ \hline Ethlybenzene & Y = 2358X + 2998 & 0.9988 & nd-1.52 \(\pm\) 0.23 & nd-0.96 \(\pm\) 0.12 \\ \hline Indole & Y = 807X + 408 & 0.9995 & nd-7.03 \(\pm\) 1.05 & nd-13.58 \(\pm\) 1.12 \\ \hline Methylbenzene & Y = 17,243X + 1807 & 0.9990 & nd-1.29 \(\pm\) 0.16 & nd-4.95 \(\pm\) 0.11 \\ \hline Phenol & Y = 861X + 734 & 0.9902 & nd-3.45 \(\pm\) 0.05 & nd-3.11 \(\pm\) 0.04 \\ \hline Octanal & Y = 2090X + 597 & 0.9998 & nd-0.78 \(\pm\) 0.30 & nd-0.27 \(\pm\) 0.13 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Linear regression analysis and concentration ranges of VOCs in culture media with colon tissues (normal mucosa and adenomatous polypoid lesion) from seven selected patients. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \# & **RT (min) a** & **Common Compound Name** & **Match (\%)** & **Probability (\%)** & **Standard Identity** \\ \hline
1 & 5.71 \(\pm\) 0.05 & Carbon dioxide & 891 & 90 & \\ \hline
2 & 6.04 \(\pm\) 0.02 & Unidentified & & & \\ \hline
3 & 6.45 \(\pm\) 0.06 & 2,4-Dimethyl pentane & 930 & 91 & \\ \hline
4 & 6.52 \(\pm\) 0.07 & Hexene & 879 & 89 & \\ \hline
5 & 6.66 \(\pm\) 0.08 & Sulfur dioxide & 878 & 87 & \\ \hline
6 & 6.78 \(\pm\) 0.09 & Difluoro methyl-silane & 801 & 52 & \\ \hline
7 & 6.82 \(\pm\) 0.06 & Trimethyl silyland & 773 & 55 & \\ \hline
8 & 6.93 \(\pm\) 0.06 & Ethane, 1,2-diethoxy & 801 & 61 & \\ \hline
9 & 7.01 \(\pm\) 0.03 & 1-Pentene-4-methyl & 822 & 54 & \\ \hline
10 & 7.20 \(\pm\) 0.09 & 2-Propane & 833 & 60 & yes \\ \hline
11 & 7.61 \(\pm\) 0.08 & 1,1,1,1-Trifluoro trimethyl-silylanol & 828 & 56 & \\ \hline
12 & 7.94 \(\pm\) 0.05 & Cyclobutanol & 903 & 78 & \\ \hline
13 & 8.37 \(\pm\) 0.05 & Trichloro-monofluuro-methane & 822 & 57 & \\ \hline
14 & 8.95 \(\pm\) 0.06 & 1,3-Pentadiene & 954 & 75 & \\ \hline
15 & 9.12 \(\pm\) 0.06 & 2-Propanol-1-methoxy & 930 & 80 & \\ \hline
16 & 9.77 \(\pm\) 0.02 & Unidentified & & & \\ \hline
17 & 10.11 \(\pm\) 0.04 & 2-Pentene & 915 & 85 & \\ \hline
18 & 10.24 \(\pm\) 0.05 & 2-Butanol-3-methyl & 907 & 84 & \\ \hline
19 & 10.31 \(\pm\) 0.06 & 2-Methyl pentanal & 839 & 58 & \\ \hline
20 & 10.54 \(\pm\) 0.05 & Cyclopentane & 903 & 88 & \\ \hline
21 & 10.83 \(\pm\) 0.05 & 2,3-Dimethyl pentane & & 66 & \\ \hline
22 & 10.91 \(\pm\) 0.03 & Hexane & 913 & 92 & yes \\ \hline
23 & 11.00 \(\pm\) 0.03 & 4-Methyl-2-pentyne & 877 & & \\ \hline
24 & 11.44 \(\pm\) 0.06 & Acetonitrile & 920 & 90 & yes \\ \hline
25 & 11.52 \(\pm\) 0.02 & Unidentified & & & \\ \hline
26 & 11.63 \(\pm\) 0.08 & Benzene & 938 & 89 & yes \\ \hline
27 & 12.42 \(\pm\) 0.05 & Unidentified & & & \\ \hline
28 & 12.91 \(\pm\) 0.05 & 1,3,5-Trifluoro benzene & 852 & 57 & \\ \hline
29 & 13.27 \(\pm\) 0.03 & Dichloromethane & 931 & 93 & yes \\ \hline
30 & 13.55 \(\pm\) 0.06 & Hexamethyl disiloxane & 828 & 81 & \\ \hline
31 & 13.82 \(\pm\) 0.04 & 2-Butanone & 948 & 96 & yes \\ \hline
32 & 14.13 \(\pm\) 0.07 & Heptene & 899 & 88 & yes \\ \hline
33 & 14.33 \(\pm\) 0.02 & 3-Hexanol & 866 & 77 & \\ \hline
34 & 14.96 \(\pm\) 0.04 & Acetic acid & 915 & 67 & \\ \hline
35 & 15.90 \(\pm\) 0.05 & 2-Propanol-1-methoxy & 838 & 52 & \\ \hline
36 & 16.49 \(\pm\) 0.03 & 1,4-Dioxane & 828 & 51 & \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Lists of compounds, RT, characteristic ions (\(m/z\)), match factor, probability, and standard identity confirmation detected (\(\mathrm{S/N}\geq 3\)) in the breath of the seven patients with adenomatous colonic polypoid lesion, before endoscopic treatment.