Table 3.
Results of 15N/14N and 13C/12C isotope ratio estimation.
| Delta Air | p Value * | Delta PDB | p Value ** | |||
|---|---|---|---|---|---|---|
| Tumour | 15N/14N Min | 8.10 | p < 0.01 | 13C/12C Min | −24.36 | p < 0.00001 |
| 15N/14N Max | 10.88 | p < 0.001 | 13C/12C Max | −19.99 | p = 0.0514515 | |
| 15N/14N Mean +/− SD | 8.93 ± 0.58 | p < 0.0001 | 13C/12C Mean +/− SD | −22.21 ± 0.89 | p < 0.0001 | |
| 15N/14N Median | 8.71 | p < 0.001 | 13C/12C Median | −22.33 | p < 0.001 | |
| Margin | 15N/14N Min | 8.19 | 13C/12C Min | −24.93 | p < 0.00001 | |
| 15N/14N Max | 11.38 | p < 0.001 | 13C/12C Max | −21.54 | p = 0.0514515 | |
| 15N/14N Mean +/− SD | 9.53 ± 0.64 | p < 0.0001 | 13C/12C Mean +/− SD | −23.36± 0.92 | p < 0.0001 | |
| 15N/14N Median | 9.49 | p < 0.001 | 13C/12C Median | −23.43 | p < 0.001 | |
| Healthy Tissue | 15N/14N Min | 8.35 | p < 0.01 | 13C/12C Min | −25.26 | p < 0.00001 |
| 15N/14N Max | 10.78 | p < 0.001 | 13C/12C Max | −21.07 | ||
| 15N/14N Mean +/− SD | 9.84 ± 0.61 | p < 0.0001 | 13C/12C Mean +/− SD | −23.68 ± 1.18 | p < 0.0001 | |
| 15N/14N Median | 9.86 | <0.001 | 13C/12C Median | −24.32 | p < 0.001 | |
* The maximum, mean and median values differed statistically between: (1) healthy tissue and tumour (2) margin and tumour. In addition, statistically significant differences in the minimum of delta Air were observed between: (1) healthy tissue and tumour (p < 0.01). ** The comparison of mean, standard deviation and median values of healthy tissue and tumour as well as margin samples and tumour tissues revealed a statistical significance. The correlations between maximum values of margin and tumour samples were also observed (p value = 0.0514515). In addition, statistically significant differences in the minimum of delta PDB in all tissues were observed.