Table 2.
Percentage content of nitrogen and carbon in tumour, margin and healthy tissues and total carbon-to-nitrogen ratio C/N and nitrogen-to-carbon ratio N/C.
| Percentage Content | Tumour | Margin | Healthy Tissue |
p Value | |
|---|---|---|---|---|---|
| Nitrogen | Min | 11% (0.112) | 9% (0.088) | 6% (0.063) | |
| Max | 13 % (0.13) | 12% (0.122) | 10% (0.095) | ||
| Mean ± SD | 12 ± 0.4% (0.124 ± 0.004) |
10 ± 0.8% (0.102 ± 0.008) |
8 ± 0.9% (0.083 ± 0.009) |
<0.00001 | |
| Median | 13% (0.125) | 10% (0.101) | 8% (0.084) | ||
| Carbon | Min | 44% (0.44) | 42% (0.42) | 53% (0.53) | |
| Max | 51% (0.51) | 57% (0.57) | 61% (0.61) | ||
| Mean ± SD | 46 ± 1.3% (0.46 ± 0.01) |
51 ± 3.1% (0.51 ± 0.03) |
57 ± 2.2% (0.57 ± 0.02) |
<0.00001 | |
| Median | 46% (0.46) |
51% (0.51) |
57% (0.57) |
||
| Total carbon-to-nitrogen ratio C/N | Min | 3.43 | 3.40 | 5.60 | |
| Max | 4.50 | 6.23 | 9.53 | ||
| Mean ± SD | 3.70 ± 0.24 | 5.07 ± 0.64 | 6.91 ± 1.12 | ||
| Median | 3.70 | 5.18 | 6.6 | ||
| Total nitrogen-to-carbon ratio N/C |
Min | 0.22 | 0.15 | 0.11 | |
| Max | 0.29 | 0.29 | 0.23 | ||
| Mean ± SD | 0.27 ± 0.02 | 0.20 ± 0.03 | 0.15 ± 0.03 | <0.00001 | |
| Median | 0.27 | 0.19 | 0.15 | ||