Fig. 1
![PCA score diagram in NEG mode and POS modeIn the figure, the ellipse represents the 95% confidence interval, and the abscissa PC [1] and ordinate PC [2] represent the score of the principal component ranking first and second, respectively. The scatter shapes and colours represent the different experimental groups](https://sciendo-parsed.s3.eu-central-1.amazonaws.com/64723278215d2f6c89dbf7bd/j_jvetres-2020-0070_fig_001.jpg?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&X-Amz-Credential=AKIA6AP2G7AKOUXAVR44%2F20251208%2Feu-central-1%2Fs3%2Faws4_request&X-Amz-Date=20251208T220230Z&X-Amz-Expires=3600&X-Amz-Signature=6c690daa565a35d433f8b307feaee8c1517a2d4e8758b0c8512f50cc90447840&X-Amz-SignedHeaders=host&x-amz-checksum-mode=ENABLED&x-id=GetObject)
Fig. 2
![OPLS-DA score in the NEG mode and POS modeIn the figure, the ellipse represents the 95% confidence interval, and the abscissa t[1]P represents the predicted principal component score of the first principal component. The ordinate t[1]O represents the orthogonal principal component score, and the scatter shapes and colours represent the different experimental groups](https://sciendo-parsed.s3.eu-central-1.amazonaws.com/64723278215d2f6c89dbf7bd/j_jvetres-2020-0070_fig_002.jpg?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&X-Amz-Credential=AKIA6AP2G7AKOUXAVR44%2F20251208%2Feu-central-1%2Fs3%2Faws4_request&X-Amz-Date=20251208T220230Z&X-Amz-Expires=3600&X-Amz-Signature=d43201d1c008673a416795d75e6e114ac38c41d0d6d389c1c9e1c3c929c5b041&X-Amz-SignedHeaders=host&x-amz-checksum-mode=ENABLED&x-id=GetObject)
Fig. 3

Fig. 4

Fig. 5

Fig. 6

Differential metabolites in feline mammary carcinomas based on LC-MS
| No. | Substance name | VIP | P | Variation trend | Detection mode |
|---|---|---|---|---|---|
| 1 | L-glutamate | 1.906599493 | 9.39957E−06 | ↑ | NEG |
| 2 | L-alanine | 1.870339069 | 9.66197E−05 | ↑ | NEG |
| 3 | Glycerol 3-phosphate | 1.813604415 | 0.001128205 | ↑ | NEG |
| 4 | Succinate | 1.790389164 | 0.000554729 | ↑ | NEG |
| 5 | 20-hydroxy-PGE2 | 1.786772601 | 2.17846E−05 | ↑ | NEG |
| 6 | Fosfomycin | 1.779219395 | 0.002655475 | ↑ | NEG |
| 7 | 3-methyluridine | 1.764311315 | 0.000277439 | ↑ | NEG |
| 8 | N-acetyl-L-alanine | 1.720196947 | 0.000240845 | ↑ | NEG |
| 9 | Choline | 1.877285980 | 2.37754E−07 | ↑ | POS |
| 10 | Trigonelline | 1.822938835 | 0.001548866 | ↑ | POS |
| 11 | Ile-asn | 1.806880095 | 1.10469E−05 | ↑ | POS |
| 12 | Arachidonic acid (peroxide free) | 1.772611472 | 0.001126785 | ↑ | POS |
| 13 | S-methyl-5′-thioadenosine | 1.770146402 | 0.000360333 | ↑ | POS |
| 14 | Creatinine | 1.751825211 | 5.23436E−05 | ↑ | POS |
| 15 | L-histidinol | 1.74002669 | 0.000841015 | ↑ | POS |
| 16 | Guanidine acetic acid | 1.698257167 | 0.000546455 | ↑ | POS |
| 17 | Cytosine | 1.662976359 | 0.000112223 | ↑ | POS |
| 18 | Inosine | 1.481481111 | 0.002446273 | ↓ | NEG |
| 19 | Adenine | 1.792517828 | 0.001575227 | ↑ | NEG |
| 20 | Hypoxanthine | 1.730804616 | 0.00067303 | ↑ | POS |
Experimental and control group animal basic information
| No. | Variety | Age (years) | Gender | Spaying status | Tumour type | Disease stage |
|---|---|---|---|---|---|---|
| T-1 | Chinese pastoral cat | 10 | Female | Unspayed | Mammary gland carcinoma | Without metastasis |
| T-2 | Chinese pastoral cat | 10 | Female | Unspayed | Mammary gland carcinoma | Without metastasis |
| T-3 | Chinese pastoral cat | 9 | Female | Unspayed | Mammary gland carcinoma | Without metastasis |
| T-4 | Chinese pastoral cat | 9 | Female | Unspayed | Mammary gland carcinoma | Without metastasis |
| T-5 | Chinese pastoral cat | 8 | Female | Unspayed | Mammary gland carcinoma | Without metastasis |
| T-6 | Chinese pastoral cat | 7 | Female | Unspayed | Mammary gland carcinoma | Without metastasis |
| C-1 | Chinese pastoral cat | 10 | Female | Unspayed | Healthy control | / |
| C-2 | Chinese pastoral cat | 9 | Female | Unspayed | Healthy control | / |
| C-3 | Chinese pastoral cat | 9 | Female | Unspayed | Healthy control | / |
| C-4 | Chinese pastoral cat | 8 | Female | Unspayed | Healthy control | / |
| C-5 | Chinese pastoral cat | 8 | Female | Unspayed | Healthy control | / |
| C-6 | Chinese pastoral cat | 8 | Female | Unspayed | Healthy control | / |
MRM target metabolomic validation
| Substance name | LC-MS non-target metabolomics results | MRM target metabolomics results | ||||
|---|---|---|---|---|---|---|
| Fold change | VIP | P | Variation trend (T C) | T group final concentration (average) | C group final concentration (average) | |
| S-methyl-5′-thioadesine | 2.879152807 | 1.770146402 | 0.000360333 | ↑ | 0.011 | 0.003 |
| Creatinine | 1.632513451 | 1.751825211 | 5.23436E−05 | ↑ | 42.117 | 10.13 |
| Cytosine | 1.981265029 | 1.662976359 | 0.000112223 | ↑ | 1.383 | 0.49 |
| Choline | 1.836734369 | 1.877285980 | 2.37754E−07 | ↑ | 4.381 | 0.71 |
| Betaine nicotinate | ||||||
| (Trigonelline) | 3.178675095 | 1.822938835 | 0.001548866 | ↑ | 1.915 | 0.32 |
| L-alanine | 1.891848591 | 1.870339069 | 9.66197E−05 | ↑ | 190.229 | 94.83 |
| L-glutamic acid | 5.129593730 | 1.533880516 | 0.019410600 | ↑ | 30.959 | 3.65 |