Salivary Tryptophan as a Metabolic Marker of HER2-Negative Molecular Subtypes of Breast Cancer

Changes in the concentration of tryptophan (Trp) indicate a serious metabolic restructuring, which is both a cause and a consequence of many diseases. This work examines the upward change in salivary Trp concentrations among patients with breast cancer. This study involved volunteers divided into th...

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Bibliographic Details
Published in:Metabolites 2024-05, Vol.14 (5), p.247
Main Authors: Sarf, Elena A, Dyachenko, Elena I, Bel'skaya, Lyudmila V
Format: Article
Language:English
Subjects:
Amino acids
Biological markers
Biomarkers
Breast cancer
Cancer therapies
Capillary electrophoresis
Chemotherapy
Development and progression
Diagnosis
ErbB-2 protein
Estrogens
Health aspects
HER2
Malignancy
Mammography
Measurement
Metabolism
Metastases
Methods
Oncology
Physiological aspects
Progesterone
Progesterone receptors
Saliva
Salivary diagnostics
Statistical analysis
Tryptophan
Tumors
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Summary:Changes in the concentration of tryptophan (Trp) indicate a serious metabolic restructuring, which is both a cause and a consequence of many diseases. This work examines the upward change in salivary Trp concentrations among patients with breast cancer. This study involved volunteers divided into three groups: breast cancer (n = 104), non-malignant breast pathologies (n = 30) and healthy controls (n = 20). In all participants, before treatment, the quantitative content of Trp in saliva was determined by capillary electrophoresis. In 20 patients with breast cancer, Trp was re-tested four weeks after surgical removal of the tumor. An increase in the Trp content in saliva in breast cancer has been shown, which statistically significantly decreases after surgical removal of the tumor. A direct correlation was found between increased Trp levels with the degree of malignancy and aggressive molecular subtypes of breast cancer, namely triple negative and luminal B-like HER2-negative. These conclusions were based on an increase in Ki-67 and an increase in Trp in HER2-negative and progesterone-negative subtypes. Factors under which an increase in Trp concentration in saliva was observed were identified: advanced stage of breast cancer, the presence of regional metastasis, low tumor differentiation, a lack of expression of HER2, estrogen and progesterone receptors and the high proliferative activity of the tumor. Thus, the determination of salivary Trp may be a valuable tool in the study of metabolic changes associated with cancer, particularly breast cancer.
ISSN:2218-1989
2218-1989
DOI:10.3390/metabo14050247