Main content area

Associations between functional polychlorinated biphenyls in adipose tissues and prognostic biomarkers of breast cancer patients

Qiu, Zhaolong, Xiao, Jiefeng, Zheng, Shukai, Huang, Wenlong, Du, Taifeng, Au, William W., Wu, Kusheng
Environmental research 2020 v.185 pp. 109441
adipose tissue, biomarkers, breast neoplasms, breasts, erbB-2 receptor, gas chromatography-mass spectrometry, lipids, medical records, metastasis, neurotoxicity, odds ratio, patients, polychlorinated biphenyls, questionnaires, regression analysis, resection, vascular endothelial growth factor C, China
Exposure to polychlorinated biphenyls (PCBs) has been shown to influence expression of some biomarkers that are predictive/prognostic for breast cancer. Therefore, our study was conducted to further investigating associations of different functional PCBs in adipose tissue with breast cancer prognostic biomarkers.Two hundred and five breast cancer patients were recruited in Shantou, China. Breast adipose tissues were collected during their resection surgery and levels of 7 PCB congeners were analyzed by gas chromatography-mass spectrometry (GC-MS). The PCB congeners were divided into 4 groups according to structure-activity. Socio-demographic, clinical and pathological information were obtained from questionnaire and digital medical records. Odds ratios (ORs) for associations between prognostic biomarkers and PCB levels (tertile 3 [T3], tertile 2 [T2] vs. tertile 1) were estimated from logistic regression models.Most PCB congeners were detectable, with a highest level (22.06 ng/g lipid) of PCB153. As for estrogenic PCBs, increased PCB52 exposure was positively associated with PR expression (ORT₂ = 2.36, Pₜᵣₑₙd = 0.054), but higher PCB101 level was negatively associated with HER-2 (ORT₃ = 0.24, Pₜᵣₑₙd = 0.029) and tumor size (OR = 0.43). Limited dioxin-like PCB138 exposure was positively associated with ER (ORT₂ = 3.23, ORT₃ = 3.77, Pₜᵣₑₙd = 0.047) but negatively with Top-IIα expression (ORT₂ = 0.35, ORT₃ = 0.28, Pₜᵣₑₙd = 0.080). Higher PCB153 (CYP inducer) level was negatively associated with ER (ORT₂ = 0.32, ORT₃ = 0.19, Pₜᵣₑₙd = 0.038) but positively with Ki-67 expression (ORT₂ = 1.43, ORT₃ = 3.60, Pₜᵣₑₙd = 0.055). Higher neurotoxic PCB28 was positively associated with HER-2 (ORT₃ = 5.43, Pₜᵣₑₙd = 0.006) and tumor size (OR = 2.37). Moreover, total PCBs exposure was positively associated with VEGF-C (ORT₂ = 76.91, ORT₃ = 97.96, Pₜᵣₑₙd = 0.041) and tumor metastasis (OR = 2.25).Different functional PCB congeners have different associations (both positive and negative) with breast cancer prognostic biomarkers, as well as tumor classification stage. Therefore, the development and aggressiveness of breast cancer may depend upon exposure to specific structure-activity of PCBs.