BRCA1 and MED12 were frequently mutated in triple negative breast cancer (TNBC) patients, PIK3CA and FAT1 mutations were frequent in HR+ patients, and PIK3CA and ERBB2 mutations were frequent in HER2+ patients.
Continued use of trastuzumab in PTEN-deficient HER2+ breast cancer induces the epithelial-to-mesenchymal transition (EMT), transforms HER2+ to triple negative breast cancer, and expands breast cancer stem cells (BCSCs).
Triple-negative breast cancer (TNBC; HER2-, ER-/PR-) is an aggressive subtype prone to drug resistance and metastasis, which is characterized by high intratumor microvascular density (iMVD) resulting from angiogenesis.
Using targeted sequencing, we detected somatic mutation-related discordant breast cancer including the VHL gene in the HR+/HER2- group (31% in concordant group, 0% in discordant group, p=0.03) and the IDH and RET genes (7% vs. 12%, p=0.02 and 0% vs. 25%, p=0.02, respectively) in the TNBC group.
HER4 was also found to be a favorable prognostic marker for overall survival (OS) among patients with non-TNBC in the subgroup analysis (Luminal: HR = 0.71, CI: 0.52-0.95, P = 0.023, fixed effects; HER2-positive: HR = 0.48, CI: 0.26-0.89, P = 0.020, fixed effects).
Here we used sequence analysis to detect HER2 (exon 18-23), p53 (exon 5-8) mutations; fluorescence in situ hybridization (FISH) method to analyse EGFR/chromosome 7 centromere gene status in 82 immunohistochemically TNBC.
We sought to elucidate the CEP17 and HER2 FISH patterns of interphase nuclei by evaluating Chr17 rearrangements in metaphases of 9 breast cancer cell lines and a primary culture from a triple negative breast carcinoma by using G-banding, FISH and M-FISH.
The aggressiveness of triple-negative breast cancer (TNBC), which lacks estrogen receptor, progesterone receptor and epidermal growth factor receptor 2 (HER2), represents a major challenge in breast cancer.
Very little is known about the genetic risk factors associated with triple-negative breast cancer (TNBC), an aggressive clinical subtype characterised by the absence of ER, PR and HER2. p53, the tumour suppressor gene, is essential for maintaining genomic stability in response to cellular stress.
Whole exome sequencing in triple negative breast cancer cases (n = 8) and targeted sequencing in healthy controls (n = 48) revealed BRIP1 rs552752779 (MAF: 75% vs. 6.25%, OR 45.00, 95% CI 9.43-243.32), ERBB2rs527779103 (MAF: 62.5% vs. 7.29%, OR 21.19, 95% CI 5.11-94.32), ERCC2 rs121913016 (MAF: 56.25% vs. 7.29%, OR 16.34, 95% CI 4.02-70.41), MSH6 rs2020912 (MAF: 56.25% vs. 1.04%, OR 122.13, 95% CI 12.29-2985.48) as risk factors for triple negative breast cancer.
Patients with luminal A/B breast cancer more often had residual nodal metastases (86%) at pathology, as compared to patients with HER2+ (20%) and Triple Negative breast cancer (50%), though not quite achieving statistical significance (p=0.055).
Triple-negative breast cancer (TNBC), which lacks estrogen receptor α (ERα), progesterone receptor, and human epidermal growth factor receptor 2 (HER2) expression, is closely related to basal-like breast cancer.
In particular, the triple-negative breast cancer (TNBC), characterized by a receptor negative pattern (ER/PgR/HER2-negative) and poor prognosis, can represent one of the most relevant clinical and public health priority in terms of observational research.
Interestingly, treatment with epigenetic modifiers resulted in (i) a pronounced increase in the expression of ERα and HER2/ERBB2 along with (ii) an increase in the sensitivity of TNBC cells to tamoxifen.