2022
DOI: 10.1007/s10549-022-06637-w
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PIK3CA-mutations in breast cancer

Abstract: Purpose Phosphatidylinositide-3-kinase (PI3K) regulates proliferation and apoptosis; somatic PIK3CA-mutations may activate these processes. Aim of this study was to determine the prevalence of PIK3CA-mutations in a cohort of early stage breast cancer patients and the association to the course of disease. Patients and methods From an unselected cohort of 1270 breast cancer patients (PiA, Prognostic Assessment in routine application, NCT 01592825) 1123 tumou… Show more

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Cited by 51 publications
(29 citation statements)
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“…In summary, the data obtained with ZeptoChip detection and true single cell lysates were well in accordance with western blot analysis measured from more than 2x10 6 -fold starting cell material and support that the established workflow is highly sensitive and able to measure both the expression and functional (phosphorylation) status of signaling protein markers in parallel from single cells and in a multiplex format.…”
Section: Measuring Phosphorylation Of Akt In Single Tumor Cell Line C...supporting
confidence: 79%
See 1 more Smart Citation
“…In summary, the data obtained with ZeptoChip detection and true single cell lysates were well in accordance with western blot analysis measured from more than 2x10 6 -fold starting cell material and support that the established workflow is highly sensitive and able to measure both the expression and functional (phosphorylation) status of signaling protein markers in parallel from single cells and in a multiplex format.…”
Section: Measuring Phosphorylation Of Akt In Single Tumor Cell Line C...supporting
confidence: 79%
“…To this aim, CTCs are isolated and further characterizeddue to their stabilitymainly at the level of their genomic DNA to uncover DNA mutations and aberrations informing us about potential targeted treatment options (4). Some frequently detected -hence called -hotspot mutations are known for e.g., genes such as AKT1, PIK3CA, and ESR1, reaching frequencies between 2% to 40% in breast cancer (5)(6)(7). Such hotspot mutations, which mostly result in over-activated protein products drive the progression of tumor disease and the expansion of metastasizing tumor subclones.…”
Section: Introductionmentioning
confidence: 99%
“…In an attempt to decrease the metabolism and target the His931 residue, the C3-nitrile analogue 12 was synthesized and provided a compound that was 3-fold more potent and 4-fold more stable in human hepatocytes (Cl int for 12: 79 mL/min/kg) than 8. Conversely, replacing the C3-nitrile in 12 with a trifluoromethyl (13) or an amide ( 14) resulted in a substantial loss in potency.…”
Section: ■ Results and Discussionmentioning
confidence: 99%
“…However, in earlier stage of disease the detected GAs may give valuable hints concerning possible ineffectiveness or relevant toxicity of certain therapies. In this context, Reinhardt et al screened 1270 patients with early breast cancer for the presence of PIK3CA mutations and found a significant influence on the effect of adjuvant aromatase inhibitors but no influence on the efficacy of adjuvant tamoxifen [18]. Similar to ESCAT a validated classification of these GAs is highly needed for clinical routine.…”
Section: Discussionmentioning
confidence: 99%