scholarly journals Aromatase inhibitor strategies in metastatic breast cancer

2009 ◽  
pp. 67 ◽  
Author(s):  
Heather McArthur
Keyword(s):  
Breast Cancer ◽  
Metastatic Breast Cancer ◽  
Aromatase Inhibitor ◽  
Metastatic Breast

scholarly journals Efficacy of Exemestane After Nonsteroidal Aromatase inhibitor Use in Metastatic Breast Cancer Patients

2012 ◽  
Vol 13 (3) ◽  
pp. 979-983 ◽  
Author(s):  
Sun-Hye Kim ◽  
In-Hae Park ◽  
Hye-Won Lee ◽  
Keun-Seok Lee ◽  
Byung-Ho Nam ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Metastatic Breast Cancer ◽  
Aromatase Inhibitor ◽  
Cancer Patients ◽  
Metastatic Breast ◽  
Breast Cancer Patients

Real-world starting dose and outcomes of palbociclib plus an aromatase inhibitor for metastatic breast cancer.

2021 ◽  
Vol 39 (15_suppl) ◽  
pp. e13021-e13021
Author(s):  
Debra A. Patt ◽  
Xianchen Liu ◽  
Benjamin Li ◽  
Lynn McRoy ◽  
Rachel M. Layman ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Metastatic Breast Cancer ◽  
Aromatase Inhibitor ◽  
Real World ◽  
Metastatic Breast ◽  
Routine Practice ◽  
First Line ◽  
Starting Dose ◽  
The Us

e13021 Background: Palbociclib (PA) has been approved for HR+/HER2–advanced/metastatic breast cancer (mBC) in combination with an aromatase inhibitor (AI) or fulvestrant for more than 6 years. Regardless of the labeled recommended starting dose of 125mg/day, some patients initiate palbociclib at lower doses in routine practice. This study described real-world starting dose, patient characteristics, and effectiveness outcomes of first line PA+ AI for mBC in the US clinical setting. Methods: We conducted a retrospective analysis of Flatiron Health’s nationwide longitudinal electronic health records, which came from over 280 cancer clinics representing more than 2.2 million actively treated cancer patients in the US. Between February 2015 and September 2018, 813 HR+/HER2– mBC women initiated PA+AI as first-line therapy and had ≥ 3 months of potential follow-up. Patients were followed from start of PA+AI to December 2018, death, or last visit, whichever came first. Real-world progression-free survival (rwPFS) was defined as the time from the start of PA+AI to death or disease progression. Real-world tumor response (rwTR) was assessed based on the treating clinician’s assessment of radiologic evidence for change in burden of disease over the course of treatment. Multivariate analyses were performed to adjust for demographic and clinical characteristics. Results: Of 813 eligible patients, 68.3% were white, median age was 65.0 years, and 42.9% had visceral disease (lung and/or liver). Median duration of follow-up was 21.0 months. 805 patients had records of PA starting dose, with 125mg and 75/100mg/day being 86.5% and 13.5%, respectively. Patients who started at 75/100mg/day were more likely to be ≥75 years than those who started at 125mg/day (38.5% vs 17.1%). Other baseline and disease characteristics were generally evenly distributed. Patients who started at 125mg/day had longer median rwPFS (27.8 vs 18.6 months, adjusted HR=0.74, 95%CI=0.52-1.05) and higher rwTR (54.0% vs. 40.4%) than those patients who started 100/75mg/day (adjusted OR=1.76, 95%CI=1.13-2.74). Table presents results in detail. Conclusions: Most patients in this study initiated palbociclib at 125mg/day and dose adjustment was similar regardless of starting dose. These real-world findings may support initiation of palbociclib at a dose of 125mg/day in combination with AI for the first-line treatment of HR+/HER2- mBC. [Table: see text]

Neuroendocrine differentiation in metastatic breast cancer following CDK 4/6 inhibitors.

2021 ◽  
Vol 39 (15_suppl) ◽  
pp. e13029-e13029
Author(s):  
Sakina Sekkate ◽  
Laure Ladrat ◽  
Christelle Pouliquen ◽  
Celine Callens ◽  
Jean Francois Geay ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Metastatic Breast Cancer ◽  
Aromatase Inhibitor ◽  
Neuroendocrine Differentiation ◽  
Metastatic Breast ◽  
Standard Of Care ◽  
Proliferation Index ◽  
Castration Resistant Prostate Cancer ◽  
Metastatic Tumors ◽  
Ki 67

e13029 Background: First-line treatment with a CDK4/6 inhibitor in combination with an aromatase inhibitor for HR+/HER2- postmenopausal metastatic breast cancer (mBC) is considered as a standard of care based on the compelling data across all landmark trials. Methods: We report our experience about two cases with metastatic breast cancer treated by CDK4/6 inhibitor in combination with an aromatase inhibitor, which develop neuroendocrine differentiation. After observing an unusual massive progression, a biopsy of the metastasis was performed in both patients. Both histological analysis confirmed a lobular breast cancer with small cell neuroendocrine features and a high proliferation index (KI 67 90%). An NGS (Next generation sequencing) profile was realized on primary and metastatic tumors to detect new acquired genomic alterations. Results: The comparative analysis of the NGS results of primary and metastatic tumors revealed the occurrence of several events in both patients under treatment. For one patient, we identified new mutations in the genes CDH1, FANCG, PIK3CA, PTEN and TP53, which did not exist initially. For the second patient, we found an amplification of the segment containing FGFR1, CCND1, FGF4, FGF3, FADD genes and the deletion of the segment containing RB1 andTP53 genes. Such events were not observed on the primary tumor. Conclusions: Prostate adenocarcinoma may develop neuroendocrine features in later stages of castration-resistant prostate cancer but neuroendocrine differentiation is atypical in breast carcinoma. In case of unusual rapidly progressive disease after CDK4/6 inhibitor, biopsy of new metastases should be recommanded to search neuroendocrine differentiation, or druggable mutations to guide the treatment.

Sign in / Sign up

Export Citation Format

Share Document