scholarly journals Phosphorylation of estrogen receptor α serine 167 is predictive of response to endocrine therapy and increases postrelapse survival in metastatic breast cancer

2005 ◽  
Vol 7 (5) ◽  
Author(s):  
Hiroko Yamashita ◽  
Mariko Nishio ◽  
Shunzo Kobayashi ◽  
Yoshiaki Ando ◽  
Hiroshi Sugiura ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Estrogen Receptor ◽  
Metastatic Breast Cancer ◽  
Endocrine Therapy ◽  
Metastatic Breast ◽  
Estrogen Receptor Α

Fulvestrant ('Faslodex')--a new treatment option for patients progressing on prior endocrine therapy.

2002 ◽  
pp. 267-276 ◽  
Author(s):  
C Morris ◽  
A Wakeling
Keyword(s):  
Breast Cancer ◽  
Estrogen Receptor ◽  
Metastatic Breast Cancer ◽  
Advanced Breast Cancer ◽  
Postmenopausal Women ◽  
Endocrine Therapy ◽  
Metastatic Breast ◽  
Advanced Breast ◽  
Phase Iii ◽  
Hormone Receptor Positive

Since its introduction more than 30 years ago, tamoxifen has been the most widely used endocrine therapy for the treatment of women with advanced breast cancer. More recently, a number of alternative endocrine treatments have been developed, including several selective estrogen receptor modulators (SERMs), aromatase inhibitors (AIs) and, most recently, fulvestrant ('Faslodex'). Fulvestrant is an estrogen receptor (ER) antagonist, which, unlike the SERMs, has no known agonist (estrogenic) effect and downregulates the ER protein. Tamoxifen is effective and well tolerated, although the non-steroidal AIs, anastrozole and letrozole, are more effective treatments for advanced disease than tamoxifen. Fulvestrant has recently gained US Food and Drug Administration approval for the treatment of hormone receptor-positive metastatic breast cancer in postmenopausal women with disease progression following antiestrogen therapy. In two global phase III clinical trials fulvestrant was at least as effective and as equally well tolerated as anastrozole for the treatment of postmenopausal women with advanced and metastatic breast cancer. In a retrospective analysis of the combined data from these trials, mean duration of response was significantly greater for fulvestrant compared with anastrozole. These new hormonal treatments expand the choice of endocrine therapy for women with advanced breast cancer and offer new options for sequencing and combining treatments.

Fulvestrant in advanced breast cancer following following failure of tamoxifen and a third generation aromatase inhibitor

2007 ◽  
Vol 25 (18_suppl) ◽  
pp. 1073-1073
Author(s):  
J. Wang ◽  
S. Jain ◽  
W. Heller ◽  
D. Mackie ◽  
V. Watson ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Estrogen Receptor ◽  
Metastatic Breast Cancer ◽  
Advanced Breast Cancer ◽  
Aromatase Inhibitor ◽  
Endocrine Therapy ◽  
Locally Advanced ◽  
Metastatic Breast ◽  
Advanced Breast ◽  
Third Generation

1073 Background: Endocrine therapy is a key modality in the management of estrogen receptor positive metastatic breast cancer. Fulvestrant (ICI 182,780) is an estrogen receptor downregulator. It has previously been shown to be as effective as anastrozole in patients who had previously progressed on tamoxifen. Methods: A retrospective study was carried out of metastatic breast cancer patients treated at Charing Cross Hospital between 2002–2005 who had received fulvestrant following treatment failure with tamoxifen and a third generation aromatase inhibitor. All patients were postmenopausal and received fulvestrant 250mg IM every 28 days. Measurable disease was assessed by response evaluation criteria in solid tumors (RECIST). Results: A total of 45 patients were identified with a median age of 60 (range 36 to 90). The ER status was known in 95% (n=43) of patients and was positive in all cases, it was unknown in 2% (n=2). At the time of commencing fulvestrant, 96% (n=43) had metastatic disease and 4% (n=2) locally advanced disease. All patients had received at least 2 lines of prior endocrine therapy (including adjuvant therapy), at time of starting fulvestrant the median number of prior regimens was 3 (range 3–5). Fulvestrant was administered for a median of 4 months (range 1 to 20 months), with 4 patients currently still receiving therapy as of 1 November 2006. Of the 45 patients, 2.2% (n=1) achieved a partial response, while 31% (n=14) achieved stable disease for at least 6 months. Thus, 33.3% (n=15) obtained clinical benefit (defined as PR or SD for at least 6 months). The response rates based on line of therapy will be presented. Of the 45 patients, 41 were evaluable for survival data. The median survival of the remaining patients from the start of fulvestrant therapy was 9 months (range 1 to 48 months). Of the 44 patients, 14% (n=6) remain alive. The treatment was well tolerated and toxicity data will be presented. Conclusions: Fulvestrant is well tolerated and is efficacious as treatment for advanced breast cancer that has failed tamoxifen and a third generation aromatase inhibitors. No significant financial relationships to disclose.

Leveraging Antiprogestins in the Treatment of Metastatic Breast Cancer

Endocrinology ◽  
2021 ◽  
Author(s):  
Sailaja Kamaraju ◽  
Amy M Fowler ◽  
Elizabeth Weil ◽  
Kari B Wisinski ◽  
Thu H Truong ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Estrogen Receptor ◽  
Metastatic Breast Cancer ◽  
Endocrine Therapy ◽  
Kinase Inhibitors ◽  
Treatment Options ◽  
Endocrine Resistance ◽  
Metastatic Breast ◽  
Mtor Inhibitors ◽  
Mammary Tissue

Abstract Although incurable, the prognosis for patients with metastatic breast cancer (MBC) has considerably improved with the approvals of multiple targeted and cytotoxic therapies. For hormone receptor-positive (HR+), i.e., estrogen receptor and progesterone receptor positive (ER+/PgR+) and Human Epidermal Growth Factor Receptor-2 negative (i.e.,ERBB2 gene non-amplified or HER2-) MBC, current approved treatment options include palliative endocrine therapy (ET), Cyclin-Dependent Kinase (CDK 4/6) inhibitors, mTOR inhibitors, and PI3 kinase inhibitors. Most treatments target ER+ disease regardless of PgR status. Although the presence of PgR is crucial for ER+ cell proliferation in both normal and malignant mammary tissue, currently, no approved treatments specifically target PgR. Recent literature has demonstrated, the potential of antiprogestins in the treatment of MBC both in preclinical and clinical studies.Antiprogestins, including selective PgR modulators (SPRMs) that act as PgR antagonists, are a promising class of therapeutics for overcoming endocrine resistance in patients who develop activating estrogen receptor 1 (ESR1) and phosphatidylinositol 3-kinase (PI3K) gene mutations after prior endocrine therapy. Herein, we summarize the role of PgR and antiprogestins in the treatment of MBC. Other aspects on the use of functional imaging, clinical trials incorporating novel antiprogestins and potential treatment combinations to overcome endocrine resistance will be briefly discussed.

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