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A phase 3 study of ARV-471 compared to fulvestrant in adults with advanced ER+/HER2- breast cancer that has progressed after prior treatment
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A phase 3 study of ARV-471 compared to fulvestrant in adults with advanced ER+/HER2- breast cancer that has progressed after prior treatment
Learn moreA phase 1b/2 study of ARV-471 when given with other medicines in people with ER+/HER-2 advanced or metastatic breast cancer
Learn moreA phase 2 study of a combination therapy (PF-07220060 and PF-07104091) when given with endocrine therapy in adults with advanced or metastatic ER+/HER2- breast cancer
Learn moreA phase 3 study of ARV-471 + palbociclib compared to letrozole + palbociclib in adults with previously untreated advanced ER+/HER2- breast cancer




People of color continue to be underrepresented in global clinical trials. Together, Pfizer, Inc. and the Tigerlily Foundation are helping to tackle barriers to equitable care for women of color and patient…
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Karen, a stage 4 triple negative breast cancer survivor, shares her experience as a previous clinical trial participant.
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Deltra, as a metastatic breast cancer patient, talks about the importance of knowing your available treatment options.
Watch videoWhat is breast cancer?
Breast cancer is a type of cancer that starts in one or both breasts; cancer begins when cells start to grow out of control. Though it occurs mostly in women, men can get breast cancer. Each year about 2.3 million people are diagnosed with breast cancer globally.
What is metastatic or advanced breast cancer?
Metastatic breast cancer—sometimes called advanced or Stage IV breast cancer—is breast cancer that has spread beyond the breast, most commonly to the lungs, bones, liver, and brain. It is the most advanced stage of breast cancer. Even though metastatic breast cancer is in another part of the body, it is still made up of breast cancer cells and is treated as breast cancer. There are a number of treatments and research options for people living with metastatic breast cancer.
Why are the Pfizer breast cancer clinical trials being conducted?
The Pfizer breast cancer clinical trials are being conducted to see if study medicines may help stop or slow the spread of breast cancer.