Ciara O'Sullivan, M.B., B.Ch.

The purpose of this study is to compare the efficacy of zanidatamab plus chemotherapy versus trastuzumab plus chemotherapy.

The purpose of this stduy is to examine the efficacy of computerized cognitive training methods on perceived cognitive impairment in breast cancer survivors.

The purpose of this study is to determine if tucatinib works better than placebo when given with other drugs to treat participants with HER2-positive breast cancer. A placebo is a pill that looks the same as tucatinib but has no medicine in it. This study will also test what side effects happen when participants take this combination of drugs. A side effect is anything a drug does to the body besides treating your disease. Participants will have cancer that has spread in the body near where it started (locally advanced) and cannot be removed (unresectable) or has spread through the body (metastatic). In this study, all participants will get either tucatinib or placebo. Participants will be assigned randomly to a group. This is a blinded study, so patients and their doctors will not know which group a participant is in. All participants will also get trastuzumab and pertuzumab. These are 2 drugs used to treat this type of cancer.

The purpose of this stduy is to examine the efficacy of computerized cognitive training methods on perceived cognitive impairment in breast cancer survivors.

This research trial studies genetic profiles in blood and tumor samples from patients with estrogen receptor positive and HER2 negative breast cancer that has spread to other places in the body who are receiving palbociclib and endocrine therapy. Examine the genetic changes associated with the cancer and comparing the genetic material from the cancer tissue with the genetic material found in the blood may help doctors to develop customized treatment for breast cancer.