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This phase II trial studies the effect of hormonal therapy given after (adjuvant) combination pertuzumab/trastuzumab in treating patients with hormone receptor positive, HER2 positive breast cancer. The drugs trastuzumab and pertuzumab are both monoclonal antibodies, which are disease-fighting proteins made by cloned immune cells. Estrogen can cause the growth of breast cancer cells. Hormonal therapy, such as letrozole, anastrozole, exemestane, and tamoxifen, block the use of estrogen by the tumor cells. Giving hormonal therapy after pertuzumab and trastuzumab may kill any remaining tumor cells in patients with breast cancer.

This phase III trial compares the effect of usual treatment with trastuzumab emtansine (T-DM1) alone vs. T-DM1 in combination with tucatinib. T-DM1 is a monoclonal antibody, called trastuzumab, linked to a chemotherapy drug, called DM1. Trastuzumab is a form of targeted therapy because it attaches to specific molecules (receptors) on the surface of cancer cells, known as HER2 receptors, and delivers DM1 to kill them. Tucatinib blocks HER2, which may help keep cancer cells from growing and may kill them. Giving T-DM1 in combination with tucatinib may work better in preventing breast cancer from relapsing in patients with HER2 positive breast cancer compared to T-DM1 alone.

This phase III trial compares the effect of radiation therapy combined with hormonal therapy versus hormonal therapy alone in treating patients with low risk, early stage breast cancer with Oncotype Dx Recurrence =< 18. Oncotype DX is a laboratory test which results in a score that is used to help predict whether breast cancer will spread to other parts of the body or come back. Radiation therapy uses high doses of radiation to kill cancer cells and shrink tumors but may result in some side effects. Hormones called estrogen and progesterone may contribute to the growth of breast tumor cells. Hormone therapy, also called endocrine therapy, may stop the growth of tumor cells by blocking or removing these hormones. This clinical trial may help researchers understand if patients with low-risk, early stage breast cancer who have Oncotype recurrence score of =< 18 can safely omit radiation therapy and only be treated with hormonal therapy without losing any radiation treatment benefit.

This trial uses fluid measurements of the arm and MRI to determine biomarkers of lymphatic dysfunction in patients with breast cancer. Studying the lymphatic system (the part of your body that helps to process and clear waste products) in different ways will help doctors understand more about lymphedema (excess fluid after lymph nodes are removed) and help with prevention and management of lymphedema in patients with breast cancer.

This randomized phase III trial studies digital tomosynthesis mammography and digital mammography in screening patients for breast cancer. Screening for breast cancer with tomosynthesis mammography may be superior to digital mammography for breast cancer screening and may help reduce the need for additional imaging or treatment.

This is a multicenter, Phase 1b/2 trial. The phase 1b part of the trial aims to determine the
RP2D of elacestrant when administered in combination with alpelisib, everolimus, palbociclib,
and ribociclib. The Phase 2 part of the trial will evaluate the efficacy and safety of the
various combinations in patients with ER+/HER2- advanced/metastatic breast cancer.

The goal of this clinical trial is to evaluate the safety of TOS-358 in adults with select
solid tumors who meet study enrollment criteria. The main questions it aims to answer are:

1. what is the maximum tolerated dose and recommended dose for phase 2?

2. how safe and tolerable is TOS-358 at different dose levels when taken orally once or
twice per day?