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This phase II trial studies how well the combination of avelumab with liposomal doxorubicin with or without binimetinib, or the combination of avelumab with sacituzumab govitecan works in treating patients with triple negative breast cancer that is stage IV or is not able to be removed by surgery (unresectable) and has come back (recurrent). Immunotherapy with checkpoint inhibitors like avelumab require activation of the patient's immune system. This trial includes a two week induction or lead-in of medications that can stimulate the immune system. It is our hope that this induction will improve the response to immunotherapy with avelumab. One treatment, sacituzumab govitecan, is a monoclonal antibody called sacituzumab linked to a chemotherapy drug called SN-38. Sacituzumab govitecan is a form of targeted therapy because it attaches to specific molecules (receptors) on the surface of tumor cells, known as TROP2 receptors, and delivers SN-38 to kill them. Another treatment, liposomal doxorubicin, is a form of the anticancer drug doxorubicin that is contained in very tiny, fat-like particles. It may have fewer side effects and work better than doxorubicin, and may enhance factors associated with immune response. The third medication is called binimetinib, which may stop the growth of tumor cells by blocking some of the enzymes needed for cell growth, and may help activate the immune system. It is not yet known whether giving avelumab in combination with liposomal doxorubicin with or without binimetinib, or the combination of avelumab with sacituzumab govitecan will work better in treating patients with triple negative breast cancer.

This phase II trial studies how well talazoparib works for the treatment of breast cancer with a BRCA 1 or BRCA 2 gene mutation that has spread to other places in the body (metastatic). Talazoparib is a study drug that inhibits (stops) the normal activity of certain proteins called poly (ADP-ribose) polymerases also called PARPs. PARPs are proteins that help repair deoxyribonucleic acid (DNA) mutations. PARP inhibitors, such as talazoparib, can keep PARP from working, so tumor cells can't repair themselves, and they may stop growing. PARPs are needed to repair mistakes that can happen in DNA when cells divide. If the mistakes are not repaired, the defective cell will usually die and be replaced. Cells with mistakes in their DNA that do not die can become tumor cells. Tumor cells may be killed by a study drug, like talazoparib, that stops the normal activity of PARPs. Talazoparib may be effective in the treatment of metastatic breast cancer with BRCA1 or BRCA2 mutations.

The goal of this trial is to see if active surveillance monitoring and hormonal therapy in
patients diagnosed with ductal cell carcinoma in situ (DCIS), an early stage of breast
cancer, can be an effective management of the disease.

Participants will be asked to receive control hormonal therapy or an investigational hormonal
therapy treatment. Participants will be asked to return for evaluation with MRI at three
months and six months. Depending on the evaluation participants will have the option to
continue on the treatment. If the evaluation suggests surgery is recommended, the participant
will discontinue the study treatment and will undergo surgery. In addition to the treatment
and MRI evaluation, participants will be asked to provide blood sample to understand their
immune status, provide saliva sample for genetic testing, provide the study with a portion of
the tissue or slides generated from tissue removed during surgery performed as part of their
standard of care.

This open-label research study is studying (Z)-endoxifen as a possible treatment for
pre-menopausal (still having periods) women with ER+/HER2- breast cancer. (Z)-endoxifen is a
selective estrogen receptor modulator or "SERM." SERMs work to treat cancer by blocking the
body's natural estrogen from binding to cancer cells. This study includes a pharmacokinetic
part (PK, how the drug works in your body) and a treatment part. The primary purpose of the
study is to see how (Z)-endoxifen works on tumor cell growth by monitoring a cancer marker
called Ki-67. Ki-67 will be measured by biopsy of the breast after about 4 weeks of
treatment. If your cancer is responding to treatment based on the Ki-67 results, you may
continue treatment up to 24 weeks or until surgery.

The PK part of the study will be enrolled first, enrolling about 18 study participants who
will all receive oral once daily (Z)-endoxifen treatment. 12 of these participants will be
randomly assigned to treatment with an equal (50/50) chance to be assigned to (Z)-endoxifen
or (Z)-endoxifen + goserelin (a medication given to block the ovaries from making estrogen
and is also called ovarian suppression). This part of the study will help select the dose of
(Z)-endoxifen to use in the treatment part by measuring the levels of (Z)-endoxifen in the
blood stream and determine how long it takes for the body to remove it.

About 160 study participants will be enrolled in the treatment part. The treatment part will
help to determine how oral once daily (Z)-endoxifen, when taken by itself, compares to oral
once daily exemestane (a medication that decreases the amount of estrogen in the body, also
known as an aromatase inhibitor) and monthly injections of goserelin. Exemestane and
goserelin taken together is a standard treatment regimen for premenopausal patients with
ER+/HER2- breast cancer. Study participants are randomly assigned to treatment with an equal
(50/50) chance to be assigned to (Z)-endoxifen or standard treatment.

Study participation is up to 24 weeks of treatment followed by surgery.

This phase II trial compares the effect of capecitabine to endocrine therapy in patients with non-Luminal A hormone receptor-positive breast cancer that has spread from where it first started (primary site) to other places in the body (metastatic). In this study, patients submit a sample of tumor for testing to determine if their breast cancer is considered non-Luminal A. Only patients with non-Luminal A receive study treatment. In the future, doctors hope that this test can assist in picking the best treatment for patients with this type of cancer. Capecitabine is in a class of medications called antimetabolites. It is taken up by tumor cells and breaks down into fluorouracil, a substance that kills tumor cells. Endocrine therapy is treatment that adds, blocks, or removes hormones. To slow or stop the growth of certain cancers (such as prostate and breast cancer), synthetic hormones or other drugs may be given to block the body's natural hormones. Giving capecitabine as compared to endocrine therapy may kill more tumor cells in patients with metastatic breast cancer.

This phase II trial investigates how well sacituzumab govitecan and atezolizumab work in preventing triple negative breast cancer from coming back (recurrence). Atezolizumab is a protein that affects the immune system by blocking the PD-L1 pathway. The PD-L1 pathway controls the bodys natural immune response, but for some types of cancer the immune system does not work as it should and is prevented from attacking tumors. Atezolizumab works by blocking the PD-L1 pathway, which may help the immune system identify and catch tumor cells. Sacituzumab govitecan is a monoclonal antibody, called sacituzumab, linked to a chemotherapy drug, called SN-38. Sacituzumab is a form of targeted therapy because it attaches to specific molecules (receptors) on the surface of cancer cells, known as TROP2 receptors, and delivers SN-38 to kill them. Giving sacituzumab govitecan and atezolizumab may work as a treatment for residual cancer in the breast or lymph nodes.

This ComboMATCH patient screening trial is the gateway to a coordinated set of clinical trials to study cancer treatment directed by genetic testing. Patients with solid tumors that have spread to nearby tissue or lymph nodes (locally advanced) or have spread to other places in the body (advanced) and have progressed on at least one line of standard systemic therapy or have no standard treatment that has been shown to prolong overall survival may be candidates for these trials. Genetic tests look at the unique genetic material (genes) of patients' tumor cells. Patients with some genetic changes or abnormalities (mutations) may benefit from treatment that targets that particular genetic mutation. ComboMATCH is designed to match patients to a treatment that may work to control their tumor and may help doctors plan better treatment for patients with locally advanced or advanced solid tumors.

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.