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?

This phase III trial compares the effect of continuation of treatment with pembrolizumab (usual approach) to observation only at preventing cancer from coming back in patients with early-stage triple-negative breast cancer (TNBC) who achieved a pathologic complete response after preoperative chemotherapy in combination with pembrolizumab. The usual approach for patients with early-stage TNBC who receive preoperative chemotherapy plus pembrolizumab is to continue to receive pembrolizumab for up to 27 weeks after surgery. Immunotherapy with monoclonal antibodies, such as pembrolizumab, may help the body's immune system attack the cancer, and may interfere with the ability of tumor cells to grow and spread. This trial may help researchers determine if observation is as good as receiving pembrolizumab for 27 weeks after surgery in triple-negative breast cancer patients who achieved a pathologic complete response after preoperative treatment with chemotherapy and pembrolizumab.

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 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 Ib trial tests the safety and tolerability of ZEN003694 in combination with an immunotherapy drug called pembrolizumab and the usual chemotherapy approach with nab-paclitaxel for the treatment of patients with triple negative-negative breast cancer that has spread to other parts of the body (advanced). Paclitaxel is in a class of medications called antimicrotubule agents. It stops cancer cells from growing and dividing and may kill them. Nab-paclitaxel is an albumin-stabilized nanoparticle formulation of paclitaxel which may have fewer side effects and work better than other forms of paclitaxel. Immunotherapy with monoclonal antibodies, such as pembrolizumab may help the body's immune system attach the cancer and may interfere with the ability of tumor cells to grow and spread. ZEN003694 is an inhibitor of a family of proteins called the bromodomain and extra-terminal (BET). It may prevent the growth of tumor cells that over produce BET protein. Combination therapy with ZEN003694 pembrolizumab immunotherapy and nab-paclitaxel chemotherapy may help shrink or stabilize cancer for longer than chemotherapy alone.

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 is a Phase III open-label study to assess if camizestrant improves outcomes compared to
standard adjuvant endocrine therapy for patients with ER+/HER2- early breast cancer with
intermediate-high or high risk for disease recurrence who completed definitive locoregional
therapy (with or without chemotherapy). The planned duration of treatment in either arm
within the study will be 7 years.