Purpose: To study the safety, best dose, and effects (good and bad) of alisertib, an experimental AURKA inhibitor, with standard of care hormone therapy.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) hormone receptor positive (ER+ and/or PR+), HER2 negative (HER2-) breast cancer who have received at least two hormone therapies including a CDK4/6 inhibitor with hormone therapy for advanced disease. You must not have received chemotherapy for advanced disease. View full eligibility criteria

Purpose: To study the anti-cancer activity and safety of giving the experimental anti-estrogen therapy giredestrant alone or with a CDK 4/6 inhibitor, an AKT inhibitor, a PI3K inhibitor, or chemotherapy.

Who is this for?: Women with advanced (some stage III) or metastatic (stage IV) estrogen-receptor positive (ER+), HER2-negative (HER2-) breast cancer whose disease progressed while taking anti-hormone therapy with a CDK 4/6 inhibitor and who have not received chemotherapy for metastatic disease. View full eligibility criteria

Purpose: To study the safety, best dose, effects (good and bad), and anti-cancer activity of niraparib PARP inhibitor with irinotecan chemotherapy.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) breast cancer with a BRCA1, BRCA2, ATM, and/or PALB2 mutation. View full eligibility criteria

Purpose: To study the safety, effects (good and bad), and anti-cancer activity of adding tucatinib (Tukysa®) tyrosine kinase inhibitor to standard of care trastuzumab (Herceptin®) or pertuzumab (Perjeta®) anti-HER2 targeted therapy or trastuzumab emtansine (Kadcyla®, T-DM1) antibody drug conjugate.

Who is this for?: People with metastatic (stage IV) HER2 positive (HER2+) breast cancer that has spread to the brain (brain metastasis) who are receiving their first line of metastatic treatment with trastuzumab (Herceptin®) or pertuzumab (Perjeta®) or second line of metastatic treatment with trastuzumab emtansine (Kadcyla®, T-DM1). You must not have received whole brain radiation therapy. View full eligibility criteria

Purpose: To study the safety, best dose, effects (good and bad), and anti-cancer activity of NBTXR3, an experimental nanoparticle, and stereotaxic ablative radiotherapy, with nivolumab (Opdivo®) or pembrolizumab (Keytruda®) PD-1 inhibitor.

Who is this for?: People with metastatic (stage IV) breast cancer that has spread to the soft tissues, lungs, or liver. View full eligibility criteria

Purpose: To study the safety, best dose, effects (good and bad), and anti-cancer activity of GSK4381562 (SRF813), an experimental immunotherapy, alone and with dostarlimab (Jemperli®), a type of immunotherapy called a PD-1 inhibitor.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) breast cancer that has progressed on standard treatment. View full eligibility criteria

Purpose: To study the anti-cancer activity of the PARP inhibitor Talazoparib (Talzenna®) in breast cancer tumors that test positive for a tumor (not inherited) BRCA 1 or BRCA 2 mutation.

Who is this for?: Women with metastatic (stage IV) triple negative (ER-, PR-, HER2-) or hormone positive (ER+ and/or PR+), HER2 negative (HER2-) breast cancer. Your tumor must test positive for a BRCA 1 or a BRCA 2 tumor (not inherited) mutation. View full eligibility criteria

Purpose: To look at the safety and effects (good and bad) of combining the immunotherapy drug avelumab (Bavencio®) with binimetinib, utomilumab, or PF-04518600.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) triple negative (ER-, PR- and HER2-) or ER Low (1%-10% ER) breast cancer who have not had more than three lines of chemotherapy and not more than one checkpoint inhibitor. View full eligibility criteria

Purpose: To study the safety, side effects, dose, and anti-cancer activity of giving PF-07248144 alone, in combination with fulvestrant, or with palbociclib and letrozole.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) estrogen-receptor positive (ER+), HER2-negative (HER2-) breast cancer whose disease progressed after receiving a CDK 4/6 inhibitor and anti-estrogen therapy. View full eligibility criteria

Purpose: To study the safety, effects (good and bad), and anti-cancer activity of using a tumor's genetic profile to select an FDA-approved targeted therapy.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) breast cancer with no standard treatment options. You must have results from a genomic or immunohistochemistry test approved by TAPUR. View full eligibility criteria

Purpose: To study the safety, best dose, effects (good and bad), and anti-cancer activity of ASTX727, an experimental targeted therapy, with olaparib (Lynparza®) PARP inhibitor.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) breast cancer with BRCA1, BRCA2, PALB2, ATM, and/or CHEK2 inherited or tumor mutations who have no standard treatment options available. View full eligibility criteria

Purpose: To study the safety, anti-cancer activity, and side effects of the investigational antibody-drug conjugate ARX788.

Who is this for?: People with metastatic (stage IV) HER2 positive (HER2+) breast cancer who have already received tucatinib (Tukysa®), T-DM1 (Kadcyla®), or trastuzumab deruxtecan (Enhertu®) in the metastatic setting. View full eligibility criteria

Purpose: To collect tumor samples that will be used to develop OncoPrism™, a test that helps providers predict response to immunotherapy.

Who is this for?: People with stage I, stage II, stage III, or stage IV (metastatic) triple negative (ER-, PR-, HER2-) breast cancer who have received or are planning to receive treatment with a PD-1/PD-L1 inhibitor. You must have received a biopsy before beginning treatment with a PD-1/PD-L1 inhibitor. View full eligibility criteria

Purpose: To study the safety, best dose, effects (good and bad), and anti-cancer activity of IMP1734, an experimental PARP inhibitor.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) breast cancer who have received chemotherapy and 0-1 lines of a PARP inhibitor. You must have a BRCA1, BRCA2, PALB2, ATM, ATR, CHEK2, FANCA, MLH1, MRE11A, NBN, RAD51C, CDK12, or other homologous recombination repair (HRR) mutation. View full eligibility criteria

Purpose: To study the safety, best dose, effects (good and bad), and anti-cancer activity of disitamab vedotin, an experimental antibody drug conjugate (ADC).

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) HER2 low or HER2 positive (HER2+) breast cancer who have received trastuzumab deruxtecan (Enhertu®) or sacituzumab govitecan (Trodelvy®). View full eligibility criteria

Purpose: To study the safety, best dose, effects (good and bad), and anti-cancer activity of AZD9574, an experimental PARP inhibitor.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) HER2 negative (HER2-) breast cancer with a tumor or inherited BRCA1, BRCA2, PALB2, RAD51C, or RAD51D mutation. You must not have received treatment with a PARP inhibitor. You must have at least 1 tumor that has not been treated with radiation. View full eligibility criteria

Purpose: To study the safety, effects (good and bad), and best dose of DF1001 when it is given alone or with pembrolizumab (Keytruda®).

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) breast cancer that tests HER2 1+, 2+ or 3+ on the IHC (immunohistochemistry) tumor test and have not had more than three lines of chemotherapy. View full eligibility criteria

Purpose: To study the safety, best dose, and effects (good and bad) of MOMA-313, an experimental DNA polymerase theta inhibitor, alone or with olaparib (Lynparza®) PARP inhibitor.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) breast cancer with a BRCA1, BRCA2, PALB2, ATM, or CHEK2 mutation. View full eligibility criteria

Purpose: To study the dose, safety, side effects, and anti-cancer activity of giving the targeted therapies capivasertib and palbociclib (Ibrance®) with the anti-estrogen therapy fulvestrant (Faslodex®).

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) estrogen receptor-positive (ER+), HER2-negative (HER2-) breast cancer. Your cancer must have progressed on anti-estrogen therapy. View full eligibility criteria

Purpose: To study the safety, best dose, effects (good and bad), and anti-cancer activity of elacestrant (Orserdu®) hormone therapy in combination with other anti-cancer therapies.

Who is this for?: People with metastatic (stage IV) estrogen receptor positive (ER+), HER2 negative (HER2-) breast cancer who have not received treatment with chemotherapy or elacestrant (Orserdu®) for advanced/metastatic disease. View full eligibility criteria

Purpose: To study the safety, best dose, and effects (good and bad) of 177Lu-FAP-2286, an experimental radioactive drug.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) breast cancer who have received at least 2 lines of therapy for advanced disease. View full eligibility criteria

Purpose: To compare the safety, effects (good and bad), and anti-cancer activity of stereotactic radiosurgery (radiation) before and after surgery.

Who is this for?: People with metastatic (stage IV) breast cancer that has spread to the brain (brain metastasis) who are planning to receive brain surgery. You must have at least 1 brain tumor that has not been treated with radiation. View full eligibility criteria

Purpose: To study the safety, effects (good and bad), and anti-cancer activity of enzalutamide (Xtandi®), an experimental hormone therapy, alone or with mifepristone, an experimental hormone therapy, compared to standard of care chemotherapy.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) triple negative (ER- or ER low, PR- or PR low, HER2-) or ER low, androgen receptor positive (AR+) breast cancer who have received 0-1 lines of chemotherapy for advanced disease. View full eligibility criteria

Purpose: To study the potential benefits and harms of cannabis products for cancer-related symptoms.

Who is this for?: People with stage I, stage II, stage III, or stage IV (metastatic) breast cancer who are planning to receive or are receiving (within 2 months) treatment with chemotherapy, targeted therapy, and/or an immune checkpoint inhibitor (pembrolizumab (Keytruda®) or dostarlimab (Jemperli®)). You must be using cannabis products. View full eligibility criteria

Purpose: To study the safety, effects (good and bad), and anti-cancer activity of OP-1250, an experimental hormone therapy, with ribociclib (Kisqali®) CDK 4/6 inhibitor or alpelisib (Piqray®) PI3K inhibitor.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) hormone receptor positive (ER+ and/or PR+), HER2 negative (HER2-) breast cancer who have received 1-2 hormone therapies for advanced or metastatic disease. You must not have received more than 1 chemotherapy for advanced or metastatic disease. View full eligibility criteria

Purpose: To use genetic testing to match people to treatments and help doctors plan better treatments.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) breast cancer who have received at least 1 line of therapy for advanced disease or who have no standard treatment options available. View full eligibility criteria

Purpose: To study the safety, best dose, effects (good and bad), and anti-cancer activity of STX-478, an experimental PI3K inhibitor, alone or with fulvestrant (Faslodex®) hormone therapy.

Who is this for?: People with advanced (stage III) or metastatic (stage IV) hormone receptor positive (ER+ and/or PR+), HER2 negative (HER2-) breast cancer with a PI3K mutation. You must not have a PTEN, AKT, or mTOR mutation. View full eligibility criteria

Purpose: To study the safety, effects (good and bad), and anti-cancer activity of NX-1607, an experimental CBL-B inhibitor.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) triple negative (ER-, PR-, HER2-) breast cancer with no standard treatment options available. View full eligibility criteria

Purpose: To study the safety, effects (good and bad), and anti-cancer activity of IDE161, a PARG inhibitor.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) breast cancer with a BRCA1/2 mutation whose cancer has progressed on at least one previous therapy. View full eligibility criteria

Purpose: To study the safety, effects (good and bad), and anti-cancer activity of ABBV-400, an experimental antibody drug conjugate (ADC).

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) triple negative (ER-, PR-, HER2-) or hormone receptor positive (ER+ and/or PR), HER2 negative (HER2-) breast cancer. View full eligibility criteria

Purpose: To study the safety, best dose, effects (good and bad), and anti-cancer activity of ARV-471, an experimental PROTAC protein degrader, with ribociclib (Kisqali®) CDK 4/6 inhibitor.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) estrogen receptor positive (ER+), HER2 negative (HER2-) breast cancer who have received treatment with a CDK 4/6 inhibitor and up to 2 lines of therapy for advanced/metastatic disease. View full eligibility criteria

Purpose: To study the safety, best dose, effects (good and bad), and anti-cancer activity of ORIC-114, an experimental x, alone or with chemotherapy.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) HER2 positive (HER2+) breast cancer who have no standard treatment options available. View full eligibility criteria

Purpose: To create a registry to study metastatic lobular breast cancer, treatment patterns, and overall survival.

Who is this for?: People with stage IV (metastatic) lobular breast cancer. View full eligibility criteria

Purpose: To study if a mass response test can predict your cancer's response to potential treatments.

Who is this for?: People with stage I, stage II, stage III, or metastatic (stage IV) breast cancer that have malignant fluid. View full eligibility criteria

Purpose: To study if blood tests that look for tumor markers are as good as or better than imaging with PET and/or CT scans (the current standard of care) to determine if a tumor is growing.

Who is this for?: People with metastatic (stage IV) hormone positive (ER+ and/or PR+), HER2 negative (HER2-) breast cancer who are planning to have first line treatment for metastatic disease or have started treatment within the past month, and have at least one elevated tumor marker. View full eligibility criteria

Purpose: To study the safety, effects (good and bad), and anti-cancer activity of giredestrant, an experimental hormone therapy, compared with fulvestrant (Faslodex®) hormone therapy in combination with a CDK4/6 inhibitor.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) estrogen receptor positive (ER+), HER2 negative (HER2-) breast cancer who not have received treatment (except for surgery or radiation) for advanced disease. View full eligibility criteria

Purpose: To study if WiseBag and CONCURxP mobile health tools will improve the ability of people to take their medication as prescribed compared to WiseBag alone.

Who is this for?: People with metastatic (stage IV) hormone receptor positive (ER+ and/or PR+), HER2 negative (HER2-) breast cancer who are planning to receive a CDK4/6 inhibitor or started receiving a CDK4/6 inhibitor within the past month. View full eligibility criteria

Purpose: To investigate whether a beta-blocker can help prevent heart problems caused by cancer treatments.

Who is this for?: People with metastatic (stage IV) HER2 positive (HER2+) breast cancer who are receiving or planning to receive trastuzumab (Herceptin®). View full eligibility criteria

Purpose: To compare the safety, effects (good and bad), and anti-cancer activity of standard of care stereotactic radiosurgery (SRS) to experimental fractionated stereotactic radiosurgery (FSRS).

Who is this for?: People with metastatic (stage IV) breast cancer that has spread to the brain (brain metastases) who have not yet received brain radiation. View full eligibility criteria

Purpose: To study the safety, effects (good and bad), and anti-cancer activity of QBS72S, an experimental chemotherapy.

Who is this for?: People with metastatic (stage IV) breast cancer that has spread to the brain (brain metastases) or leptomeningeal metastasis visible on an MRI who have received chemotherapy. If you have brain metastasis, you must have at least 1 lesion that has not received treatment. View full eligibility criteria

Purpose: To study if tumors have HLA gene changes and to store immune cells that will be used to create a future immunotherapy treatment.

Who is this for?: People with some stage III (advanced) or stage IV (metastatic) triple negative (ER-, PR-, HER2-) breast cancer. View full eligibility criteria

Purpose: To study the safety, effects (good and bad), and anti-cancer activity of talazoparib (Talzenna®) PARP inhibitor.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) HER2 negative (HER2-) breast cancer with a PALB2 mutation who have received 0-3 treatments for advanced/metastatic disease. You must not have a BRCA1/2 mutation or received treatment with a PARP inhibitor. View full eligibility criteria

Purpose: To study the safety, best dose, effects (good and bad), and anti-cancer activity of XMT-2056, an experimental antibody drug conjugate (ADC).

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) HER2 positive (HER2+) breast cancer or breast cancer with a HER2 mutation who have received standard treatment. View full eligibility criteria

Purpose: To study the safety, best dose, and effects (good and bad) of [177Lu]Lu-NNS309, an experimental radioactive drug.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) hormone receptor positive (ER+ and/or PR+), HER2 negative (HER2-) or triple negative (ER-, PR-, HER2-) breast cancer who have received at least 2 lines of therapy for advanced disease. View full eligibility criteria

Purpose: To study the safety, anti-cancer activity and side effects of giving an experimental immunotherapy made from cells from your own immune system.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) triple negative (ER-, PR-, HER2-) breast cancer. View full eligibility criteria

Purpose: To study the safety, anti-cancer activity and side effects of giving the experimental antibody-drug conjugate MORAb-202.

Who is this for?: Women with metastatic (stage IV) triple negative (ER-, PR-, HER2-) breast cancer who have already received a platinum-based chemotherapy and whose tumor tests positive for FRA. View full eligibility criteria

Purpose: To study the safety, best dose, and effects (good and bad) of BNT327, an experimental anti-cancer therapy, with chemotherapy.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) triple negative (ER-, PR, HER2-) breast cancer who have received 0-1 lines of therapy for advanced disease. View full eligibility criteria

Purpose: To evaluate the safety and effects (good and bad) of eFT226 (Zotatifin), an experimental targeted therapy that blocks eIF4A1.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) breast cancer that has been treated with standard therapies and tests positive for a mutation in HER2 (ERRB2), ERBB3, FGFR1, FGFR2, or KRAS. View full eligibility criteria

Purpose: To study the safety, effects (good and bad), and anti-cancer activity of gedatolisib, an experimental pan-PI3K and mTOR inhibitor, with fulvestrant (Faslodex®) hormone therapy, with or without palbociclib (Ibrance®) CDK 4/6 inhibitor.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) hormone receptor positive (ER+ and/or PR+), HER2 negative (HER2-) breast cancer with or without a PIK3CA mutation who have received treatment with a CDK 4/6 inhibitor with an aromatase inhibitor. You must not have received more than 1 chemotherapy for advanced disease or 2 lines of hormone therapy. View full eligibility criteria

Purpose: To study the safety, effects (good and bad), and anti-cancer activity of lasofoxifene, an experimental hormone therapy, with abemaciclib (Verzenio®) CDK4/6 inhibitor.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) estrogen receptor positive (ER+), HER2 negative (HER2-) breast cancer with an ESR1 mutation. You must have received an aromatase inhibitor with palbociclib (Ibrance®) or ribociclib (Kisqali®) CDK4/6 inhibitor as your first line of hormone therapy for advanced disease. You must not have received more than 1 line of chemotherapy for advanced disease. View full eligibility criteria

Purpose: To study the safety, best dose, effects (good and bad), and anti-cancer activity of AB598, an experimental CD39 inhibitor.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) triple negative (ER-, PR-, HER2-) breast cancer with no standard treatment options available. View full eligibility criteria

Purpose: To determine the safety, side effects, dose, and anti-cancer activity of AZD8205, and antibody-drug conjugate (ADC).

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) triple negative (ER-, PR-, HER2-) breast cancer. You must not have received more than one line of therapy. View full eligibility criteria

Purpose: To study the safety, best dose, effects (good and bad), and anti-cancer activity of PRO1184, an experimental antibody drug conjugate (ADC).

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) HER2 negative (HER2-) breast cancer that expresses folate receptor alpha (FRA) who have received standard treatment. View full eligibility criteria

Purpose: To study the safety, effects (good and bad), and anti-cancer activity of datopotamab deruxtecan (Dato-DXd), an experimental antibody drug conjugate (ADC), with or without durvalumab immunotherapy compared to standard of care chemotherapy with pembrolizumab immunotherapy.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) triple negative (ER-, PR-, HER2-), PD-L1 positive breast cancer who have not yet received treatment for advanced disease. View full eligibility criteria

Purpose: To study the ability of the BostonGene Tumor Portrait test to provide information about tumors and their microenvironment and help make treatment decisions.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) breast cancer. View full eligibility criteria

Purpose: To study the safety, best dose, effects (good and bad), and anti-cancer activity of ASTX727, an experimental DNA methyltransferase (DNMT) inhibitor, with paclitaxel (Taxol®) chemotherapy and pembrolizumab (Keytruda®) PD-1 inhibitor.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) triple negative (ER-, PR-, HER2-) breast cancer. View full eligibility criteria

Purpose: To study the safety, best dose, effects (good and bad), and anti-cancer activity of DB-1310, an experimental antibody drug conjugate (ADC).

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) breast cancer who have no standard treatment options available. View full eligibility criteria

Purpose: To study the safety and anti-cancer activity of giving chemotherapy, the immunotherapy tremelimumab, and the PD-L1 inhibitor Durvalumab (Imfinzi®) together with or without a personalized synthetic long peptide (SLP) vaccine and Hiltonol® (poly-ICLC) .

Who is this for?: People with metastatic (stage IV) triple negative (ER-, PR-, HER2-) breast cancer that is PD-L1 negative and who have not yet received any treatment for metastatic disease. View full eligibility criteria

Purpose: To study the safety, effects (good and bad), and anti-cancer activity of adding radiation to metastatic breast cancer treatment.

Who is this for?: People with metastatic (stage IV) oligoprogressive breast cancer who have received at least 1 line of therapy for metastatic disease. View full eligibility criteria

Purpose: To study the safety, best dose, and effects (good and bad) of XTX301, an experimental immunotherapy.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) triple negative (ER-, PR-, HER2-) breast cancer who have received no more than 4 lines of therapy for advanced disease. You must not have liver metastases. View full eligibility criteria

Purpose: To study the safety, best dose, effects (good and bad), and anti-cancer activity of SGN-PDL1V, an experimental antibody drug conjugate (ADC).

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) triple negative (ER-, PR-, HER2-) breast cancer who have no standard treatment options available. View full eligibility criteria

Purpose: To study the safety, effects (good and bad), and anti-cancer activity of fermented wheat germ nutritional supplement.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) triple negative (ER-, PR-, HER2-) breast cancer who are planning to receive dostarlimab (Jemperli®) or pembrolizumab (Keytruda®) immune checkpoint inhibitor. View full eligibility criteria

Purpose: To study the safety, effects (good and bad), and anti-cancer activity of DB-1303/BNT323, an experimental antibody drug conjugate (ADC).

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) hormone receptor positive (ER+ or ER low and/or PR+ or PR low), HER2 low breast cancer who have received 1-2 lines of therapy for advanced disease. You must not have received chemotherapy for advanced disease or any anti-HER2 targeted therapy. View full eligibility criteria

Purpose: To study the ability of tart cherry juice to prevent nerve pain during chemotherapy.

Who is this for?: People with stage I, stage II, stage III, or stage IV (metastatic) breast cancer who are planning to receive paclitaxel (Taxol®). You must not have received docetaxel (Taxotere®), nab-paclitaxel (Abraxane®), eribulin (Halaven®), or cisplatin (Platinol®). View full eligibility criteria

Purpose: To collect tissue samples, blood samples, and medical information from people with breast cancer to study how cancer changes over time and during treatment.

Who is this for?: People with stage III or stage IV (metastatic) breast cancer who are receiving or planning to receive treatment. View full eligibility criteria

Purpose: To study the safety, best dose, effects (good and bad), and anti-cancer activity of BMS-986340, an experimental CCR8 inhibitor, alone or with nivolumab (Opdivo®) PD-1 inhibitor.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) breast cancer who have no standard treatment options available. You must have received at least 1 PD-1 inhibitor. View full eligibility criteria

Purpose: To study the safety, effects (good and bad), and anti-cancer activity of inavolisib, an experimental PI3K inhibitor, with Phesgo anti-HER2 targeted therapy.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) HER2 positive (HER2+) breast cancer with a PIK3CA mutation who have not received treatment for advanced disease (except for hormone therapy if HR+). View full eligibility criteria

Purpose: To study the safety, effects (good and bad), and anti-cancer activity of sacituzumab tirumotecan, an experimental antibody drug conjugate (ADC), alone or with pembrolizumab (Keytruda®) immunotherapy compared to standard of care chemotherapy.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) triple negative (ER-, PR-, HER2-) breast cancer who have not yet received treatment for advanced disease. Your cancer must express PD-L1 at a combined positive score (CPS) of less than 10. View full eligibility criteria

Purpose: To study the safety, effects (good and bad), and anti-cancer activity of PF-07220060, an experimental CDK4 inhibitor, with letrozole (Femara®) hormone therapy compared to standard of care treatment.

Who is this for?: People with newly diagnosed advanced (some stage III) or metastatic (stage IV) hormone receptor positive (ER+ and/or PR+), HER2 negative (HER2-) breast cancer who have not yet received treatment for advanced disease. View full eligibility criteria

Purpose: To study the safety, best dose, and effects (good and bad) of RLY-2608 alone and in combination with fulvestrant (Faslodex®).

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) hormone receptor positive (ER+ and/or PR+), HER2 negative (HER2-) breast cancer with a PIK3CA mutation. View full eligibility criteria

Purpose: To study the safety, effects (good and bad), and anti-cancer activity of belzutifan (MK-6482), an experimental targeted therapy, with hormone therapy compared to standard of care targeted therapy and hormone therapy.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) estrogen receptor positive (ER+), HER2 negative (HER2-) breast cancer who have received at least 1 line of hormone therapy for advanced disease. You must not have received chemotherapy or a PARP inhibitor for advanced disease. View full eligibility criteria

Purpose: To study the safety, effects (good and bad), and anti-cancer activity of the Bria-IMT regimen, an experimental cell therapy, alone and with retifanlimab (Zynyz®) PD-1 inhibitor.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) breast cancer who have no standard treatment options available. View full eligibility criteria

Purpose: To study the safety, effects (good and bad), and anti-cancer activity of utidelone (UTD1), an experimental chemotherapy, with capecitabine (Xeloda®) chemotherapy.

Who is this for?: People with metastatic (stage IV) HER2 negative (HER2-) or HER2 low breast cancer that has spread to the brain (brain metastases) who have received no more than 3 lines of chemotherapy for metastatic disease. You must not have leptomeningeal metastasis (leptomeningeal disease). View full eligibility criteria

Purpose: To study the safety, effects (good and bad), and anti-cancer activity of eniluracil (PCS6422), an experimental DPD inhibitor, with capecitabine (Xeloda®) compared to capecitabine (Xeloda®) alone.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) HER2 negative (HER2-) breast cancer who have received chemotherapy for advanced disease. View full eligibility criteria

Purpose: To compare the anti-cancer activity and side effects of stereotaxic radiation with memory-sparing, whole-brain radiation, To preserve memory, radiation will avoid the hippocampus, an area of the brain associated with memory, and be given with Memantine, a drug used to treat memory loss caused by dementia.

Who is this for?: People with metastatic (stage IV) breast cancer and 5-15 brain metastases. You must not have received prior radiation or surgery for brain metastases (mets). View full eligibility criteria

Purpose: To study the safety, effects (good and bad), and anti-cancer activity of BBI-355, an inhibitor of checkpoint kinase 1 (CHK1).

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) breast cancer that has advanced on all available treatments. Your tumor must show evidence of oncogene amplification. View full eligibility criteria

Purpose: To study the safety, best dose, effects (good and bad), and anti-cancer activity of ribociclib (Kisqali®), trastuzumab (Herceptin®), and tucatinib (Tukysa®) targeted therapies alone or with fulvestrant (Faslodex®) hormone therapy.

Who is this for?: People with stage II, stage III, or stage IV (metastatic) HER2 positive (HER2+) or HER2 low breast cancer. If you have stage II or some stage III breast cancer, you must not have received treatment or surgery. If you have advanced (some stage III) or metastatic (stage IV) breast cancer, you must have received at least 1 line of anti-HER2 targeted therapy for metastatic disease. View full eligibility criteria

Purpose: To compare the safety, effects (good and bad), and anti-cancer activity of saruparib, an experimental PARP1 inhibitor, with camizestrant, an experimental hormone therapy, to standard of care CDK4/6 inhibitor with hormone therapy.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) hormone receptor positive (ER+ and/or PR+), HER2 negative (HER2-) or HER2 low (IHC 1+ or IHC 2+/ISH-) breast cancer with BRCA1, BRCA2, or PALB2 mutations. View full eligibility criteria

Purpose: To study where 68Ga-FAPi-46 and 68Ga-PSMA-11 accumulate in normal and cancer tissues and whether PET/CT scans with 68Ga-FAPi-46 and 68Ga-PSMA-11 can help locate cancer in the body.

Who is this for?: People with stage I, stage II, stage III, or stage IV (metastatic) breast cancer who are planning to receive surgery to remove the primary tumor and/or metastasis. View full eligibility criteria

Purpose: To study how well PET scans with an experimental tracer can identify immune cell activity, which may help predict response to immunotherapy.

Who is this for?: People with metastatic (stage IV) breast cancer that has spread to the brain (brain metastasis) who are planning to receive brain surgery. View full eligibility criteria

Purpose: To study the safety, effects (good and bad), and anti-cancer activity of IAM1363, an experimental anti-HER2 targeted therapy.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) HER2 positive (HER2+) or HER2 mutated breast cancer who have received at least 1 line of therapy for advanced disease. View full eligibility criteria