Purpose: To study the safety, effects (good and bad), and anti-cancer activity of RLY-2608 PI3Kα inhibitor plus fulvestrant (Faslodex®) hormone therapy versus capivasertib (Truqap®) AKT inhibitor plus 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 whose cancer has progressed while receiving 1 or 2 lines of hormone therapy and a CDK4/6 inhibitor. You must not have received certain treatments that are listed below. 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 study the safety, effects (good and bad), and anti-cancer activity of MBRC-201 antibody-drug conjugate.

Who is this for?: People with metastatic (stage IV) breast cancer that is resistant to standard therapies. You must not have received trastuzumab deruxtecan (Enhertu®), datopotamab deruxtecan (Datroway®), or sacituzumab govitecan (Trodelvy®). 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 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, best dose, effects (good and bad), and anti-cancer activity of XMT-1660, 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, 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, best dose, and effects (good and bad) of CLSP-1025, an experimental immunotherapy.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) HLA-A*02:01 positive breast cancer with p53 R175H mutations who have no standard treatment options available. View full eligibility criteria

Purpose: To study the safety, best dose, and effects (good and bad) of BBO-10203, an experimental targeted therapy, with trastuzumab (Herceptin®) anti-HER2 targeted therapy.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) HER2 positive (HER2+) breast cancer who have received at least 2 lines of anti-HER2 targeted therapy or hormone receptor positive (ER+ and/or PR+), HER2 negative (HER2-) breast cancer who have no standard treatment options available. 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, best dose, effects (good and bad), and anti-cancer activity of ETX-636, an experimental targeted therapy, with fulvestrant (Faslodex®) 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 with PIK3CA mutations who have received at least 1 CDK4/6 inhibitor and hormone 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 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 anti-cancer activity of zanidatamab, an experimental anti-HER2 targeted therapy, with chemotherapy compared to trastuzumab (Herceptin®) anti-HER2 targeted therapy with chemotherapy.

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

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 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 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 test the safety and effectiveness of the sequence of 2 types of antibody drug conjugates (ADCs) to learn whether the treatment works for people with metastatic HER2 low breast cancer.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) HER2 low breast cancer. You must not have received more than 2 lines of chemotherapy or antibody drug conjugates for advanced disease. View full eligibility criteria

Purpose: To study the safety, effects (good and bad), and anti-cancer activity of GDC-4198 CDK2/4/6 inhibitor and giredestrant oral SERD compared with abemaciclib (Verzenio®) CDK4/6 inhibitor and giredestrant.

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 experienced disease progression during or after receiving a CDK4/6 inhibitor and hormone therapy. You must not have received more than 1 line of therapy or chemotherapy. 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, best dose, and effects (good and bad) of MEN2312, an experimental KAT6 inhibitor, alone or with elacestrant (Orserdu®) hormone therapy.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) hormone receptor positive (ER+ and/or PR+) breast cancer who have received a CDK4/6 inhibitor with hormone therapy for advanced disease. You must have received no more than 6 lines of therapy for advanced disease, including no more than 2 lines of chemotherapy and/or antibody drug conjugates (ADC). 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 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 study the safety, effects (good and bad), and anti-cancer activity of inavolisib (Itovebi®) PI3K inhibitor with palbociclib (Ibrance®) CDK4/6 inhibitor and letrozole (Femara®) aromatase 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 a PIK3CA mutation. You must have been diagnosed with de novo advanced/metastatic breast cancer or received at least 2 years of hormone therapy and completed hormone therapy at least 1 year before your advanced/metastatic diagnosis. You must have not yet received treatment for advanced disease. 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 the safety, effects (good and bad), and anti-cancer activity of BMS-986500, a CDK4/6 inhibitor.

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

Purpose: To compare the safety, effects (good and bad), and anti-cancer activity of Tersolisib (LY4064809), an experimental PI3Ka inhibitor, with standard of care CDK4/6 inhibitor and 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 breast cancer with a PIK3CA mutation. You may have received 0-2 prior treatments for advanced or metastatic breast cancer. View full eligibility criteria

Purpose: To study the safety, effects (good and bad), and anti-cancer activity of LY4257496 GRPR radiopharmaceutical with or without standard of care therapy.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) estrogen receptor positive (ER+) breast cancer. Your tumor must be positive for gastrin-releasing peptide receptor (GRPR). View full eligibility criteria

Purpose: To study the safety, effects (good and bad), and anti-cancer activity of LY4337713 radiopharmaceutical.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) breast cancer that is positive for fibroblast activation protein (FAP) who have received at least 1 line of therapy. View full eligibility criteria

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

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) HER2 positive (HER2+), HER2 low, or HER2 ultralow breast cancer. You must have received 1-3 prior lines of therapy for advanced disease. 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 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 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 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, 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 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, 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, 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 and effects (good and bad) of 7 different immunotherapy-based treatment combinations in people with triple negative (ER-/PR-/HER2-) breast cancer.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) triple negative (ER-/PR-/HER2-) breast cancer that progressed during or following first-line metastatic treatment with chemotherapy. 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 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 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 study the safety, effects (good and bad), and anti-cancer activity of GTAEXS617-001 CDK7 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 whose cancer has progressed while receiving palbociclib (Ibrance®), ribociclib (Kisqali®), or abemaciclib (Verzenio®). View full eligibility criteria

Purpose: To study the safety, side-effects, anti-cancer activity, and best dose of the antibody-drug conjugate SGN-B6A.

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 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

Purpose: To study the safety, effects (good and bad), and anti-cancer activity of AVZO-023 CDK4 inhibitor in combination with hormone therapy and an experimental CDK2 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. You must not have received CDK2, 4, and/or 6 inhibitors. You must not have active, untreated brain metastases. View full eligibility criteria

Purpose: To study the safety, best dose, and effects (good and bad) of XB010, an experimental antibody drug conjugate (ADC).

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) hormone receptor positive (ER+ and/or PR+) or 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 STAR0602, an experimental immunotherapy, with sacituzumab govitecan (Trodelvy®) 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, effects (good and bad), and anti-cancer activity of ECI830, an experimental; CDK2 inhibitor, with ribociclib (Kisqali®) CDK4/6 inhibitor and fulvestrant (Faslodex®) 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 an aromatase inhibitor or tamoxifen (Nolvadex®) with a CDK4/6 inhibitor. You must not have received more than 2 lines of hormone therapy. 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 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 NT-175, an experimental T cell receptor (TCR) immunotherapy.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) HLA positive breast cancer with the TP53 R175H mutation who have received at least 1 line of therapy. View full eligibility criteria

Purpose: To study the safety, best dose, effects (good and bad), and anti-cancer activity of PC14586, an experimental p53 reactivator, alone or with pembrolizumab (Keytruda®) PD-1 inhibitor.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) breast cancer with a TP53 Y220C mutation who have received at least 1 line of therapy. View full eligibility criteria

Purpose: To study the safety, effects (good and bad), and anti-cancer activity of gedatolisib, an experimental targeted therapy, with standard of care CDK4/6 inhibitor and hormone therapy compared to standard of care alone.

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 were diagnosed with advanced disease during or within 1 year of completing hormone therapy. You must have not yet received treatment for advanced disease. View full eligibility criteria

Purpose: To study the safety, side effects (good and bad), and anti-cancer activity of a targeted therapy called RGT‑490.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) hormone receptor‑positive (ER+ and/or PR+), HER2‑negative breast cancer that has a PIK3CA gene mutation and has progressed after at least one prior line of treatment. View full eligibility criteria

Purpose: To determine the safety and best dose of CX-5461, an experimental targeted therapy.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) breast cancer who have a BRCA2 or PALB2 germline (genetic) mutation. View full eligibility criteria

Purpose: To study the safety, effects (good and bad), and anti-cancer activity of BBI-940, a new type of targeted treatment, alone or in combination with 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 or triple negative (ER-, PR-, HER2-) breast cancer that is also androgen receptor positive (AR+). You must have already received standard treatment. View full eligibility criteria

Purpose: To study the safety, effects (good and bad), and anti-cancer activity of AMXT 1501 and DFMO when combined with standard treatments.

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 alterations in the genes, PIK3CA, AKT1, or PTEN, whose cancer has progressed on at least 2 hormone therapies. View full eligibility criteria

Purpose: To study the safety, effects (good and bad), and anti-cancer activity of a targeted therapy, PIKTOR (Sapanisertib and Serabelisib), 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. You must have received at least one prior line of chemotherapy. View full eligibility criteria

Purpose: To study the safety, best dose, and effects (good and bad) of LY4052031, 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, best dose, effects (good and bad), and anti-cancer activity of BL-B01D1, an experimental antibody drug conjugate.

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

Purpose: To study the safety, best dose, effects (good and bad), and anti-cancer activity of RGT-419B, an experimental type of targeted therapy called a CDK 2/4/6 inhibitor, alone and 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-) breast cancer that has progressed after treatment with a CDK 4/6 inhibitor and hormone therapy. You must not have received more than 1 line of chemotherapy. View full eligibility criteria

Purpose: To study the best dose, safety, and anti-cancer activity of AMXI-5001--an experimental PARP 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, best dose, and effects (good and bad), and anti-cancer activity of A2B395, an experimental CAR T cell immunotherapy.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) triple negative (ER-, PR-, HER2-) breast cancer that expresses EGFR (EGFR+) and has lost HLA-A*02 expression. View full eligibility criteria

Purpose: To study the safety, best dose, effects (good and bad), and anti-cancer activity of MGC026, an experimental antibody drug conjugate (ADC).

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) breast cancer who have not received trastuzumab deruxtecan (Enhertu®). View full eligibility criteria

Purpose: To study the safety, best dose, and effects (good and bad) of MBQ-167, an experimental targeted therapy.

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, best dose, and effects (good and bad) of STX-001, an experimental mRNA drug, with 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 who have received chemotherapy and pembrolizumab (Keytruda®) or dostarlimab (Jemperli®) for advanced disease. You must have at least 1 tumor that has not received radiation. View full eligibility criteria

Purpose: To study the safety, effects (good and bad), and anti-cancer activity of izalontamab brengitecan, a bi-specific antibody-drug conjugate (ADC), compared to standard chemotherapy.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) triple negative (ER-, PR-, HER2-) or estrogen receptor low (ER low) breast cancer who have not yet received treatment for their metastatic disease. You must be ineligible for anti-PD-1, anti-PD-L1, and hormone therapy. View full eligibility criteria

Purpose: To study the safety, best dose, effects (good and bad), and anti-cancer activity of INCB123667, an experimental type of targeted therapy called a CDK 2 inhibitor.

Who is this for?: For people with advanced (some stage III) or metastatic (stage IV) breast cancer that has progressed on standard treatment. If you have hormone receptor positive (ER+ and/or PR+) breast cancer, you must not have received treatment with a CDK 4/6 inhibitor. View full eligibility criteria

Purpose: To find a dose of zongertinib, an experimental targeted therapy, that people with advanced HER2+ breast cancer can tolerate best when taken with trastuzumab deruxtecan (T-DXd, Enhertu®) or trastuzumab emtansine (T-DM1, Kadcyla®) antibody drug conjugates.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) HER2 positive (HER2+) breast cancer. View full eligibility criteria

Purpose: To study the safety, best dose, effects (good and bad), and anti-cancer activity of ivermectin (Stromectol®), an experimental anti-cancer drug, with balstilimab, an experimental immunotherapy.

Who is this for?: People with metastatic (stage IV) triple negative (ER- or ER low, PR- or PR low, HER2-) breast cancer who have received 1-2 lines of chemotherapy or antibody-drug conjugate (ADC) for metastatic disease. You must not have received treatment with pembrolizumab (Keytruda®) or dostarlimab (Jemperli®) for metastatic disease. View full eligibility criteria

Purpose: To study the safety, best dose, and effects (good and bad) of SMP-3124LP, an experimental CHK1 inhibitor.

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 HER2 low) breast cancer 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 LCB84, an experimental antibody drug conjugate (ADC), with or without a PD-1 inhibitor.

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

Purpose: To study the safety, best dose, and effects (good and bad) of BL-M07D1, an experimental antibody drug conjugate (ADC).

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) HER2 positive (HER2+), HER2 low, or HER2 amplified breast cancer who have received at least 2 lines of therapy. You are also eligible if circulating tumor cells (CTCs) are HER2 amplified. View full eligibility criteria

Purpose: To study the safety, best dose, effects (good and bad), and anti-cancer activity of BNT323, an experimental antibody drug conjugate (ADC), and/or BNT327, an experimental immunotherapy.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) HER2 low, HER2 ultralow, and HER2 negative (HER2-) breast cancer. You must not have received treatment with trastuzumab deruxtecan (Enhertu®) or sacituzumab govitecan (Trodelvy®) ADCs or irinotecan (Camptosr®) chemotherapy. View full eligibility criteria

Purpose: To study the safety, best dose, effects (good and bad), and anti-cancer activity of elacestrant, an experimental hormone therapy, alone or with abemaciclib (Verzenio®) CDK 4/6 inhibitor.

Who is this for?: People with metastatic (stage IV) estrogen receptor positive (ER+), HER2 negative (HER2-) or HER2 low breast cancer that has spread to the brain (brain metastasis) who have received at least 1 hormone therapy, up to 2 chemotherapies, and up to 2 CDK 4/6 inhibitors for metastatic disease. View full eligibility criteria

Purpose: To study the safety, best dose, effects (good and bad), and anti-cancer activity of ZEN003694, an experimental BET bromodomain Inhibitor, with abemaciclib (Verzenio®) CDK4/6 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 patritumab deruxtecan antibody-drug conjugate (ADC) compared to chemotherapy or trastuzumab deruxtecan (T-DXd; Enhertu®) ADC.

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 whose cancer has progressed while receiving a CDK4/6 inhibitor and hormone therapy. You must not have a BRCA mutation and be eligible for treatment with a PARP inhibitor. View full eligibility criteria

Purpose: To study the safety, effects (good and bad), and anti-cancer activity of inavolisib (Itovebi®) PI3K inhibitor with fulvestrant (Faslodex®) hormone therapy.

Who is this for?: People with advanced (some stage III) or metastatic (stage IV) hormone receptor positive (ER+), HER2 negative (HER2-) breast cancer with a PIK3CA mutation whose disease progressed while taking anti-hormone therapy with a CDK 4/6 inhibitor. You must not have received more than 1 line of anti-hormone therapy with a CDK 4/6 inhibitors for advanced disease. View full eligibility criteria

Purpose: To study the safety, effects (good and bad), and anti-cancer activity of a different dose and schedule of sacituzumab govitecan (Trodelvy), an 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 not yet received treatment for advanced disease. Your tumors must be PD-L1 negative, or you must have received treatment with pembrolizumab (Keytruda) or atezolizumab (Tecentriq®) immunotherapy for early stage disease. You must not have received treatment with trastuzumab deruxtecan (Enhertu®) or sacituzumab govitecan (Trodelvy®) ADCs or irinotecan (Camptosar®) chemotherapy. View full eligibility criteria