SBRT, Chemotherapy, and AK104 Neoadjuvant Therapy for Triple-negative Breast Cancer (TNBC)

A Single-arm, Open, Phase II Clinical Study of SBRT, Chemotherapy, and Cadonilimab (AK104) Neoadjuvant Therapy for Triple-negative Breast Cancer (TNBC)

SBRT, Chemotherapy, and AK104 Neoadjuvant Therapy for Triple-negative Breast Cancer (TNBC) (NCT06401005) is a Phase 2 interventional studying Breast Cancer, sponsored by Hubei Cancer Hospital. RECRUITING as of the most recent ClinicalTrials.gov update. Talk to your doctor before contacting the trial site.

About This Trial

Studies have indicated that the improvement in pathological complete response (pCR) is significantly correlated with triple-negative breast cancer（TNBC）patients' overall survival (OS). Patients with TNBC have poor efficacy for neoadjuvant chemotherapy. The combination of neoadjuvant therapy with immunotherapy and chemotherapy has been demonstrated to enhance the pCR rate of TNBC patients, increasing it from 45% to approximately 60%. Therefore, how to further improve the pCR rate of TNBC breast cancer became the main objective of this study. Stereotactic radiotherapy (SBRT) not only kills tumor cells directly, but also kills the distant unirradiated tumor cells by promoting the cross-initiation of tumor-specific CD8+ T cells, a phenomenon known as the abscopal effect. Our research team has recently discovered that the triple therapy model of SBRT + anti-vascular targeting + anti-PD-1 was safe and efficacious in lung cancer patients. Cadonilimab (AK104) is an PD-1/CTLA-4 bispecific antibody. In order to improve the pCR, a single-arm, open, phase II clinical study was proposed to explore the safety and efficacy of SBRT+AK104+chemotherapy, a neoadjuvant treatment modality, in the treatment of TNBC.

What Stage of Research Is This?

Phase 2 trials evaluate whether a treatment actually works against Breast Cancer and continue monitoring side effects. Phase 2 enrolls larger groups (typically 100–300 patients) and produces the first real efficacy signal. A successful Phase 2 readout is what unlocks the much larger Phase 3 confirmatory trials needed for FDA approval.

This trial is currently recruiting participants. The sponsor has registered the study with ClinicalTrials.gov as actively enrolling, which means new applicants who meet the eligibility criteria can be considered for screening. Trial status can change between updates — confirm current recruiting status with the study contact before traveling for a screening visit.

Target enrollment of 51 participants puts this in the typical range for a Phase 2-style efficacy study or a moderate Phase 3 trial in a focused Breast Cancer subpopulation. At this scale, the study has enough statistical power to detect a clear treatment effect but is not the largest cohort in the field.

Who May Be Eligible (Plain English)

Who May Qualify: 1. diagnosed by tissue sample (biopsy-confirmed) ER-/PR-/HER2- invasive breast cancer patients (ER/PR immunohistochemistry negative or\<1%; Her2 immunohistochemistry of 0, 1+, or 2+/FISH-) patients; patients meeting one of the following conditions: (1) tumor mass larger than 2cm, (2) the presence of axillary lymph node metastasis, and (3) the desire to conserve breasts, but the ratio of tumor size to breast volume is large and difficult to conserve breasts; 2. Patients aged ≥18 years old; 3. ECOG score of 0-1; 4. Biochemical test indexes before enrollment must meet the following criteria, hematologic: white blood cell count (WBC) ≥ 2.0x10\^9/L; neutrophil count (ANC) ≥ 1.5×10\^9/L; platelet count (PLT) ≥ 100×10\^9/L; hemoglobin (Hb) ≥ 90g/L; function: total bilirubin (TBIL) ≤1.5 × upper limit of normal (ULN); glutamate aminotransferase (ALT) ≤3 × ULN; aspartate aminotransferase (AST) ≤3 × ULN; renal function: creatinine (Cr) ≤1.5 × ULN; if \>1.5 × ULN, creatinine clearance needs to be ≥50mL/min (calculated according to Cockcroft-Gault formula); coagulation: activated partial thromboplastin time (APTT) ≤ 1.5 × ULN; prothrombin time (PT) or international normalized ratio (INR) ≤ 1.5 × ULN. Who Should NOT Join This Trial: 1. Received chemotherapy, targeted therapy, or radiation therapy within 12 months prior to first use of study drug; 2. Solid organ or blood system transplantation; 3. Myocardial infarction, poorly controlled arrhythmia (including QTc intervals ≥ 470 ms) within 6 months prior to first use of study drug (QTc intervals are calculated using the Fridericia formula, which is: QTc=QT/RR \^0.33); 4. Class III-IV cardiac insufficiency according to NYHA criteria or cardiac ultrasound: LVEF \< 50%; 5. poorly controlled hypertension (defined as systolic blood pressure ≥ 150 mmHg and/or diastolic blood pressure ≥ 100 mmHg), previous hypertensive crisis or hypertensive encephalopathy; ...See full criteria on ClinicalTrials.gov Always talk to your doctor about whether this trial is right for you.

These are translations of the protocol\'s inclusion and exclusion criteria, simplified for patients and caregivers. The original clinical text appears below. Eligibility is ultimately confirmed by the trial site\'s screening process — this summary is a starting point for a conversation with your doctor, not a final determination.

Original Eligibility Criteria

View original clinical language

Inclusion Criteria: 1. Histologically confirmed ER-/PR-/HER2- invasive breast cancer patients (ER/PR immunohistochemistry negative or\<1%; Her2 immunohistochemistry of 0, 1+, or 2+/FISH-) patients; patients meeting one of the following conditions: (1) tumor mass larger than 2cm, (2) the presence of axillary lymph node metastasis, and (3) the desire to conserve breasts, but the ratio of tumor size to breast volume is large and difficult to conserve breasts; 2. Patients aged ≥18 years old; 3. ECOG score of 0-1; 4. Biochemical test indexes before enrollment must meet the following criteria, hematologic: white blood cell count (WBC) ≥ 2.0x10\^9/L; neutrophil count (ANC) ≥ 1.5×10\^9/L; platelet count (PLT) ≥ 100×10\^9/L; hemoglobin (Hb) ≥ 90g/L; function: total bilirubin (TBIL) ≤1.5 × upper limit of normal (ULN); glutamate aminotransferase (ALT) ≤3 × ULN; aspartate aminotransferase (AST) ≤3 × ULN; renal function: creatinine (Cr) ≤1.5 × ULN; if \>1.5 × ULN, creatinine clearance needs to be ≥50mL/min (calculated according to Cockcroft-Gault formula); coagulation: activated partial thromboplastin time (APTT) ≤ 1.5 × ULN; prothrombin time (PT) or international normalized ratio (INR) ≤ 1.5 × ULN. Exclusion Criteria: 1. Received chemotherapy, targeted therapy, or radiation therapy within 12 months prior to first use of study drug; 2. Solid organ or blood system transplantation; 3. Myocardial infarction, poorly controlled arrhythmia (including QTc intervals ≥ 470 ms) within 6 months prior to first use of study drug (QTc intervals are calculated using the Fridericia formula, which is: QTc=QT/RR \^0.33); 4. Class III-IV cardiac insufficiency according to NYHA criteria or cardiac ultrasound: LVEF \< 50%; 5. poorly controlled hypertension (defined as systolic blood pressure ≥ 150 mmHg and/or diastolic blood pressure ≥ 100 mmHg), previous hypertensive crisis or hypertensive encephalopathy; 6. Human immunodeficiency virus (HIV) infection, HIV-positive; active tuberculosis; previous and current subjects with interstitial pneumonia, pneumoconiosis, radiation pneumonitis, drug-associated pneumonitis, and severely impaired lung function that may interfere with the detection and management of suspected drug-associated pulmonary toxicity; 7. Known active or suspected autoimmune disease; 8. Subjects who are allowed to enroll in a stable state and do not require systemic immunosuppressive therapy; 9. Who have received a live vaccine within 28 days prior to the first use of study drug; however, inactivated viral vaccines for seasonal influenza are allowed; 10. Who require systemic treatment with corticosteroids (\> 10 mg/day prednisone equivalent dose) or other immunosuppressive medications within 14 days prior to the first use of study drug or for the duration of the study. Subjects. However, enrollment will be permitted in the absence of active autoimmune disease if the subject is treated with topical or inhaled steroids (low potency), systemic short-term use in small doses, single paracortical/intra-articular injections, or adrenocorticotropic hormone replacement therapy at a dose of ≤ 10 mg/day prednisone equivalent; and if any active infections that require systemic administration of Active infection requiring systemic administration of anti-infective therapy; subjects receiving prophylactic antibiotic therapy (e.g., for prevention of urinary tract infections or chronic obstructive pulmonary disease) are eligible for enrollment; 11. Hepatitis B (those with a positive Hepatitis B Surface Antigen \[HBsAg\] or Hepatitis B Core Antibody \[HBcAb\] test and positive Hepatitis B Virus Deoxyribonucleic Acid \[HBV-DNA\] test), Hepatitis C (those with a positive Hepatitis C Virus \[HCV\] antibody test and positive Hepatitis C Virus \[HBV\] antibody test), and Hepatitis C (those with a positive Hepatitis B virus \[HCV\] antibody test and positive Hepatitis C Virus \[HCV\] antibody test) antibody test positive and hepatitis C virus ribonucleic acid \[HCV-RNA\] test positive); subjects with hepatitis B and hepatitis C co-infection (positive HBsAg or HBcAb test and positive HCV antibody test); 12. Who have received other antibodies/drugs targeting immune checkpoints in the past, such as anti-PD-1, anti-PD-L1, anti-cytotoxic T-lymphocyte associated antigen- 4 (CTLA-4), and anti-cytotoxic T-lymphocyte associated antigen- 4 (CTLA-4). 4 (CTLA-4), etc.; are participating in another clinical study or are planning to start this study treatment less than 14 days from the end of treatment in the previous clinical study; 13. Have undergone major surgery within 4 weeks prior to the first dose of study drug. Definition of major surgery for this study: surgery that requires at least 3 weeks of postoperative recovery time before receiving treatment on this study. Tumor puncture or lymph node excision biopsy allowed for enrollment; 14. Pregnant or lactating females with a known history of severe allergy to any monoclonal antibody or the study drug and its excipients; 15. Known history of psychotropic substance abuse or drug use; discontinued use of alcohol allowed for enrollment; 16. Subjects with other factors that, in the judgment of the investigator, make them unsuitable for participation in this study.

Treatments Being Tested

DRUG

Cadonilimab (AK104)

8Gy\*3 SBRT to irradiate the primary lesion (without axillary lymph node metastasis) or 6Gy\*3 SBRT irradiation to irradiate the primary lesion and axillary lymph node metastasis will be administered at first. And then the first cycle of chemotherapy+AK104 given within 24 hours of the end of SBRT. The total eight cycles of preoperative chemotherapy combined with immunotherapy were administered. Surgical resection was performed within 4-6 weeks after the completion of the eighth cycle of chemotherapy combined with immunotherapy. The chemotherapy regimen consisted of: Four cycles of doxorubicin 50mg/m2 (Q3W) + cyclophosphamide 600mg/m2 (Q3W) were administered, followed by four cycles of sequential albumin paclitaxel (125 mg/m2, d1, d8) and carboplatin (AUC=6, d1, Q3W) for 4 cycles. Postoperative completion of 9 cycles of immunotherapy was continued ± the need for postoperative adjuvant radiotherapy was confirmed based on the patient's preoperative status.

Locations (1)

Trial sites listed on ClinicalTrials.gov for this study. Site activation status can vary — confirm with the specific site before traveling for a screening visit.

Hubei Cancer Hospital

Wuhan, Hubei, China

How to Talk to Your Doctor About This Trial

Bring the printable summary of this trial — including the NCT ID (NCT06401005), the sponsor (Hubei Cancer Hospital), and the key eligibility criteria — to your next appointment. Your doctor can review the inclusion and exclusion criteria against your medical history, lab values, and current treatments to assess whether you are likely to qualify. They can also help you weigh whether trial participation makes sense alongside your existing care plan.

Useful questions to walk through together: What does the trial protocol require beyond standard care? How long is the active treatment phase, and how long is follow-up? Are there study visits at sites I can reach? Who pays for the trial-specific procedures, and who pays for standard-of-care portions? See our 25 questions to ask about clinical trials guide for a more complete checklist.

Authoritative Sources

The official record for this trial lives on ClinicalTrials.gov — the federal registry maintained by the National Library of Medicine at NIH. For background on how this trial fits into the FDA approval pathway, see the FDA drug approval process. For oncology-specific guidance for patients considering trials, the National Cancer Institute publishes patient-oriented overviews. International trial registries are aggregated by the WHO ICTRP.

Frequently Asked Questions

What is the NCT06401005 clinical trial studying?

Who can participate in NCT06401005?

Eligibility for this trial depends on the specific inclusion and exclusion criteria set by the sponsor. The plain-English summary above translates the most important criteria into accessible language; the official clinical text is preserved in the collapsible section underneath. Whether you fit any specific trial is a medical decision your doctor needs to confirm — bring the trial information to your treating physician for a full review against your medical history.

How do I contact the trial site for NCT06401005?

Contact information registered with ClinicalTrials.gov is shown in the sidebar of this page. Before reaching out, confirm with your treating physician that this trial is appropriate for your situation. The trial site will then walk you through the screening process to determine final eligibility.

Is participating in a clinical trial safe?

Clinical trials in the United States are regulated by the FDA and overseen by Institutional Review Boards (IRBs) that review the protocol for safety. Risk varies by trial — Phase 1 studies test new treatments in humans for the first time, while Phase 3 trials use treatments that have already passed earlier safety screening. The informed consent document for any specific trial details the known risks and what to expect. Discuss those risks with your physician before deciding whether to participate.

Where can I verify the data on this page?

Every detail on this page comes directly from the ClinicalTrials.gov API. Click "View on ClinicalTrials.gov" in the sidebar to see the official, unmodified record. The federal record is always authoritative; this page is a structured presentation with a plain-English eligibility translation. For background on how clinical trials are regulated, see the FDA drug approval process documentation.

How This Page Is Built

Every field on this page is pulled directly from the ClinicalTrials.gov API v2 — no estimates, no proxies. The plain-English eligibility translation is generated from the original protocol text and reviewed for fidelity to the underlying clinical criteria. The original clinical text remains visible in the collapsible section above so users and clinicians can verify the translation. Read the full methodology for the data pipeline and known limitations.

Source: ClinicalTrials.gov API v2 record for NCT06401005. Maintained by the National Library of Medicine at NIH. Public domain. Cite as: "TrialFinderData. NCT06401005. Data: ClinicalTrials.gov."

Medical disclaimer: This page is informational, not medical advice. Talk to your doctor about whether a clinical trial is right for you.

Last updated 2026-05-08 · Data from ClinicalTrials.gov.