Kumorixilib Plus Capecitabine and Letrozole for Neoadjuvant Treatment of HR-Positive HER2-Negativ… (NCT07691333) | Clinical Trial Compass
Not Yet RecruitingPhase 2
Kumorixilib Plus Capecitabine and Letrozole for Neoadjuvant Treatment of HR-Positive HER2-Negative Breast Cancer
China35 participantsStarted 2026-06-30
Plain-language summary
This study is a single-center, prospective, open-label exploratory clinical study to assess the efficacy and safety of kumorixilib combined with capecitabine and letrozole as neoadjuvant therapy in patients with HR+/HER2- stage II-III invasive breast cancer. The study plans to enroll 35 eligible patients, and all participants will receive the triple-drug combination regimen without randomization. The treatment regimen: kumorixilib 180 mg orally once daily, capecitabine 500 mg orally three times daily, and letrozole 2.5 mg orally once daily; each cycle lasts 28 days, for a total of 6 cycles. Breast MRI will be used to evaluate radiological tumor response. Surgical resection will be arranged 2-4 weeks after neoadjuvant treatment ends. The primary endpoint is the percentage change in Ki-67 score from baseline to Cycle 1 Day 28. Secondary endpoints include the complete cell cycle arrest rate (CCCA, Ki-67 ≤ 2.7%) on Day 28, the reduction rate of functional tumor volume (FTV), the proportion of patients with RCB 0-1, objective response rate (ORR), and treatment safety. Treatment will be discontinued upon disease progression, intolerable adverse events, withdrawal of consent, or investigator judgment.
Who can participate
Age range
18 Years – 75 Years
Sex
FEMALE
See this in plain English?
AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
Inclusion criteria
. Female patients with breast cancer aged ≥18 and ≤75 years, satisfying one of the following menopausal status criteria: (1) Bilateral oophorectomy in medical history, or age ≥60 years; (2) Age \<60 years with natural menopause (defined as spontaneous cessation of regular menses for at least 12 consecutive months without other pathological or physiological causes), with postmenopausal levels of E2 and FSH; (3) Pre-menopausal or peri-menopausal female patients who are willing to receive LHRH agonist therapy throughout the study period.
. Histopathologically confirmed estrogen receptor (ER)-positive (\>10%) and/or progesterone receptor (PR)-positive (\>10%), HER2-negative breast cancer, assessed in accordance with the 2018 ASCO-CAP guidelines. HER2 negativity is defined as immunohistochemistry (IHC) score of 0+, or IHC 2+ with negative in situ hybridization (ISH) test (ISH amplification ratio \<2.0), verified by the pathological laboratory.
. Accept core needle biopsy to provide initial tissue samples with Ki-67 ≥10% tested on the initial specimen; agree to provide tissue samples for tumor biomarker testing and peripheral blood samples for biomarker analysis.
Questions worth asking your doctor
Bring these to your next appointment. They're a starting point for a shared conversation — not a sign you qualify or a recommendation to enrol.
1Based on my diagnosis and history, is this trial worth exploring for me — or is there a standard treatment we should try first?
2What does this trial's phase tell us about how much is already known about its safety and benefit?
3What would taking part actually involve for me — visits, tests, time, and travel?
4What are the known and possible risks or side effects I should weigh, and how would they be monitored?
5If this trial isn't the right fit, what other options or trials would you suggest I look into?
Generated to help you prepare — always confirm anything about your own eligibility and care with the study team and your doctor.
Questions for the trial coordinator
The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.
1What does taking part actually involve week to week — how many visits, where, and how long does each one take?
2What costs are covered by the study, and what might I have to pay for myself, including travel, parking, or time off work?
3What happens during screening, and what happens if the study team confirms I don't meet the criteria after those tests?
4Who pays for the scans, blood work, and other tests the trial requires — the study, my insurance, or me?
5How will being in the trial affect my regular care, and will my own doctor stay informed and involved?
6Can I leave the trial at any point if I change my mind, and what would happen to my care if I do?
A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.
What they're measuring
1
Percentage change in Ki-67 score from baseline to Cycle 1 Day 28
Timeframe: At the end of Cycle 1 (each cycle is 28 days)
. Treatment-naïve breast cancer patients staged as Stage II-III per the 8th edition of the AJCC staging system.
. Eastern Cooperative Oncology Group (ECOG) performance status score of 0 or 1.
. Adequate organ function as defined below: Hematologic function: ① Absolute neutrophil count (ANC) ≥1.5×10⁹/L (no growth factor administered within 14 days prior to screening); ② Platelet count ≥100×10⁹/L (no corrective hematologic therapy within 7 days prior to screening); ③ Hemoglobin ≥100 g/L (no corrective hematologic therapy within 7 days prior to screening).
. Cardiac function on echocardiogram: left ventricular ejection fraction (LVEF) ≥50%. 12-lead electrocardiogram (ECG): QT interval ≤480 ms.
. Able to provide written informed consent prior to any study-related procedures.
Exclusion criteria
. Prior receipt of any form of anti-tumor therapy (including chemotherapy, radiotherapy, molecular targeted therapy, endocrine therapy, etc.).
. Concurrent administration of other anti-tumor agents.
. Bilateral breast cancer, inflammatory breast cancer, or occult breast cancer.
. Stage IV breast cancer.
. Breast cancer without histopathological confirmation, or refusal to undergo breast core needle biopsy before or during study treatment.
. History of other malignant tumors within the previous 5 years, except for cured carcinoma in situ of the cervix.
. Severe dysfunction of vital organs including the heart, liver and kidneys.
. Conditions interfering with oral drug intake and absorption, such as inability to swallow, chronic diarrhea, or intestinal obstruction.