The Efficacy and Safety of Dalpiciclib Plus Endocrine Therapy in HR-positive / HER2-negative Advanced Breast Cancer Patients With Visceral Crisis

Official title

An Exploratory Trial of Dalpiciclib in Combination With Endocrine Therapy in HR-positive / HER2-negative Advanced Breast Cancer Patients With Visceral Crisis

Overview

This is a multicenter, single-arm, open-label, Simon's two-stage exploratory clinical trial. 18 eligible patients with advanced breast cancer with visceral crisis will enroll in stage I. If the study enter stage 2 and continue to include 53 assessable subjects (35 in stage 2). All eligible patients will receive Dalpiciclib plus endocrine therapy chosen by the Physicians until disease progression, death or intolerable toxicity. Tumor assessment was conducted according to RECIST 1.1 criteria.

Interventions

• Drug Dalpiciclib in combination with endocrine therapy by Physicians choice
  Dalpiciclib 150 mg orally once daily for 3 weeks, followed by 1 week off in each 4-week cycle. Endocrine therapy including but not limited to fulvestran, tanastrozole, letrozole or exemestane In regular doses

Primary outcome measures

• 6-month-OS rate [Time frame: From the start of treatment to 6 month]

Secondary outcome measures (9)

• Overall Survival (OS) [Time frame: From the start of treatment to 36 month]
• 1-year-OS rate [Time frame: From the start of treatment to 12 month]
• Progression-Free Survival (PFS) [Time frame: From the start of treatment to 36 month]
• Time to treatment failure (TTF) [Time frame: From the start of treatment to 36 month]
• Objective Overall Response Rate (ORR) [Time frame: From the start of treatment to 36 month]
• Clinical Benefit Response (CBR) [Time frame: From the start of treatment to 36 month]
• Duration of Response (DoR) [Time frame: From the start of treatment to 36 month]
• Time to response（TTR） [Time frame: From the start of treatment to 36 month]
• Adverse events (AEs) [Time frame: From the start of treatment to 36 month]

Eligibility criteria

Inclusion criteria

• Postmenopausal or premenopausal/perimenopausal women aged ≥18 meet one of the following:

A) Previous bilateral oophorectomy, or age ≥60 years; or B) age<60. Natural postmenopausal status (defined as spontaneous cessation of regular menstruation for at least 12 consecutive months without other pathological or physiological causes), E2 and FSH at postmenopausal levels; or C) premenopausal/perimenopausal women must receive LHRH agonists therapy during the study.

• Female breast cancer patients diagnosed as HR-positive or HER2-negative by pathological examination are not suitable for surgical resection or radiotherapy for the purpose of cure.

A) ER-positive and/or PR-positive are defined as: ≥ 1% of all tumor cells are positively stained (confirmed by investigator review at the site); B) HER2-negative are defined as: 0/1 + by standard immunohistochemistry (IHC); HER2/CEP17 ratio less than 2.0 by ISH or HER2 gene copy number less than 4 (confirmed by investigator review at the site).

• Any clinical signs or symptoms of symptomatic brain metastasis or visceral metastasis (at least one of the following: carcinomatous meningitis or leptomeningeal metastasis; pleural effusion; ascites; abdominal pain caused by liver or peritoneal metastasis; dyspnea caused by pleural effusion or pulmonary lymphangitis; elevated liver enzymes (> 2 × ULN); rapid elevation of bilirubin > 1.5 × ULN in the absence of Gilbert's syndrome or biliary obstruction; pathologically confirmed bone marrow metastasis; hemoglobin less than 10 g) and patients who cannot tolerate chemotherapy or are considered by the investigator to be inappropriate for chemotherapy or chemotherapy.
• Adequate bone marrow function. Definitions are as follows: a) neutrophil count (ANC) ≥ 1,500/mm3 (1.5 x 109L) (14 without growth factors); b) platelet count (PLT) ≥ 100,000/mm3 (100 x 109L) (7 without correction); c) hemoglobin (Hb) ≥ 8 g/dL (80 g/L) (7 without correction).
• Female subjects who are not postmenopausal or surgically sterile must have a serum pregnancy test within 7 days before the first dose and have a negative result, and are willing to abstain from sexual intercourse or use a medically recognized highly effective contraceptive measure after signing the informed consent, during the study, and for 1 year after administration of the study drug.
• Voluntarily participate in this study, sign informed consent, have good compliance and are willing to cooperate with follow-up.

Exclusion criteria

• Patients contraindicated with dalpiciclib.
• Patients with primary resistance to endocrine therapy. Relapse within 2 years of adjuvant endocrine therapy, or disease progression within 6 months of advanced first-line endocrine therapy.
• Patients with more than 3 lines of prior endocrine therapy.
• Patients previously treated with any CDK4/6 inhibitor.
• Patients with simple bone metastasis.
• Human immunodeficiency virus (HIV) infection or known acquired immunodeficiency syndrome (AIDS), active hepatitis B (HBV DNA ≥ 1000 IU/ml), hepatitis C (hepatitis C antibody positive, and HCV-RNA above the lower limit of detection of the analytical method) or combined hepatitis B and C co-infection.
• Within 6 months before enrollment, the following conditions occur: myocardial infarction, severe/unstable angina pectoris, NYHA grade 2 or higher cardiac insufficiency, ≥ grade 2 persistent arrhythmia (according to NCI CTCAE v5.0), atrial fibrillation of any grade, coronary/peripheral artery bypass grafting, symptomatic congestive heart failure, cerebrovascular accident (including transient ischemic attack) or symptomatic pulmonary embolism.
• Severe infection occurring within 4 weeks (such as intravenous drip of antibiotics, antifungal or antiviral drugs according to clinical practice) before the first dose, or unexplained fever > 38.5℃ during screening/before the first dose.
• Inability to swallow, intestinal obstruction, or other factors affecting drug administration and absorption.
• Known hypersensitivity to dalpiciclib and any of its excipients.
• Known history of allogeneic organ transplantation or allogeneic hematopoietic stem cell transplantation;
• Known history of psychiatric drug abuse or drug use;
• Female patients who are pregnant or lactating.
• Any other condition that the investigator considers the subject unsuitable for this study.

Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.

Healthy volunteers: No

Study design

Allocation

N/A

Model

Single group

Masking

Open label

Primary purpose

Treatment

Study locations

China · 1 center

• Cancer Hospital, Chinese Academy of Medical Sciences — Beijing

Publications

• Mo H, Teng Y, Cai L, Li H, Wu X, Yao J, Wang Y, Lv D, Peng X, Wang S, Chen R, Yi X, Shang Q, He Y, Liu J, Pang Z, Feng T, Ma F. Dalpiciclib plus endocrine therapy in women with HR+/HER2- advanced breast cancer and visceral crisis: a multicenter, nonrandomized, phase 2 DARVIN trial. Nat Cancer. 2026 Jul 21. doi: 10.1038/s43018-026-01208-0. Online ahead of print. PMID 42481711

Identifiers

NCT: NCT05431504 · MA-BC-II-033

Primary sources (government registries)

• ClinicalTrials.gov (US NIH)

View this study on ClinicalTrials.gov ↗