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NCT Number: NCT07254858

Combined Chemo-immunotherapy Plus SBRT in Neoadjuvant Treatment for Luminal Subtype Breast Cancer

This study is a prospective, randomized controlled clinical trial designed to evaluate the efficacy and safety of combining radiotherapy, chemotherapy, and immunotherapy in the neoadjuvant treatment of high-risk HR+/HER2- breast cancer patients.

The study plans to enroll treatment-naïve HR+/HER2- breast cancer patients aged 18-75 with high-risk features (e.g., tumor size ≥3 cm or lymph node positivity, Ki-67 ≥20%). Eligible subjects will be randomized in a 1:1 ratio into two groups: the control group will receive neoadjuvant chemotherapy (nab-paclitaxel followed by epirubicin + cyclophosphamide) in combination with sintilimab immunotherapy; the experimental group will receive the same chemotherapy and immunotherapy regimen with the addition of stereotactic body radiotherapy (SBRT) administered early during treatment, at a prescribed dose of 8 Gy per fraction for 3 fractions, with one fraction per day.

The study has dual primary endpoints: pathological complete response (pCR,) and objective response rate (ORR ). Secondary endpoints include 3-year event-free survival (EFS), incidence of adverse events (CTCAE v5.0), and postoperative cosmetic outcomes of the breast. The study design incorporates hierarchical testing to control for multiplicity, and long-term follow-up is planned to evaluate survival benefits.

The study has been approved by the ethics committee, and all participants are required to provide written informed consent. The results are expected to offer a novel neoadjuvant treatment strategy for high-risk HR+/HER2- breast cancer patients and improve their therapeutic outcomes.

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Key information

Conditions

HR+/HER2- Breast Cancer Breast Diseases Breast Neoplasms Neoplasms Neoplasms by Site Skin Diseases Skin and Connective Tissue Diseases

Age range

18 year–75 year

Sex eligibility

Female

Study type

Interventional

Phase

Phase 2

Primary location

The First Affiliated Hospital of Wenzhou Medical University

Wenzhou, Zhejiang, China

Location contact

Professor Wang

CONTACT

[email protected]

86+13957706099

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Newly diagnosed, untreated breast cancer;
  • Age: 18 years ≤ age ≤ 75 years;
  • Histologically confirmed hormone receptor-positive (HR+) tumor specimen (estrogen receptor [ER] ≥ 10%);
  • Human epidermal growth factor receptor-2 immunohistochemistry (HER2-IHC) result of 0/1+ or 2+ with negative fluorescence in situ hybridization (FISH) test;
  • Histologically confirmed cell proliferation index (Ki67) ≥ 20%;
  • Programmed death-ligand 1 combined positive score (PD-L1 CPS) evaluable (i.e., availability of fresh/archived specimens);
  • Good pulmonary function;
  • Adequate hepatic and renal function;
  • Histological grade ≥ 2;
  • cN0, cT ≥ 3 cm or cN1-3, cT ≥ 2 cm (cT: clinically assessed maximum diameter of primary tumor; cN: clinically assessed regional lymph node status);
  • Eastern Cooperative Oncology Group Performance Status (ECOG score) 0-1. Exclusion Criteria:

1.Pregnancy; 2.Tumor > 8 cm with skin ulceration; 3.History of thoracic radiotherapy or contraindications to radiotherapy; 4.Active autoimmune disease; 5.Prior use of PD-L1 antibody therapy; 6.De novo breast cancer; 7.There are factors that may significantly increase the risk of lung or cardiac toxicity related to radiotherapy, such as (1) maximum lung depth(MLD) >3.2cm； (2) maximum heart distance(MHD) <2.4cm。

Treatment and study plan

Neoadjuvant radiotherapy

Radiation

Neoadjuvant Radiotherapy Regimen:

  • Radiotherapy Technique: Stereotactic Body Radiation Therapy (SBRT) Radiation Dose and Fractionation: 8 Gy per fraction, for a total of 3 fractions, amounting to a total dose of 24 Gy
  • Radiotherapy Schedule: Irradiation begins on the second day of the first chemotherapy cycle and is administered every other day
  • Target Volume Definition: The radiotherapy target volume is defined based on baseline imaging (e.g., CT, MRI, or PET-CT)
  • Radiotherapy Equipment and Planning: Treatment is delivered using a linear accelerator equipped with Image-Guided Radiotherapy (IGRT) technology to ensure precise irradiation and dose optimization

Neoadjuvant Chemotherapy (NACT)

Drug

Neoadjuvant Chemotherapy Regimen:

A sequential chemotherapy strategy is adopted, with the specific regimen as follows:

Taxane-based Chemotherapy Phase (T Phase):

Nab-paclitaxel (125 mg/m²), administered by intravenous infusion on Day 1 and Day 8 of each 21-day cycle (Q3W), for a total of 4 cycles.

Anthracycline-based Combination Chemotherapy Phase (EC Phase):

Epirubicin (75-100 mg/m²) in combination with cyclophosphamide (600 mg/m²), administered by intravenous infusion every 21 days (Q3W), for a total of 4 cycles.

The EC phase commences upon completion of the T phase.

Immunotherapy (Sintilimab)

Drug

Immunotherapy Regimen:

Sintilimab (200 mg), administered by intravenous infusion every three weeks (Q3W).

Dosing begins on Day 2 of the chemotherapy cycles, for a total of 8 treatment cycles.

Primary outcomes

  1. Pathological complete response rate（pCR）

    Time frame: Pathological diagnosis results were obtained tithin one month after the operation

    Postoperative pathological assessment (tumor Miller-Payne system grading and axillary lymph node pathological assessment)

Secondary outcomes

  1. Objective response rate(ORR)

    Time frame: At the end of Cycle 8 (each cycle is 28 days)

    The proportion of patients achieving complete response (CR) and partial response (PR) after tumor treatment was used as the second endpoint of the primary endpoint for hierarchical testing.

  2. Event-free survival rate

    Time frame: Long-term follow-up monitoring was conducted until 3 years after enrollment

    The time from randomization to the event (recurrence, metastasis or death)

  3. Incidence of adverse reactions

    Time frame: 1 year

    Continuous monitoring, assessment and patient feedback.

Other outcomes

  1. The breast-conserving rate of breast malignant tumor surgery

    Time frame: Perioperative/Periprocedural

    The breast-conserving rate of breast malignant tumor surgery

Sponsors and collaborators

Lead sponsor

First Affiliated Hospital of Wenzhou Medical University

Other

Registry information

Official study title

Combined Chemo-immunotherapy Plus SBRT in Neoadjuvant Treatment for Luminal Subtype Breast Cancer: A Prospective Multicenter Randomized Controlled Trial

Acronym: CISN-L

Important dates

Study start
2025
Primary completion
2026
Study completion
2029
First posted
Nov 28, 2025
Registry last updated
Nov 28, 2025

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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