Precision Medicine in Action: Phase II Trial of Response Adaptive Ablative Pre-operative SPBI (RAPS) and Non-operative Sentinel Lymph Node Biopsy in Patients With Early-stage ER+ Breast Cancer: RAPS Trial

NCT06444269 | Recruiting Phase 2 DMC FDA Device

• 1 other identifier: STU-2024-0561
• Study Type: interventional
• Target: 53
• Locations: 1 country
• Sites: 1

Brief Summary

1\. Efficacy of PULSAR preoperative radiation 2. Evaluate potential of microbubble CEUS as an alternative to operative SLNBx 3. Evaluate potential of OA to evaluate treatment response of pre-operative radiation on the tumor

Conditions

Breast Cancer

Outcome Measures

Primary Outcomes (1)

• Single fraction pre-operative radiation

  To determine efficacy of single fraction 30 Gy pre-operative radiation in early-stage ER+ breast cancer patients and determine pathologic complete response rate at 10-15 months after radiation. Patients that have not had a complete imaging response on MRI, OA, or on needle biopsy at 9 months will move onto a second fraction of PULSAR radiation of 8 Gy at 9-10 months. Surgery will be at 10-12 months for those with complete imaging response and negative needle biopsy. For those with residual disease surgery will be postponed to 12-15 months.

  4 years

Secondary Outcomes (1)

• Microbubble contrast

  4 years

Interventions

Radiomics on MRI RADIATION

Through extracting and analyzing a large number of features from medical imaging, radiomics has shown promising results in treatment outcome prediction for many diseases including breast cancer (45-50). UTSW physics group has developed several new radiomic approaches and radiomic features, such as a multi-objective radiomics model(51) and a new radiomic "Shell" feature(52). As an exploratory end point for this trial, the investigators will explore the application radiomics using pre-treatment MRI, treatment parameters and clinical characteristics as input to predict pathological response of radiation therapy (XRT) based on pathology report of surgical tissues and local recurrence.

microbubble CEUS Contrast Enhanced Ultrasound (CEUS) DRUG

Microbubble Contrast non-FDA approved for route of administration

Eligibility Criteria

• Age: 18 Years+
• Gender Eligibility Details: Female only study
• Healthy Volunteers: No
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• \. Invasive epithelial (ductal, medullary, lobular, papillary, mucinous (colloid), or tubular) histologies of the breast 3 cm or less(T1-T2cN0) in women who have not undergone surgery or neoadjuvant endocrine or chemotherapy for current breast cancer diagnosis. For cohort 1, it is highly recommended those tumors are at least 1 cm.
• \. Tumor must not involve the overlying skin based on imaging evaluation and/or clinical exam 3. Age \>/= 18 years old and female 4. Greatest Tumor dimension is 3cm or less based on US. MRI measurements can be included only if performed BEFORE the biopsy 5. Tumor must be unifocal 6. The tumor must be visible on CT scan and/or preferably marked with clip(s) in tumor if not visible. At least one clip should be placed in or around tumor prior to enrollment 7. Patients must undergo an MRI for work up to aid in tumor delineation and to rule out additional foci of disease. If additional foci of disease are present, they need to have a negative biopsy to proceed with treatment.
• \. Clinically and radiographically node negative on ultrasound of the axilla or MRI on on initial workup prior to microbubble contrast assessment 9. Estrogen receptor positive or Progesterone receptor positive and Her2neu negative 10. Ability to understand and the willingness to sign a written informed consent.
• \. Women of child-bearing potential must agree to use adequate contraception (hormonal or barrier method of birth control) prior to the start of study and for the duration of radiation therapy. Should a woman become pregnant or suspect she is pregnant while participating in this study, she should inform her treating physician immediately
• A female of child-bearing potential is any woman (regardless of sexual orientation, having undergone a tubal ligation, or remaining celibate by choice) who meets the following criteria:
• Has not undergone a hysterectomy or bilateral oophorectomy; or
• Has not been naturally postmenopausal for at least 12 consecutive months (i.e., has had menses at any time in the preceding 12 consecutive months
• \. If patient has had a prior biopsy clip placed in the lymph node deemed the sentinel lymph node at time of microbubble CEUS, it is up to investigator if additional biopsy and clip placement will be obtained.

You may not qualify if:

• \- 1. Multi-centric disease 2. Prior Radiation to the involved breast 3. Tumor Size \>3cm 4. Patients who are pregnant or lactating due to the potential exposure to the fetus to radiation therapy and unknown effects of radiation therapy to lactating females 5. Prior ipsilateral breast cancer 6. Patients with active lupus or scleroderma 7. History of allergic reactions attributed to compounds of similar chemical or biologic composition to Gadolinium or other agents used in study.
• \. If patient has a positive lymph node at time of microbubble contrast enhanced ultrasound, they will be removed from the study. Only N0 patients to be treated on this study.

Sponsors & Collaborators

• University of Texas Southwestern Medical Center: lead

Study Sites (1)

UT Southwestern Medical Center-Dallas

Dallas, Texas, 75390, United States

RECRUITING

MeSH Terms

Conditions

Breast Neoplasms

Condition Hierarchy (Ancestors)

Neoplasms by Site; Neoplasms; Breast Diseases; Skin Diseases; Skin and Connective Tissue Diseases

Study Officials

• Asal Rahimi, MD

  University of Texas Southwestern Medical Center

  PRINCIPAL INVESTIGATOR

Central Study Contacts

Sarah Neufeld, MS

CONTACT

214-645-8525; sarah.hardee@utsouthwestern.edu

Basak Dogan, MD

CONTACT

214/645-3290; Dogan.Basak@utsouthwestern.edu

Study Design

• Study Type: interventional
• Phase: phase 2
• Allocation: NA
• Masking: NONE
• Purpose: TREATMENT
• Intervention Model: SINGLE GROUP
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Associate Professor

Study Record Dates

• First Submitted: May 30, 2024
• First Posted: June 5, 2024
• Study Start: October 11, 2024
• Primary Completion (Estimated): July 1, 2027
• Study Completion (Estimated): July 1, 2028
• Last Updated: November 5, 2025

Record last verified: 2025-11

Data Sharing

• IPD Sharing: Will not share

Locations

US (1)