BreastVAX: Radiation Boost to Enhance Immune Checkpoint Blockade Therapy

NCT04454528 | Active Not Recruiting Phase 1 DMC FDA Drug

• 1 other identifier: UPCC 04119
• Study Type: interventional
• Target: 27
• Locations: 1 country
• Sites: 1

Brief Summary

The primary objective is to determine the feasibility of combining pembrolizumab with a single fraction radiation boost in patients with early/ operable breast cancer. The secondary objectives are to assess clinical response on pre- and post-treatment clinical, imaging, and histology exams, and to assess immune response on pre and post treatment blood and tissue samples by tracking change in Ki67 + CD8 T cells in peripheral blood and in extent of tumor infiltrating lymphocytes. A clinically significant partial response is defined as \>30% tumor shrinkage post-clinical trial intervention.

Conditions

Breast Cancer

Keywords

Immune checkpoint blockade

Outcome Measures

Primary Outcomes (2)

• Feasibility of preoperative pembrolizumab administration combined with radiation boost in patients with operable breast cancer

  Feasibility is defined as patient tolerability of the investigational treatment and no excessive delay in surgery in our participants. The interval to breast-conserving surgery and mastectomy was based on review of our records in patients undergoing breast cancer surgery in 2016. The average time to breast conservation surgery is 24.3 days (80% between 9 and 51 days) and for mastectomy with reconstruction 41.6 days (80% between 10 and 67 days).

  2 years

• Assess clinical response of treatment

  Evaluate clinical response using the following assessments: 1. Clinical breast exam 2. Breast ultrasonography (US) imaging (optional) for tumor dimension changes. 3. Histology (pathology) exams. Pathologic response is assess histologically on post-treatment tumor tissues. A major pathologic response will be defined as \<10% viable invasive tumor in treated. A clinically significant partial response is defined as \>30% tumor shrinkage post-clinical trial intervention.

  2 years

Secondary Outcomes (1)

• Assess immune response on pre- and post-treatment blood and tissue samples

  2 years

Study Arms (3)

Arm 1

ACTIVE COMPARATOR

Arm 1 will receive radiotherapy on day -14 and pembrolizumab on day -7. Subjects in all arms will undergo surgery on day 0 and follow the same postoperative blood sampling and safety schedule.

Radiation: Hypofractionated radiotherapy; Drug: Pembrolizumab infusion; Procedure: Blood and tissue sampling

Arm 2

ACTIVE COMPARATOR

Arm 2 will receive pembrolizumab on day -14 and radiotherapy on day -7. Subjects in all arms will undergo surgery on day 0 and follow the same postoperative blood sampling and safety schedule.

Radiation: Hypofractionated radiotherapy; Drug: Pembrolizumab infusion; Procedure: Blood and tissue sampling

Arm 4 (Historical Controls)

OTHER

Arm 4 will not receive any study treatment. Subjects will undergo surgery on day 0 and follow a preoperative (Day 0) and postoperative blood (Day 30) and tissue (Day 0) sampling schedule.

Procedure: Blood and tissue sampling

Interventions

Hypofractionated radiotherapy RADIATION

Radiation boost (RT) 7 Gy x 1 fraction on Day -14/Day -7 (arm 1) or Day -7/Day -14

Also known as: Radiation therapy

Arm 1; Arm 2

Pembrolizumab infusion DRUG

Pembrolizumab infusion flat dosing 200 mg delivered over 30 minutes.

Also known as: Checkpoint blockade administration

Arm 1; Arm 2

Blood and tissue sampling PROCEDURE

Blood will be collected for laboratory studies and complete correlative studies to examine how the subject's immune system is responding to treatment. On day 0, samples of tumor and any lymph nodes removed from armpit will be analyzed by the UPenn Department of Pathology according to standard practice.

Also known as: Correlative studies

Arm 1; Arm 2; Arm 4 (Historical Controls)

Eligibility Criteria

• Age: 18 Years+
• Sex: all
• Healthy Volunteers: No
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• Men and women age ≥ 18 years old (unless otherwise specified) Willing and able to provide written informed consent/assent ECOG Performance Status 0 - 1
• Patients with:
• Newly diagnosed breast cancer with tumor size \< 5 cm who are not eligible for I-SPY2 (to prevent recruitment competition), or not recommended to undergo standard of care neoadjuvant chemotherapy with at least one of the following features:
• Triple negative breast cancer (TNBC) defined using the ASCO CAP guidelines with the following modification supported by a recent publication as ER ≤ 10%, PR ≤ 10%, HER2- determined by immunohistochemistry and/or fluorescence in situ hybridization analyses and with tumor size ≤ 2.5 cm;
• HR+ HER2- breast cancer regardless of nodal status and age of diagnosis ≥ 50
• HR+ HER2- breast cancer and age of diagnosis \<50 with tumor size ≤ 2.5 cm and clinically node (+)
• HR+ or HR- and HER2+ breast cancer with tumor size ≤ 2.5 cm
• Ductal carcinoma in situ (DCIS) with microinvasion
• Locally recurrent breast cancer of any receptor subtype with no prior radiation, not recommended to receive neoadjuvant chemotherapy and expecting surgical excision as part of treatment.
• A female participant is eligible to participate if she is not pregnant, not breastfeeding, and at least one of the following conditions applies:
• Not a woman of childbearing potential (WOCBP) as defined in Appendix 2 of the study protocol OR
• A WOCBP who agrees to follow the contraceptive guidance in Appendix 2 during the treatment period and for at least 120 days for study treatments with risk of genotoxicity after the last dose of study treatment.
• Female participants of childbearing potential should be willing to use 2 methods of birth control or be surgically sterile, or abstain from heterosexual activity for the course of the study through 120 days after the last dose of study medication. Medically accepted methods of birth control include a diaphragm, cervical cap, latex condoms, surgical sterility, intrauterine devices (IUDs), hormonal implants, injectable contraceptives, or birth control pills. Participants of childbearing potential are those who have not been surgically sterilized or have not been free from menses for \> 1 year.
• Ability to tolerate radiation therapy (e.g., lie flat and hold position)
• Demonstrate adequate hematologic, renal, hepatic, thyroid, and bone marrow function

You may not qualify if:

• A WOCBP who has a positive urine pregnancy test within 72 hours prior to allocation. If the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required.
• A history of prior radiotherapy to the ipsilateral breast/chest wall that precludes delivery of hypofractionated radiotherapy.
• Has received prior therapy with an anti-PD-1, anti-PD-L1, or anti PD L2 agent or with an agent directed to another stimulatory or co-inhibitory T-cell receptor (eg, CTLA-4, OX 40, CD137).
• Has received prior systemic anti-cancer therapy including investigational agents within 4 weeks
• Has not adequately recovered from major surgery or has ongoing surgical complications
• Has a known additional malignancy that is progressing or requires active treatment. Exceptions include basal cell carcinoma of the skin, squamous cell carcinoma of the skin, or in situ cervical cancer that has undergone potentially curative therapy.
• Has active autoimmune disease that has required systemic treatment in the past 2 years except replacement therapy (eg., thyroxine, insulin, or physiologic corticosteroid)
• Participants with vitiligo or resolved childhood asthma/atopy would be an exception to this rule. Participants that require intermittent use of bronchodilators or local steroid injections would not be excluded from the study. Participants with hypothyroidism stable on hormone replacement or Sjogren's syndrome will not be excluded from the study. Steroid prep due to dye allergies prior to staging scans or use in anti-emetic prophylaxis is allowed.
• Has a history of (non-infectious) pneumonitis/interstitial lung disease that required steroids or has current pneumonitis/interstitial lung disease.
• Has an active infection requiring systemic therapy.
• Has a history or current evidence of any condition, therapy, or laboratory abnormality that might confound the results of the trial, interfere with the participant's participation for the full duration of the trial, or is not in the best interest of the participant to participate, in the opinion of the treating investigator.
• Has known psychiatric or substance abuse disorders that would interfere with cooperation with the requirements of the trial.
• Is pregnant or breastfeeding or expecting to conceive or father children within the projected duration of the trial, starting with the pre-screening or screening visit through 120 days after the last dose of trial treatment.
• Has a known history of human immunodeficiency virus (HIV) (HIV 1/2 antibodies).
• Has a known history of Hepatitis B (defined as Hepatitis B surface antigen \[HBsAg\] reactive) or known active Hepatitis C virus (defined as HCV RNA \[qualitative\] is detected) infection.

Sponsors & Collaborators

• Abramson Cancer Center at Penn Medicine: lead

Study Sites (1)

Perelman Center for Advanced Medicine

Philadelphia, Pennsylvania, 19104, United States

Location

MeSH Terms

Conditions

Breast Neoplasms

Interventions

Radiation Dose Hypofractionation; Radiotherapy; Blood Specimen Collection

Condition Hierarchy (Ancestors)

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

Intervention Hierarchy (Ancestors)

Dose Fractionation, Radiation; Radiotherapy Dosage; Therapeutics; Specimen Handling; Clinical Laboratory Techniques; Diagnostic Techniques and Procedures; Diagnosis; Punctures; Surgical Procedures, Operative; Investigative Techniques

Study Officials

• Julia C Tchou, MD

  University of Pennsylvania

  PRINCIPAL INVESTIGATOR

Study Design

• Study Type: interventional
• Phase: phase 1
• Allocation: NON RANDOMIZED
• Masking: NONE
• Purpose: TREATMENT
• Intervention Model: SEQUENTIAL
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Professor of Clinical Surgery

Study Record Dates

• First Submitted: June 22, 2020
• First Posted: July 1, 2020
• Study Start: December 7, 2020
• Primary Completion (Estimated): August 1, 2026
• Study Completion (Estimated): August 1, 2027
• Last Updated: March 10, 2026

Record last verified: 2026-03

Data Sharing

• IPD Sharing: Will not share

Locations

US (1)