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Breast CancerPhase 2CBCVNCT03804944

Converting HR+ Breast Cancer Into an Individualized Vaccine

A Phase 2 study testing Focal Radiation therapy, Pembrolizumab (200mg IV for 30 minutes and CDX-301 in people with Breast Cancer, run by Weill Medical College of Cornell University at 8 sites in United States.

Recruiting

Looking for participants now. Contact the study team or a site below to ask about taking part.

Sites and contacts
Official record
Search all trials

Trial summary

Newly diagnosed post-menopausal women with clinical stage II-III, HR+HER2- breast cancer are eligible to a randomized trial, concurrently open at five US academic institutions. Patients receiving 4 months of standard neoadjuvant hormonal therapy with letrozole are randomly assigned to one of 4 arms of a trial testing… Read more about this study

Who is it for?
Ages 18 to 90 years, women only
Conditions the study is for
Breast Cancer
What is being tested?
Focal Radiation therapy, Pembrolizumab (200mg IV for 30 minutes and CDX-301
Could I receive a placebo?
No, everyone receives an active treatment
How many people
100 participants
Where
8 sitesUnited States
Study dates
17 Mar 2020to 31 Dec 2027
Phase
Phase 2
Are there results?
Not yet: the study is under way

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 to 90 years
  • Women only
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Post-menopausal female ≥ 18 years of age (Post-menopausal status defined as either 1) at least 2 years without menstrual period or 2) or patients older than 50 with serological evidence of post-menopausal status or 3) hysterectomized patients of any age with FSH confirmation of post-menopausal status.
  • Eastern Cooperative Oncology Group (ECOG) performance status 0-1
  • Biopsy proven diagnosis of ER+ PR+ or PR- HER2- breast cancer.
  • Clinical stage I(>1.5cm, if N0) - III breast cancer, as per AJCC staging 8th edition.
  • Patient needs to be able to understand and demonstrate willingness to sign a written informed consent document.
  • Adequate bone marrow reserve and liver function:
  • WBC ≥ 2000/uL Absolute neutrophil count (ANC) ≥1500/μL Platelets ≥100 000/μL Hemoglobin ≥9.0 g/dL or ≥5.6 mmol/La Creatinine OR Measured or calculated creatinine clearance (GFR can also be used in place of creatinine or CrCl) ≤1.5 × ULN OR ≥30 mL/min for participant with creatinine levels >1.5 × institutional ULN Total bilirubin ≤1.5 ×ULN OR direct bilirubin ≤ULN for participants with total bilirubin levels >1.5 × ULN AST (SGOT) and ALT (SGPT) ≤2.5 × ULN (≤5 × ULN for participants with liver metastases) International normalized ratio (INR) OR prothrombin time (PT) Activated partial thromboplastin time (aPTT) ≤1.5 × ULN unless participant is receiving anticoagulant therapy as long as PT or aPTT is within therapeutic range of intended use of anticoagulants

Who cannot join

  • Active connective tissue disorders, such as lupus or scleroderma requiring flare therapy
  • Current use of systemic chemotherapy, endoctine therap or HER2-neu targeted therapy
  • Post surgical excision of breast cancer.
  • Previous radiotherapy of the same breast.
  • 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).
  • Inability to obtain histologic proof of breast cancer
Show all 18Show fewer
  • Has received a live vaccine within 30 days prior to the first dose of study drug.
  • Examples of live vaccines include, but are not limited to, the following: measles, mumps, rubella, varicella/zoster (chicken pox), yellow fever, rabies, Bacillus Calmette-Guérin (BCG), and typhoid vaccine. Seasonal influenza vaccines for injection are generally killed virus vaccines and are allowed; however, intranasal influenza vaccines (eg, FluMist®) are live attenuated vaccines and are not allowed.
  • Is currently participating in or has participated in a study of an investigational agent or has used an investigational device within 4 weeks prior to the first dose of study treatment. Note: Participants who have entered the follow-up phase of an investigational study may participate as long as it has been 4 weeks after the last dose of the previous investigational agent.
  • Has a diagnosis of immunodeficiency or is receiving chronic systemic steroid therapy (in dosing exceeding 10 mg daily of prednisone equivalent) or any other form of immunosuppressive therapy within 7 days prior to the first dose of study drug.
  • Has a known additional malignancy (second primary) that is progressing or has required active treatment within the past 3 years. Note: Participants with basal cell carcinoma of the skin, squamous cell carcinoma of the skin, or carcinoma in situ (e.g. cervical cancer in situ) that have undergone potentially curative therapy are not excluded.
  • Has severe hypersensitivity (≥Grade 3) to pembrolizumab and/or any of its excipients.
  • Has active autoimmune disease that has required systemic treatment in the past 2 years (i.e. with use of disease modifying agents, corticosteroids or immunosuppressive drugs). Replacement therapy (eg., thyroxine, insulin, or physiologic corticosteroid replacement therapy for adrenal or pituitary insufficiency, etc.) is not considered a form of systemic treatment.
  • Has a history of (non-infectious) pneumonitis that required steroids or has current pneumonitis.
  • Has an active infection requiring systemic therapy.Has a known history of Human Immunodeficiency Virus (HIV). Note: No HIV testing is required unless mandated by local health authority.
  • 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. Note: no testing for Hepatitis B and Hepatitis C is required unless mandated by local health authority.
  • Has a known history of active TB (Bacillus Tuberculosis). Note: optional based on country.
  • Has known psychiatric or substance abuse disorders that would interfere with cooperation with the requirements of the trial.

Trial locations and contacts

8 sites in 1 country. Contact the study team or a site near you to ask about taking part.

Fabiana Gregucci, M.D. contact

646 962-3110

fgr4002@med.cornell.edu

8 sites in 1 country

United States8 sites, 5 recruiting
  • UT Southwestern Medical Center

    Dallas, Texas, 75390-9179

    Shahbano Shakeel, 214-645-9682, shahbano.shakeel@utsouthwestern.edu

    Heather McArthur, M.D.

    Recruiting
  • Houston Methodist Cancer Center

    Houston, Texas, 77030

    Genevieve Santibanez, CCRP, 713-441-0685, gsantibanez@houstonmethodist.org

    Jenny Chang, M.D.

    Recruiting
  • Cedars-Sinai Medical Center

    Los Angeles, California, 90048

    Withdrawn
  • Icahn School of Medicine at Mt Sinai

    New York, New York, 10027

    Withdrawn
  • New York Presbyterian Hospital - Queens

    New York, New York, 10065

    Sarah Stankiewich, 718-661-7246, sas9306@nyp.org

    Sharanya Chandrasekhar, 6469623110, shc2043@med.cornell.edu

    Recruiting
  • Weill Cornell Medicine New York Presbyterian Hospital

    New York, New York, 10065

    Fabiana Gregucci, M.D., 6469623110, fgr4002@med.cornell.edu

    Silvia Formenti, M.D.

    Recruiting
  • Brooklyn Methodist Hospital - NewYork Presbyterian

    New York, New York, 11215

    Sharanya Chandrasekhar, M.S., 6469622196, shc2043@med.cornell.edu

    Pragya Yadav, Ph.D., 6469622199, pry2003@med.cornell.edu

    Recruiting
  • UPMC Hillman Cancer Center

    Pittsburgh, Pennsylvania, 15232

    Withdrawn

Other trials in United States

About this study

Newly diagnosed post-menopausal women with clinical stage II-III, HR+HER2- breast cancer are eligible to a randomized trial, concurrently open at five US academic institutions. Patients receiving 4 months of standard neoadjuvant hormonal therapy with letrozole are randomly assigned to one of 4 arms of a trial testing focal hypo-fractionated RT alone or with immunotherapy combinations.

Read the detailed description

Patients will be on the study for a total of 5 months, this includes 4 months on active study intervention, with breast surgery at week 16 and one month follow up period, after surgery. Patients will be randomly assigned to one of these 4 arms - 1. Anti-PD1 antibody pembrolizumab (Keytruda, Merck) will be infused day 12, at the standard dose of 200 mg IV over 30 minutes, repeated every 3 weeks until disease progression or unacceptable toxicity. 2. FLT3L (CDX-301, the recombinant human protein by Celldex) will be self-administered subcutaneously, in 5 consecutive daily injections, week 1, day 1-5. 3. For all arms radiation therapy to the breast tumor will begin on week 2 (Day 8,10,12), at dose of 8 Gy x 3 fractions, every other day. 4. Letrozole (Femara ®, Novartis) 2.5 mg tabs, once a day, daily for 4 months, until surgery, and thereafter is decided by the treating physician.

Conditions
Breast Cancer
Being tested
Focal Radiation therapy, Pembrolizumab (200mg IV for 30 minutes, CDX-301
Medical subject headings
Breast Neoplasms

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • Focal Radiation therapyRadiation

    Focal hypo-fractionated radiation therapy 8 Gy x 3 fractions, starting day 8, every other day (M/W/F or W/F/M or F/M/W).

  • Pembrolizumab (200mg IV for 30 minutesDrug

    Pembrolizumab, on day 12 (last day of radiotherapy), infused over 200mg IV over 30 minutes and then repeated every 3 weeks until disease progression or unacceptable toxicity.

  • CDX-301Biological

    Ftl-3 ligand, self-administered by subcutaneous injections at week 1, daily, for 5 consecutive days.

Study groups in NCT03804944
Study groupRoleWhat they receive
ARM 1Active comparatorFocal hypo-fractionated radiation therapy 8 Gy x 3 fractions, starting day 8, every other day (M/W/F or W/F/M or F/M/W).
Receives: Radiation: Focal Radiation therapy
ARM 2Active comparatorFocal hypo-fractionated radiation therapy - 8 Gy x 3 fractions starting day 8, every other day (M/W/F or W/F/M or F/M/W). + Pembrolizumab, on day 12 (last day of radiotherapy), infused over 200mg IV over 30 minutes and then repeated every 3 weeks until disease progression or unacceptable toxicity.
Receives: Radiation: Focal Radiation therapy; Drug: Pembrolizumab (200mg IV for 30 minutes
ARM 3Active comparatorFtl-3 ligand, self-administered by subcutaneous injections at week 1, daily, for 5 consecutive days + Focal hypo-fractionated radiation therapy - 8 Gy x 3 fractions starting day 8, (every other day (M/W/F or W/F/M or F/M/W).
Receives: Radiation: Focal Radiation therapy; Biological: CDX-301
ARM 4Active comparatorFtl-3 ligand, self administered subcutaneous injections at day 1 for 5 consecutive days+ Focal hypo-fractionated Radiation therapy starting day 8, - 8 Gy x 3 fractions, every other day (M/W/F or W/F/M or F/M/W). + Pembrolizumab, on day 12 (last day of radiotherapy), 200mg IV infused over 30 minutes then repeated every 3 weeks until disease progression or unacceptable toxicity.
Receives: Radiation: Focal Radiation therapy; Drug: Pembrolizumab (200mg IV for 30 minutes; Biological: CDX-301

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Tolerability will be demonstrated if no grade 3 or higher toxicities are observed in the first 8 patients, of each arm.

    Tolerability of adding immunotherapy to a combination of tumor radiotherapy and endocrine therapy in the neoadjuvant setting of newly diagnosed HR+ breast cancer patients will be assessed if no grade 3 or higher toxicities are observed in the first 8 patients of each arm. CTCAE version 5.0 will be used.

    Measured: 3 years

  2. Clinical response rate to tumor radiation +/-immunotherapy during standard endocrine therapy for HR+ breast cancer will be measured.

    Clinical response rate to tumor radiation +/-immunotherapy during standard endocrine therapy for HR+ breast cancer will be measured.

    Measured: 3 years

  3. Pathological response rate to tumor radiation +/-immunotherapy during standard endocrine therapy for HR+ breast cancer will be measured.

    Pathological response rate to tumor radiation +/-immunotherapy during standard endocrine therapy for HR+ breast cancer will be measured.

    Measured: 3 years

Secondary outcomes (2)
  1. Local immune response will be measured by assessing tumor specimens for T-cell infiltration at baseline and and during treatment.

    Local immune response will be measured by assessing tumor specimens for T-cell infiltration at baseline and and during treatment.

    Measured: 4 years

  2. Systemic immune response will be measured by collecting serial blood samples for serum and peripheral blood mononuclear cells (PBMCs) at multiple time points.

    Systemic immune response will be measured by collecting serial blood samples for serum and peripheral blood mononuclear cells (PBMCs) at multiple time points.

    Measured: 4 years

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted15 Jan 2019
  2. Study start17 Mar 2020
  3. Primary completion31 Dec 2026 (estimated)
  4. Study completion31 Dec 2027 (estimated)

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 2
Primary purpose
Treatment
Allocation
Randomised
Intervention model
Parallel groups
Model description
Patients will be on the study for a total of 5 months, this includes 4 months on active study intervention, with breast surgery at week 16 and one month follow up period, after surgery. Patients will be randomly assigned to one of the following arms. 1. Anti-PD1 antibody pembrolizumab (Keytruda, Merck) will be infused day 12, at the standard dose of 200 mg IV over 30 minutes, repeated every 3 weeks until disease progression or unacceptable toxicity. 2. FLT3L (CDX-301, the recombinant human protein by Celldex) will be self-administered subcutaneously, in 5 consecutive daily injections, week 1, day 1-5. 3\. For all arms radiation therapy to the breast tumor will begin on week 2 (Day 8,10,12), at dose of 8 Gy x 3 fractions, every other day. 4. Letrozole (Femara ®, Novartis) 2.5 mg tabs, once a day, daily for 4 months, until surgery, and thereafter is decided by the treating physician
Masking
None (open label)
Enrolment
100 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT03804944
Sponsor's protocol ID
1808019498
Acronym
CBCV
Status last verified
Jan 2026
First submitted
9 Jan 2019
Last updated
28 Jan 2026
Results posted
No
Data monitoring committee
Yes
FDA-regulated drug
Yes
FDA-regulated device
No
Individual data sharing
No

Questions about this trial

What is this clinical trial studying?

A Phase 2 study testing Focal Radiation therapy, Pembrolizumab (200mg IV for 30 minutes and CDX-301 in people with Breast Cancer, run by Weill Medical College of Cornell University at 8 sites in United States.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 7 inclusion and 18 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: looking for participants now, as of the sponsor's last update on 28 Jan 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 8 sites in United States. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

This study is still under way. Results are not available in the source record yet.

How can a doctor refer a patient or contact the research team?

Contact Fabiana Gregucci, M.D. (646 962-3110, fgr4002@med.cornell.edu), or a site near the patient. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Tolerability will be demonstrated if no grade 3 or higher toxicities are observed in the first 8 patients, of each arm. (time frame: 3 years). The study lists 3 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 28 Jan 2026.

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