In Situ Vaccine for Low-Grade Lymphoma: Combination of Intratumoral Flt3L and Poly-ICLC With Low-Dose Radiotherapy

September 21, 2022 updated by: Joshua Brody

A Phase I/II Study of Intratumoral Injection of rhuFlt3L/CDX-301 and Poly-ICLC in Combination With Low-Dose Radiotherapy in Low-Grade B-cell Lymphomas

Our recent trials combining local radiotherapy with intratumoral administration of TLR agonists - referred to as 'in situ vaccination' - for patients with low-grade lymphoma demonstrated safety, induction of anti-tumor CD8 T cell responses and partial and complete remissions of patients' non-irradiated sites of disease with complete remissions lasting from months to more than three years.

This iteration of the in situ vaccine approach builds on our prior work in ways that should improve its efficacy, by adding Flt3L and changing the toll-like receptors (TLR) agonist to poly-ICLC -an optimal TLR agonist for the type of dendritic cells (DC) recruited by Flt3L. The vaccine is thus in 3 phases:

  1. intratumoral Flt3L administration recruits DC to the tumor
  2. low-dose radiotherapy to release tumor antigens
  3. intratumoral poly-ICLC administration activates tumor-antigen loaded DC

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

Lymphomas comprise the 5th most common cancer in the U.S. with approximately 80,000 new cases diagnosed in the U.S. each year. Low-grade B-cell lymphomas are the most prevalent subtype amongst these and are considered incurable with standard therapies. Chemotherapy and monoclonal antibody therapy induce temporary remissions, though disease generally recurs, becomes progressively more resistant to therapy and ultimately therapy-resistant. Standard therapies prolong survival, though there is no standard of care regarding when to initiate therapy (versus observation) or the optimal sequence of different therapies. Novel therapies are needed with distinct mechanisms and with greater tolerability profiles. Immunotherapy has a long precedent of being able to cure low-grade lymphomas with allogeneic transplant being curative in a proportion of chemo-refractory patients, though the morbidity of this procedure reduces its broader utilization.

Previously, we completed four trials combining local radiotherapy (a standard of care for these diseases) with intratumoral administration of TLR agonists - an approach we refer to as 'in situ vaccination' for patients with previously untreated or relapsed/refractory low-grade lymphoma. We demonstrated safety, induction of anti-tumor CD8 T cell responses and partial and complete remissions of patients' non-irradiated sites of disease.1, 2 The most recent trials compared previously untreated versus relapsed/refractory patients receiving the same therapy and observed superior responses in the former group, presumably due to immunosuppressive effects of prior treatments in the latter group. The in situ vaccine is premised on pre-clinical data showing this approach to be superior to systemic TLR agonist delivery3 and our clinical results reproduce this finding; in situ vaccination yields superior response rates as compared to trials of systemic TLR agonist therapy for lymphoma.4

This iteration of the in situ vaccine approach builds on our prior work in ways that should improve its efficacy, by making two changes to the prior approach:

  1. intratumoral administration of rhuFlt3L/CDX-301 to recruit dendritic cells to the tumor site
  2. intratumoral administration of poly-ICLC. Flt3L has been safely administered to patients with lymphoma5 and -pre-clinically- has been shown to induce tumor leukocyte infiltration and regression of lymphoma tumors.6, 7 A total of 36 healthy volunteers and 294 cancer patients were treated including only industry-sponsored studies with the prior formulation of this agent (AMG 949) with excellent tolerability and 30 healthy volunteers were recently treated with the current formulation (CDX-301), again with excellent tolerability.

Poly-ICLC has been safely administered to patients with lymphoma8 and -pre-clinically- has been shown to induce natural killer (NK) cell cytolytic activity and regression of lymphoma tumors.9-11 Over 600 healthy volunteers and cancer patients in 17 trials have been treated with comparable doses of poly-ICLC as that used here with excellent tolerability.

Study Type

Interventional

Enrollment (Actual)

21

Phase

  • Phase 2
  • Phase 1

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United States
    • New York
      • New York, New York, United States, 10029
        • Icahn School of Medicine at Mount Sinai

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • Biopsy-confirmed low-grade B-cell lymphoma or cutaneous T cell lymphoma; specifically, follicular grade 1, 2, or 3A, marginal zone or small lymphocytic lymphoma, or mycosis fungoides of any initial stage. Patients in cohort A must be relapsed/refractory after at least one prior systemic therapy and patients in cohort B must have had no prior systemic therapy.
  • Patients must have at least one site of disease that is accessible for intratumoral injection percutaneously (e.g. inguinal, axillary, cervical, or subcutaneous).
  • Tumor specimens must be available for immunological studies, either from a previous biopsy or a new biopsy obtained before the initiation Day 1 of the study.
  • Patients must have measurable disease other than the injection site or biopsy site, i.e. greater than 1.5 cm bi-dimensionally on standard computed tomography imaging.
  • ECOG Performance Status of 1 or better (corresponds to Karnofsky Performance Status (KPS) of ≥ 70)
  • Patients must be 18 years of age or older.
  • Adequate bone marrow function: WBC ≥ 2,000/μL; platelet count ≥ 75,000/mm3; ANC ≥ 1000/μL.
  • Adequate renal function: serum creatinine ≤ 2.0mg/dL.
  • Adequate hepatic function: bilirubin ≤ 1.5 mg/dL; SGOT/SGPT < 3 x upper limit of normal

  • Required wash out periods for prior therapy (for cohort B):

    1. Topical therapy: 2 weeks
    2. Chemotherapy: 4 weeks
    3. Radiotherapy: 4 weeks
    4. Other investigational therapy: 4 weeks
    5. Rituximab: 12 weeks
  • Patients of reproductive potential and their partners must agree to use an effective (> 90% reliability) form of contraception during the study and for 4 weeks following the last study drug administration.
  • Women of reproductive potential must have negative urine pregnancy test.
  • Life expectancy greater than 4 months.
  • Able to comply with the treatment schedule.
  • Ability to understand and the willingness to sign a written informed consent document.

Exclusion Criteria:

  • Pre-existing autoimmune or antibody -mediated disease including: systemic lupus, erythematosus, rheumatoid arthritis, multiple sclerosis, Sjogren's syndrome, autoimmune thrombocytopenia, history of uveitis. Patients with controlled thyroid disease, or the presence of auto-antibodies without clinical autoimmune disease, are permitted on study.
  • Known history of human immunodeficiency virus (HIV).
  • Patients with active infection.
  • Known CNS metastases.
  • Prior malignancy (active within 5 years of screening) except basal cell or completely excised non-invasive squamous cell carcinoma of the skin, or in situ squamous cell carcinoma of the cervix.
  • History of allergic reactions to compounds of similar composition to either CDX-301 or poly-ICLC.
  • Current anticoagulant therapy. (ASA ≤ 325 mg per day is allowed.).
  • Significant cardiovascular disease (i.e. NYHA class 3 congestive heart failure; myocardial infarction with the past 6 months; unstable angina; coronary angioplasty with the past 6 months; uncontrolled atrial or ventricular cardiac arrhythmias).
  • Pregnant or lactating.
  • Any other medical history, including laboratory abnormalities, deemed by the investigator to be likely to interfere with their participation in the study, or to interfere with the interpretation of the results.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: rhuFlt3L/CDX-301
intratumoral injections on days 1-5 and 8-11. and Poly-ICLC intratumoral injection weekly, weeks 2-8
Drug: rhuFlt3L/CDX-301

rhuFlt3L/CDX-301 is a truncated, soluble, recombinant human fms-like tyrosine kinase-3 ligand (Flt3L), expressed in a Chinese hamster ovary cell.

RhuFlt3L/CDX-301 is formulated as a sterile solution intended for single-use parenteral administration. Each vial contains 2.5 mg/mL rhuFlt3L/CDX-301 in a 1 mL of buffered solution composed of Sodium Phosphate and Sodium Chloride, with a pH of 7.

Drug: Poly-ICLC
Poly-ICLC is supplied by Oncovir in single-dose vials containing 1 mL of 2 mg/mL opalescent white suspension. Each milliliter of Poly-ICLC for injection contains 2 mg/mL poly-IC, 1.5 mg/mL poly-L-lysine, and 5 mg/mL sodium carboxymethylcellulose in 0.9% sodium chloride solution and adjusted to pH 7.6-7.8 with sodium hydroxide.
Other Names:
  • Hiltonol

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
response rate
Time Frame: week 12
Overall objective response rate at time of best response as defined by International Harmonization (Cheson) Criteria.
week 12

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
safety profile
Time Frame: week 1
Patient reported and clinical observation of adverse events, including changes in physical examination, peripheral blood hematology and serum chemistry
week 1
safety profile
Time Frame: week 2
Patient reported and clinical observation of adverse events, including changes in physical examination, peripheral blood hematology and serum chemistry
week 2
safety profile
Time Frame: week 4
Patient reported and clinical observation of adverse events, including changes in physical examination, peripheral blood hematology and serum chemistry
week 4
safety profile
Time Frame: week 6
Patient reported and clinical observation of adverse events, including changes in physical examination, peripheral blood hematology and serum chemistry
week 6
safety profile
Time Frame: week 8
Patient reported and clinical observation of adverse events, including changes in physical examination, peripheral blood hematology and serum chemistry
week 8
safety profile
Time Frame: week 12
Patient reported and clinical observation of adverse events, including changes in physical examination, peripheral blood hematology and serum chemistry
week 12
tumor-specific immune response
Time Frame: baseline
Pre- to post-treatment induction of systemic (peripheral blood) tumor-specific immune response.
baseline
tumor-specific immune response
Time Frame: week 2
Pre- to post-treatment induction of systemic (peripheral blood) tumor-specific immune response.
week 2
tumor-specific immune response
Time Frame: week 4
Pre- to post-treatment induction of systemic (peripheral blood) tumor-specific immune response.
week 4
tumor-specific immune response
Time Frame: week 6
Pre- to post-treatment induction of systemic (peripheral blood) tumor-specific immune response.
week 6
tumor-specific immune response
Time Frame: week 8
Pre- to post-treatment induction of systemic (peripheral blood) tumor-specific immune response.
week 8
tumor-specific immune response
Time Frame: week 12
Pre- to post-treatment induction of systemic (peripheral blood) tumor-specific immune response.
week 12

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Joshua Brody

Collaborators

Celldex Therapeutics

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

January 3, 2014

Primary Completion (Actual)

November 20, 2020

Study Completion (Actual)

November 20, 2020

Study Registration Dates

First Submitted

October 30, 2013

First Submitted That Met QC Criteria

October 30, 2013

First Posted (Estimate)

November 6, 2013

Study Record Updates

Last Update Posted (Actual)

September 22, 2022

Last Update Submitted That Met QC Criteria

September 21, 2022

Last Verified

September 1, 2022

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • GCO 13-1347

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

Clinical Trials on Low-Grade B-cell Lymphoma

Clinical Trials on rhuFlt3L/CDX-301

Search Similar Trials

Sponsors and Collaborators

Medical Conditions

Drug Interventions

CROs by country

CROs in Bulgaria

Conditions

Rare Diseases

Drug Interventions

Dietary Supplements

Sponsor/Collaborators

Locations

3
Subscribe