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CpG-STAT3 siRNA CAS3/SS3 and Localized Radiation Therapy for the Treatment of Relapsed/Refractory B-Cell NHL

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT04995536
Recruitment Status : Withdrawn (no accrual)
First Posted : August 9, 2021
Last Update Posted : November 21, 2023
National Cancer Institute (NCI)
Information provided by (Responsible Party):
City of Hope Medical Center

Brief Summary:
This phase I trial identifies the best dose and side effects of CpG-STAT3 siRNA CAS3/SS3 (CAS3/SS3) in combination with localized radiation therapy in treating patients with B-cell non-Hodgkin lymphoma that has come back (relapsed) or does not respond to treatment (refractory). CAS3/SS3 simultaneously targets two molecules, TLR9 receptor and STAT3. This investigational drug combines a CpG oligonucleotide and an siRNA in one molecule that act together to interfere with the ability of the cancer cells to grow. Radiation therapy uses high energy x-rays to kill cancer cells and shrink tumors. Giving CAS3/SS3 with localized radiation therapy may kill more cancer cells.

Condition or disease Intervention/treatment Phase
Recurrent B-Cell Non-Hodgkin Lymphoma Recurrent Diffuse Large B-Cell Lymphoma Recurrent Grade 1 Follicular Lymphoma Recurrent Grade 2 Follicular Lymphoma Recurrent Grade 3 Follicular Lymphoma Recurrent Grade 3a Follicular Lymphoma Recurrent Grade 3b Follicular Lymphoma Recurrent Mantle Cell Lymphoma Recurrent Marginal Zone Lymphoma Recurrent Small Lymphocytic Lymphoma Refractory B-Cell Non-Hodgkin Lymphoma Refractory Diffuse Large B-Cell Lymphoma Refractory Grade 1 Follicular Lymphoma Refractory Grade 2 Follicular Lymphoma Refractory Grade 3 Follicular Lymphoma Refractory Grade 3a Follicular Lymphoma Refractory Mantle Cell Lymphoma Refractory Marginal Zone Lymphoma Refractory Small Lymphocytic Lymphoma Refractory Grade 3b Follicular Lymphoma Biological: CpG-STAT3 siRNA CAS3/SS3 Radiation: Radiation Therapy Phase 1

Detailed Description:


I. Determine the recommended phase 2 dose (RP2D) of CAS3/SS3 when given in combination with local fixed-dose radiation therapy (RT).

II. Evaluate the safety and feasibility of intratumoral injections of CAS3/SS3 when combined with local fixed-dose RT, by evaluation of toxicities including: type, frequency, severity, attribution, time course and duration.


I. Characterize the clinical activity (overall and per dose level) of CAS3/SS3 through the assessment of disease response, and response duration. (Clinical) II. Characterize the biologic activity (overall and per dose level) of CAS3/SS3 when combined with local fixed-dose RT by assessing. (Biologic [Immunologic Correlative Studies]) IIa. Silencing of the STAT3 gene and its key downstream genes. IIb. Local and systemic immune responses, including: evidence/extent of immune cell intratumoral infiltration, immune cell activation within the tumor and in the peripheral blood, and changes in proinflammatory mediators in plasma.


Patients undergo radiation therapy on days 1 and 2 tumor-bearing lymph node, and receive CAS3/SS3 intratumorally on days 2, 4, 16, and 18. Patients assigned to dose level 3 also receive CAS3/SS3 intratumorally on days 9, 11, 23, and 25.

After completion of study treatment, patients are followed up every 3 months.

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 0 participants
Allocation: N/A
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: A Phase I Study of Intratumoral Injections of CpG-STAT3 siRNA (CAS3/SS3) in Combination With Local Radiation in Patients With Relapsed/Refractory B-Cell Non-Hodgkin Lymphoma (NHL)
Estimated Study Start Date : May 1, 2023
Estimated Primary Completion Date : January 27, 2024
Estimated Study Completion Date : January 27, 2024

Arm Intervention/treatment
Experimental: Treatment (radiation therapy, CAS3/SS3)
Patients undergo radiation therapy on days 1 and 2 tumor-bearing lymph node, and receive CAS3/SS3 intratumorally on days 2, 4, 16, and 18. Patients assigned to dose level 3 also receive CAS3/SS3 intratumorally on days 9, 11, 23, and 25.
Biological: CpG-STAT3 siRNA CAS3/SS3
Given intratumorally
Other Names:
  • CAS3/SS3
  • CpG Oligodeoxynucleotide/STAT3 siRNA CAS3/SS3
  • CpG/Anti-STAT3 siRNA CAS3/SS3
  • CpG/STAT3 siRNA CAS3/SS3
  • TLR9 Agonist/STAT3 siRNA Conjugate CAS3/SS3

Radiation: Radiation Therapy
Undergo radiation therapy
Other Names:
  • Cancer Radiotherapy
  • Irradiate
  • Irradiated
  • Irradiation
  • Radiation
  • Radiation Therapy, NOS
  • Radiotherapeutics
  • Radiotherapy
  • RT
  • Therapy, Radiation

Primary Outcome Measures :
  1. Incidence of adverse events [ Time Frame: Up to 6 months ]
    Toxicity will be graded according to the National Cancer Institute-Common Terminology Criteria for Adverse Events version 5. Observed toxicities will be summarized in terms of type (organ affected or laboratory determination), severity, attribution, time of onset, duration, and reversibility or outcome.

  2. Dose Limiting Toxicity [ Time Frame: Up to 56 days ]
    Grade 3 or higher toxicities at least possibly related to study treatment as assessed by CTCAE, with noted exceptions.

Secondary Outcome Measures :
  1. Overall response [ Time Frame: From 56 days through 6 months ]
    Will be categorized using the 2014 Lugano response criteria for malignant lymphoma.

  2. Response duration [ Time Frame: Up to 6 months ]
    Time interval from the date of first documented response (CR or PR) to documented disease relapse, progression or death whichever occurs first, assessed up to 2 years

  3. Suppression of STAT3 expression [ Time Frame: up to 56 days ]
    Measurement of STAT3 mRNA cleavage in lymph node tissue and peripheral blood mononuclear cells using RACE

  4. Suppression of STAT3 activation of downstream targets. [ Time Frame: Up to 19 days ]
    Suppression of STAT3 activation of downstream target genes and immune genes as assessed by Nanostring in lymph node tissue

  5. Activation of immune cells [ Time Frame: Up to 56 days ]
    Serum IFNs, IP-10, MCP1 levels will be evaluated as evidence for systemic effects of CAS3/SS3 injections.

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • All subjects must have the ability to understand and the willingness to sign a written informed consent
  • Age 18 and older
  • Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1 (corresponds to Karnofsky Performance Status [KPS] of >= 70)
  • Life expectancy greater than 16 weeks
  • Relapsed/refractory disease; patients must have failed >= 2 prior systemic therapies and have no treatment options known to provide clinical benefit
  • Biopsy confirmed relapsed or refractory B-cell lymphoma of the following subtypes; patients with a partial response to a previous treatment are allowed.

    • Follicular grade 1 or 2, or 3 marginal zone or small lymphocytic lymphoma
    • Diffuse large B-cell lymphoma, non-germinal center B-cell like (GCB) type determined by immunohistochemistry using Han's algorithm
    • Mantle cell lymphoma
  • Patients must have at least two separate tumor sites, one of which is at least 2 cm in diameter and peripherally accessible and amenable for intratumoral injection of CAS3/SS3 with stabilization by palpation, and the other is at least 1.5 cm in diameter
  • Tumor specimens must be available for immunological studies either from a previous biopsy or a new biopsy obtained before the initiation of the study. Paraffin-embedded specimens are acceptable
  • Required wash out periods for prior therapy:

    • Topical therapy: 2 weeks
    • Chemotherapy: 4 weeks
    • Radiotherapy: 4 weeks
    • Other investigational therapy: 4 weeks
    • Monoclonal antibody or immunotherapy: 4 weeks
    • Targeted therapies: 4 weeks
    • Allogeneic transplant: 6 months
  • Absolute neutrophil count (ANC) >= 1,000/mm^3

    • NOTE: Growth factor is not permitted within 14 days of ANC assessment unless cytopenia is secondary to disease involvement
  • Platelets >= 75,000/mm^3

    • NOTE: Platelet transfusions are not permitted within 14 days of platelet assessment unless cytopenia is secondary to disease involvement
  • Hemoglobin >= 8 g/dl
  • Total serum bilirubin (mg/dL): =< 1.5 x upper normal limit (ULN)
  • Aspartate aminotransferase (AST) < 3 x ULN without liver metastasis and < 5 x ULN with liver metastasis
  • Alanine aminotransferase (ALT) < 3 x ULN without liver metastasis and < 5 x ULN with liver metastasis
  • Adequate renal function as determined by serum creatinine =< 2.0 mg/dL or creatinine clearance of >= 50 mL/min per the Cockcroft-Gault formula
  • International normalized ratio (INR) OR prothrombin (PT) =< 1.5 x ULN
  • Activated partial thromboplastin time (aPTT) =< 1.5 x ULN
  • Female of childbearing potential: serum pregnancy test
  • Cardiac function 12-lead electrocardiogram (ECG) to confirm the absence of clinically significant arrhythmias
  • Left ventricular ejection fraction (LVEF) >= 45%
  • Oxygen saturation on room air of >= 92%
  • The effects of CAS3/SS3 on the developing fetus are unknown. For this reason, women of child-bearing potential and men must agree to use adequate contraception (hormonal or barrier method of birth control or abstinence) prior to study entry and for six months following duration of study participation. Should a woman become pregnant or suspect that she is pregnant while participating on the trial, she should inform her treating physician immediately

Exclusion Criteria:

  • Patients may not be receiving any other investigational agents, or concurrent biological, chemotherapy, or radiation therapy
  • Current use of anticoagulant therapy (aspirin [ASA] =< 325 mg per day allowed) or history of significant bleeding diathesis
  • Treatment with corticosteroids or other systemic immunosuppressive medication (e.g., methotrexate, rapamycin) within 28 days of study treatment. Note: patients with adrenal insufficiency may take up to 7.5 mg of prednisone or equivalent daily. Topical and inhaled corticosteroids in standard doses are allowed
  • Patients with rapid progression of disease requiring immediate anti lymphoma therapy
  • Patients should not have any uncontrolled illness including ongoing or active infection
  • Pregnant or lactating women are excluded from this study because CAS3/SS3is an agent with the potential for teratogenic or abortifacient effects. Because there is an unknown but potential risk for adverse events in nursing infants secondary to treatment of the mother with CAS3/SS3, breastfeeding should be discontinued if the mother is treated with CAS3/SS3
  • 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
  • Pre-existing autoimmune or antibody mediated disease including: systemic lupus erythematosus, rheumatoid arthritis, multiple sclerosis, Sjogren's syndrome, autoimmune thrombocytopenia, Addison's disease, but excluding the presence of autoantibodies without clinical autoimmune disease
  • History of inflammatory bowel disease (e.g., Crohn's disease or ulcerative colitis), celiac disease, or other chronic gastrointestinal conditions associated with diarrhea, or current acute colitis of any origin
  • History of diverticulitis (even a single episode) or evidence of diverticulitis at baseline, including evidence limited to computed tomography (CT) scan only. Note: diverticulosis is not an exclusion criterion per se
  • Graft versus host disease
  • Severe psoriasis
  • Active thyroiditis
  • History of uveitis
  • Known history of human immunodeficiency virus (HIV) with detectable viral load or patients with acquired immuno-deficiency syndrome (AIDS) are excluded
  • Known active or chronic viral hepatitis B or C infection
  • Patients with active infection or with a fever > 38.5 degrees Celsius (C) within three days prior to the first scheduled treatment
  • Active central nervous system (CNS) metastases
  • History of allergic reactions attributed to compounds of similar composition to agatolimod sodium (PF-3512676) or tremelimumab
  • History of allergic reactions attributed to compounds of similar chemical or biologic composition to CAS3/SS3
  • Significant cardiovascular disease (i.e. New York Heart Association [NYHA] >= class 3 congestive heart failure; myocardial infarction within the past 6 months; unstable angina; coronary angioplasty within the past 6 months; uncontrolled atrial or ventricular cardiac arrhythmias)
  • Any other condition that would, in the Investigator's judgment, contraindicate the patient's participation in the clinical study due to safety concerns with clinical study procedures
  • Prospective participants who, in the opinion of the investigator, may not be able to comply with all study procedures (including compliance issues related to feasibility/logistics)

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT04995536

Sponsors and Collaborators
City of Hope Medical Center
National Cancer Institute (NCI)
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Principal Investigator: Lihua E Budde City of Hope Medical Center
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Responsible Party: City of Hope Medical Center Identifier: NCT04995536    
Other Study ID Numbers: 20589
NCI-2021-06965 ( Registry Identifier: CTRP (Clinical Trial Reporting Program) )
20589 ( Other Identifier: City of Hope Medical Center )
P30CA033572 ( U.S. NIH Grant/Contract )
P50CA107399 ( U.S. NIH Grant/Contract )
Scopus Biopharma ( Other Identifier: Scopus Biopharma )
First Posted: August 9, 2021    Key Record Dates
Last Update Posted: November 21, 2023
Last Verified: November 2023

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Studies a U.S. FDA-regulated Drug Product: Yes
Studies a U.S. FDA-regulated Device Product: No
Product Manufactured in and Exported from the U.S.: No
Additional relevant MeSH terms:
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Lymphoma, Follicular
Lymphoma, Non-Hodgkin
Lymphoma, B-Cell
Lymphoma, Mantle-Cell
Lymphoma, B-Cell, Marginal Zone
Lymphoma, Large B-Cell, Diffuse
Leukemia, Lymphocytic, Chronic, B-Cell
Neoplasms by Histologic Type
Lymphoproliferative Disorders
Lymphatic Diseases
Immunoproliferative Disorders
Immune System Diseases
Disease Attributes
Pathologic Processes
Leukemia, B-Cell
Leukemia, Lymphoid
Hematologic Diseases
Chronic Disease
Adjuvants, Immunologic
Immunologic Factors
Physiological Effects of Drugs