Safety and Efficacy Study of ALT-801 to Treat Progressive Metastatic Malignancies

Phase 1

Completed

Conditions: Progressive Metastatic Malignancies

Registration Number: NCT00496860

Lead Sponsor: Altor BioScience

Brief Summary: This is a Phase 1, open-labeled, non-randomized, multi-center, competitive enrollment and dose-escalation study of ALT-801, the study drug. The purpose of this study is to evaluate the safety, determine the maximum-tolerated dose (MTD) and characterize the pharmacokinetic profile of ALT-801 in previously treated patients with progressive metastatic malignancies. ALT-801, a recombinant fusion protein with a interleukin-2 (IL-2) component, has a targeting mechanism that recognizes tumor cells with a specific tumor marker.

Detailed Description: Most current cancer treatment strategies involve the use of chemotherapeutic or biological drugs that exhibit variable efficacy and considerable toxicity. The limitations are often the result of the adverse side effects of the therapeutic drug on normal tissues. One approach to control these effects is to target the therapy to the tumor site. Of the identified tumor antigens, the human p53 tumor suppressor protein is overexpressed in a wide range of human malignancies. p53 is an intracellular tumor suppressor protein that acts to arrest the proliferation of cells. When mutated, it loses its ability to suppress abnormal proliferation and exhibits a longer half-life than the wild-type protein, allowing for its accumulation in tumors. In addition, p53 overexpression correlates with tumor transformation and aggression and is associated with lower overall survival rates and resistance to chemotherapeutic intervention in cancer patients. Therefore, p53 appears to be a marker for a considerable number of human malignancies and represents a good target for immunotherapeutics. However, p53 cannot be used as a target for antibodies because it is not displayed independently on the cell surface. Instead, the p53 protein is processed intracellularly into peptide fragments that are then displayed on the cell surface in the context of major histocompatibility complex (MHC). These peptide/MHC complexes are recognized by T-cells via their T-cell receptors (TCRs). Recently it has been confirmed that the peptide fragment is significantly elevated in a wide range of human tumor tissues, particularly in melanoma, renal, lung, breast, colorectal, bladder, ovary, stomach, esophagus, lymphoma, liver, leukemia, and head \& neck cancer. Targeted approaches to concentrate therapeutic cytokines at the tumor sites that express p53 could provide considerable advantages over current treatment.

Interleukin-2 (IL-2) is a well-characterized growth factor for immune effector cells which play critical roles in tumor control and rejection. A recombinant human IL-2 has been approved for treating metastatic melanoma and renal cell carcinoma. However, the major drawback of IL-2 therapy is its severe systemic toxicity. As a result, use of high dose IL-2 is limited to specialized programs with experienced personnel and it is generally offered to patients who are responsive and have excellent organ function. Thus, there is a critical need for innovative strategies that enhance the effects of IL-2 or reduce its toxicity without compromising clinical benefits.

The study drug, ALT-801, is a biologic compound composed of interleukin-2 (IL-2) genetically fused to a humanized soluble T-cell receptor directed against the p53-derived antigen. This study is to evaluate whether directing IL-2 activity using ALT-801 to the patient's tumor sites that overexpress p53 results in clinical benefits.

The study drug will be administered by bolus intravenous infusion in an in-patient hospital setting under the supervision of a qualified physician experienced in the use of anti-cancer agents including high dose IL-2. An intensive care facility and specialists skilled in cardiopulmonary or intensive care medicine must be available. There are two treatment cycles. For each treatment cycle, patients will be admitted to the hospital, remain in the hospital during the study drug infusion period, and be discharged from the hospital the day after the last infusion at the Principal Investigator's discretion. There is a 10-day resting period between the treatment cycles. Tumor assessments will be done at weeks 7 and 11 after starting the study drug.

Recruitment & Eligibility

Status: COMPLETED

Sex: All

Target Recruitment: 26

Inclusion Criteria

Not provided

Exclusion Criteria

Not provided

Study & Design

Study Type: INTERVENTIONAL

Study Design: SINGLE_GROUP

Primary Outcome Measures

Name	Time	Method
The Safety and Toxicity of ALT-801 in Patients With Progressive Metastatic Malignancies	18 months	Number of serious adverse events per cohort
The Maximum-tolerated Dose (MTD) of ALT-801	18 months	Number of dose limiting toxicities (DLTs). A DLT is a toxicity that results in patient withdrawal from the study as defined in the protocol.

Secondary Outcome Measures

Name	Time	Method
Immunogenicity of ALT-801	24 months	Titer of anti-drug Abs at week 4
Clinical Antitumor Response to ALT-801	24 months	Number of subjects with a complete response (CR), partial response (PR) or stable disease (SD). CR is defined as disappearance of all tumor lesions selected for measurement. PR is defined as at least 30% decrease in the sum of all tumor lesions selected for measurement. Stable disease is defined as neither sufficient tumor shrinkage to qualify for PR nor sufficient tumor increase to qualify for progressive disease (PD) which is defined as at least 20% increase the sum of the all tumor lesions selected for measurement.
ALT-801 Induced Cell-mediated Immune Responses	24 months	Number of tumor-responsive (interferon-gamma positive (IFNg+)) immune cells in blood post dosing

Trial Locations

Locations (4): MD Anderson Cancer Center Orlando
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Orlando, Florida, United States
University of Colorado, Anschutz Cancer Pavillion
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Aurora, Colorado, United States
H. Lee Moffitt Cancer Center & Research Institute
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Tampa, Florida, United States
University of Washington, Seattle Cancer Care Center
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Seattle, Washington, United States