Phase I trial of ALT-801, an interleukin-2/T-cell receptor fusion protein targeting p53 (aa264-272)/HLA-A*0201 complex, in patients with advanced malignancies

Clin Cancer Res. 2011 Dec 15;17(24):7765-75. doi: 10.1158/1078-0432.CCR-11-1817. Epub 2011 Oct 12.


Purpose: ALT-801 is a bifunctional fusion protein comprising interleukin-2 (IL-2) linked to a soluble, single-chain T-cell receptor domain that recognizes a peptide epitope (aa264-272) of the human p53 antigen displayed on cancer cells in the context of HLA-A*0201 (p53+/HLA-A*0201). We evaluated the safety, pharmacokinetics, and pharmacodynamics of ALT-801 in p53+/HLA-A*0201 patients with metastatic malignancies.

Experimental design: p53+/HLA-A*0201 patients were treated with ALT-801 on a schedule of four daily 15-minute intravenous infusions, then 10 days rest and four more daily infusions. Cohorts of patients were treated at 0.015, 0.040, and 0.080 mg/kg/dose.

Results: Four, 16, and 6 patients were treated at the 0.015, 0.04, and 0.08 mg/kg cohorts, respectively. Two dose-limiting toxicities (a grade 4 transient thrombocytopenia and a myocardial infarction) in the 0.08 mg/kg cohort established the maximum tolerated dose (MTD) at 0.04 mg/kg. Patients treated at the MTD experienced toxicities similar to those associated with high-dose IL-2 but of lesser severity. The serum half-life of ALT-801 was 4 hours and ALT-801 serum recovery was as expected based on the dose administered. ALT-801 treatment induced an increase of serum IFN-γ but not TNF-α. Response assessment showed 10 subjects with stable disease at at least 11 weeks, and in one who had melanoma metastasis, there is an ongoing complete absence of identifiable disease after resection of radiographically identified lesions.

Conclusion: This first-in-man study defines an ALT-801 regimen that can be administered safely and is associated with immunologic changes of potential antitumor relevance.

Trial registration: NCT00496860.

Publication types

  • Clinical Trial, Phase I
  • Research Support, N.I.H., Extramural

MeSH terms

  • Adult
  • Aged
  • Dose-Response Relationship, Drug
  • Drug Administration Schedule
  • Epitopes / immunology
  • Female
  • Fever / chemically induced
  • HLA-A2 Antigen / immunology
  • Humans
  • Infusions, Intravenous
  • Interferon-gamma / immunology
  • Interferon-gamma / metabolism
  • Interleukin-2 / adverse effects
  • Interleukin-2 / genetics
  • Interleukin-2 / immunology*
  • Interleukin-2 / pharmacokinetics
  • Interleukin-2 / therapeutic use
  • Leukocytes, Mononuclear / drug effects
  • Leukocytes, Mononuclear / immunology
  • Leukocytes, Mononuclear / metabolism
  • Lymphocyte Count
  • Lymphocytes / drug effects
  • Lymphocytes / immunology
  • Lymphocytes / metabolism
  • Male
  • Metabolic Clearance Rate
  • Middle Aged
  • Neoplasms / drug therapy*
  • Neoplasms / immunology
  • Neoplasms / metabolism
  • Prospective Studies
  • Receptors, Antigen, T-Cell / genetics
  • Receptors, Antigen, T-Cell / immunology*
  • Receptors, Antigen, T-Cell / therapeutic use
  • Recombinant Fusion Proteins / adverse effects
  • Recombinant Fusion Proteins / immunology
  • Recombinant Fusion Proteins / pharmacokinetics
  • Recombinant Fusion Proteins / therapeutic use*
  • Thrombocytopenia / chemically induced
  • Treatment Outcome
  • Tumor Suppressor Protein p53 / immunology


  • ALT-801
  • Epitopes
  • HLA-A*02:01 antigen
  • HLA-A2 Antigen
  • Interleukin-2
  • Receptors, Antigen, T-Cell
  • Recombinant Fusion Proteins
  • Tumor Suppressor Protein p53
  • Interferon-gamma

Associated data