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Purpose: Combination therapies targeting immunologic checkpoints have shown promise in treating multiple tumor types. We report safety and tolerability of MEDI0562, a humanized IgG1K OX40 mAb, in combination with durvalumab (anti-PD-L1), or tremelimumab (anti-CTLA-4), in adult patients with previously treated advanced solid tumors., Patients and Methods: In this phase I, multicenter, open-label study, patients received escalating doses of MEDI0562 (2.25, 7.5, or 22.5 mg) every 2 weeks in combination with durvalumab (1,500 mg) or tremelimumab (75 or 225 mg) every 4 weeks, intravenously, until unacceptable toxicity or progressive disease. Tumor assessments were performed every 8 weeks. The primary objective was to evaluate safety and tolerability., Results: Among the 27 and 31 patients who received MEDI0562 + durvalumab or MEDI0562 + tremelimumab, 74.1% and 67.7% reported a treatment-related adverse event (AE), and 22.2% and 19.4% experienced a treatment-emergent AE that led to discontinuation, respectively. The MTD of MEDI0562 + durvalumab was 7.5 mg MEDI0562 + 1,500 mg durvalumab; the maximum administered dose of MEDI0562 + tremelimumab was 22.5 mg MEDI0562 + 225 mg tremelimumab. Three patients in the MEDI0562 + durvalumab arm had a partial response. The mean percentage of Ki67+CD4+ and Ki67+CD8+ memory T cells increased by >100% following the first dose of MEDI0562 + durvalumab or tremelimumab in all dose cohorts. A decrease in OX40+FOXP3 regulatory T cells was observed in a subset of patients with available paired biopsies., Conclusions: Following dose escalation, moderate toxicity was observed in both treatment arms, with no clear efficacy signals demonstrated., (©2022 American Association for Cancer Research.)

The existence of tumor-specific T cells, as well as their ability to be primed in cancer patients, confirms that the immune response can be deployed to combat cancer. However, there are obstacles that must be overcome to convert the ineffective immune response commonly found in the tumor environment to one that leads to sustained destruction of tumor. Members of the tumor necrosis factor (TNF) superfamily direct diverse immune functions. OX40 and its ligand, OX40L, are key TNF members that augment T-cell expansion, cytokine production, and survival. OX40 signaling also controls regulatory T-cell differentiation and suppressive function. Studies over the past decade have demonstrated that OX40 agonists enhance antitumor immunity in preclinical models using immunogenic tumors; however, treatment of poorly immunogenic tumors has been less successful. Combining strategies that prime tumor-specific T cells together with OX40 signaling could generate and maintain a therapeutic antitumor immune response., (Copyright © 2010 Elsevier Inc. All rights reserved.)

Dendritic cells (DCs) initiate primary and stimulate secondary T-cell responses. We conducted a phase I trial of tumor necrosis factor (TNF-alpha) and granulocyte-macrophage colony-stimulating factor (GM-CSF) in patients with cancer to increase DCs in peripheral blood or skin based on in vitro data that showed that CD34(+) hematopoietic precursors require these cytokines to mature into functional antigen-presenting DCs. Eleven patients were treated for 7 days with GM-CSF, 125 microg/m(2) twice daily as subcutaneous injections, and TNF-alpha as a continuous infusion at dose levels of 25, 50, or 100 microg/m(2)/day. The maximum tolerated dose of TNF-alpha was 50 microg/m(2)/day with this dose of GM-CSF; dose-limiting toxicities occurred in both patients treated with 100 microg/m(2)/day. One became thrombocytopenic and the other had transient confusion. Epidermal Langerhans' cells were quantitated by S100 staining of skin biopsies and DC precursors in peripheral blood by colony-forming unit dendritic (CFU-dendritic) assays. S100-positive cells in the epidermis doubled after treatment (2.55 S100(+) cells/high-power field before treatment to 6.05 after treatment, p = 0.029). CFU-dendritic in peripheral blood increased after treatment in 3 colorectal cancer patients but not in 3 patients with melanoma. CD11c(+) or CD123(+), HLA-DR(bright), lineage-negative dendritic cell precursors were not increased in peripheral blood mononuclear cells. This trial demonstrates that treatment with TNF-alpha and GM-CSF can increase the number of DCs in the skin and the number of dendritic cell precursors in the blood of some patients with cancer. This approach may increase the efficacy of vaccination to tumor antigens in cancer patients.

This dose-escalation study was performed to evaluate the hematologic activity, biological effects, immunogenicity, and toxicity of PIXY321 (an interleukin-3/granulocyte-macrophage colony-stimulating factor fusion protein) administered after high-dose carboplatin (CBDCA) treatment. Patients with advanced cancers received CBDCA at 800 mg/m2 intravenously on day 0 of repeated 28-day cycles. In part A of the study, patients were treated with CBDCA alone during cycle 1 and then received PIXY321 on days 1 through 18 of cycle 2 and later cycles. In part B, patients received 18 days of PIXY321 beginning on day 1 of all CBDCA cycles, including cycle 1. PIXY321 was administered subcutaneously in 2 divided doses. Total doses of 135, 250, 500, 750, and 1,000 micrograms/m2/d were administered to successive cohorts of 3 to 6 patients in part A. In part B, patient groups received PIXY321 doses of 750, 1,000, and 1,250 micrograms/m2/d. The hematologic effects of PIXY321 were assessed in the first 2 cycles of therapy. Anti-PIXY321 antibody formation was assessed by enzyme-linked immunosorbent assay (ELISA) and neutralization assay. Of the 49 patients enrolled, 31 were fully evaluable for hematologic efficacy. When comparing the first B cycle (cycle B-1; with PIXY321) with the first A cycle (cycle A-1; without PIXY321), the fusion protein had no significant effect on platelet nadirs or duration of platelets less than 20,000/microL but was able to speed the time of recovery of platelet counts to 100,000/microL (15 v 20 days; P =.01). Significant improvements in neutrophil nadir and duration of ANC less than 500 were observed in cycles A-2 and B-1 (with PIXY321) as compared with cycle A-1 (without PIXY321). Initial PIXY321 prophylaxis (cycle A-2 and cycle B-1), enhanced the recovery of ANC to greater than 1,500/microL by an average of at least 8 days as compared with cycle A-1 (without PIXY321; P

The adoptive transfer of anti-CD3-stimulated T killer (T-AK) cells was tested with different bolus and infusional interleukin-2 (IL-2) regimens, and anti-CD3 stimulation procedures to determine immunologic and antitumor effects in patients with a variety of advanced cancers. Indium-111 labeling was used to observe traffic patterns of the infused T-AK. Autologous peripheral blood mononuclear cells were obtained by leukapheresis. Cyclophosphamide (300 mg/m2) was given to most patients immediately after leukapheresis. The harvested cells were activated ex vivo with anti-CD3 overnight or for 4 days, at which time cells were reinfused and an IL-2 regimen was begun. Treatment was repeated 28 days later. This treatment regimen induced significant increases in leukocytes, lymphocytes, and eosinophils in patients in most treatment cohorts. Circulating lymphocytes were predominantly CD3+ T cells with preferential expansion of the CD8+ subset. Patients receiving cells stimulated in vitro for 4 days had significant T-cell lymphocytosis with either infusional or bolus plus infusional IL-2 regimens. T-cell viability was decreased in culture after a second 4-day stimulation with anti-CD3 at day 28; this decrease could be prevented by adding IL-2 to the culture media. Cells stimulated overnight required both bolus and infusional IL-2 to show an atypical lymphocytosis in vivo. Overnight-stimulated T-AK did not show decreases in in vitro viability at the day 28 restimulation. Indium-III-labeled cells trafficked to the liver, spleen, and bone marrow. No increase in uptake was observed in tumor deposits. There were 2 patients with partial responses, 5 with minor responses, 19 with stable disease, and 88 with progressive disease. The length of in vitro anti-CD3 stimulation, and the dose and timing of IL-2 administration in vivo results in different circulating leukocyte populations after adoptive T-AK infusion. Generally, the CD8+ T-cell subset was preferentially expanded by this treatment approach. Repeated ex vivo stimulation with anti-CD3 may cause cell death.

Previous primate and rodent studies suggested that interleukin-1 alpha (IL-1 alpha) caused changes in the secretion of pituitary, adrenal, thyroid, and gonadal hormones, as well as acute-phase reactants. Plasma samples were obtained after IL-1 alpha and beta treatment in cancer patients to document the changes in endocrine function suggested by the animal models. Successive groups of patients were treated at IL-1 alpha doses of 0.01, 0.03, 0.1, 0.3, and 1.0 microgram/kg, given daily as a 15-min intravenous bolus. IL-1 beta was given at 0.1 microgram/kg by the same route and time course. After the first dose of IL-1, statistically significant elevations of a.m. and p.m. cortisol, growth hormone (GH), and prolactin (PRL) occurred. Thyroid-stimulating hormone (TSH) and C-reactive protein (CRP) were elevated by the sixth treatment day. Testosterone decreased significantly in male patients. Follicle-stimulating hormone (FSH) and luteinizing hormone (LH) were more variable but decreased in most patients. The changes in cortisol, GH, PRL, TSH, CRP, FSH, LH, and testosterone resolved after treatment and did not result in clinically apparent endocrinopathies. Bolus doses of IL-1 alpha and beta cause significant changes in many endocrine laboratory parameters and influence the in vivo activities of multiple homeostatic endocrine functions in human beings.

Interleukin-1 (IL-1) is a cytokine with many activities central to immune function and hematopoiesis. Many IL-1 properties can be potentially exploited in the treatment of malignancy. This review describes the toxicities and antitumor effects observed in Phase I and II trials of IL-1 in cancer patients. The immunophysiology and the induction of cytokines by IL-1 has been examined in many of the Phase I trials and has aided in understanding IL-1 effects in humans. The influence of IL-1 on granulopoiesis and thrombopoiesis when given by different regimes is also reviewed in detail.

Purpose: This study describes the physiologic and biologic effects resulting from the adoptive transfer of ex vivo anti-CD3-stimulated T-killer cells (T-AK) to patients with advanced cancer in combination with interleukin-2 (IL-2)., Methods: Autologous peripheral-blood mononuclear cells were obtained by leukapheresis and stimulated ex vivo with anti-CD3. The stimulated cells were reinfused at one of three dose levels on the next day (5 x 10(9), 7.5 x 10(9), and 1 x 10(10)). Cell administration was followed by IL-2 given by bolus and continuous infusion (1.5 x 10(6) U/m2 and 3.0 x 10(6) U/m2, respectively) for 7 days, or continuous infusion alone (3.0 x 10(6) U/m2) for 14 days., Results: Pronounced leukocytosis and atypical lymphocytosis were observed with individual values as high as 80,000 and 50,000 cells/microL, respectively. The other major clinical sequelae included a marked lactic acidosis with bicarbonate levels as low as 4.0 mmol/L in some patients, and prolongation of the prothrombin time (PT) and partial thromboplastin time (PTT) due to decreases in clotting factors VII, IX, and X. Antithrombin III levels were also reduced. Hypotension associated with increased serum nitrate and neopterin levels was observed. These toxicities were accompanied by increases in hepatocellular enzymes and creatinine previously described with IL-2. These events occurred at a time when the number of circulating T-AK cells reached their peak. The amount of bolus IL-2 correlated with increases in WBC count (P = .0311), atypical lymphocytes (P = .0241), PT (P = .0006), and PTT (P = .0122)., Conclusion: Substantial in vivo expansion of activated T lymphocytes was induced by a protocol combining ex vivo activation of peripheral-blood cells with anti-CD3 antibody followed by adoptive transfer and IL-2 administration. The synchronous expansion of these T cells superimposed on diminished liver and kidney function from IL-2 can cause profound but reversible metabolic changes.

Purpose: A phase I trial was undertaken because interleukin-1 alpha (IL-1 alpha) possesses antiproliferative, immunostimulatory, antiinfection, myeloprotective, and myelorestorative properties that could be beneficial in cancer treatment., Patients and Methods: In this phase I trial, IL-1 alpha was administered intravenously (IV) during a 15-minute period daily for 7 days to patients with advanced solid malignancies., Results: The maximum-tolerated dose (MTD) of IL-1 alpha alone was 0.3 microgram/kg. A second group of patients received indomethacin plus IL-1 alpha based on preclinical studies, which indicated that indomethacin could abrogate IL-1 alpha-induced hypotension; however, the MTD of IL-1 alpha plus indomethacin was 0.1 microgram/kg lower than IL-1 alpha alone. Fever, chills, headache, nausea, vomiting, and myalgia were common but were not dose-limiting. Hypotension resulted from a marked decrease in systemic vascular resistance and required pressors at 0.3 and 1.0 micrograms/kg IL-1 alpha. Dose-limiting toxicities included hypotension, myocardial infarction, confusion, severe abdominal pain, and renal insufficiency. IL-1 alpha treatment caused a significant, dose-related increase in the total WBC count (mainly segmented neutrophils and neutrophilic bands). Bone marrow cellularity increased because of enhanced numbers of relatively mature myeloid cells and megakaryocytes. Platelet counts decreased during therapy but were significantly elevated above baseline values 1 to 2 weeks posttreatment; this may have been an effect of IL-6 that was shown to be induced by IL-1 alpha treatment. Significant increases in triglycerides, cortisol, C-reactive protein, thyroid-stimulating hormone and decreases in cholesterol, testosterone, and protein-C were observed with treatment., Conclusion: We conclude that at doses of IL-1 alpha that can be given safely to cancer patients, significant, potentially beneficial hematopoietic effects occur.

Background: Toxicity to interleukin-2 (IL-2) tumor immunotherapy is manifested principally by the vascular leak syndrome, hypotension, and a hyperdynamic response with low systemic vascular resistance. Nitric oxide (.N = O), a recently discovered biological mediator of vascular smooth muscle relaxation, is produced in increased amounts by numerous cell types exposed to a number of inflammatory cytokines., Purpose: Our purpose was to determine if there is an increased production of .N = O in patients receiving IL-2 tumor immunotherapy, and, if so, whether increases in .N = O production correlate with hemodynamic instability., Methods: Twelve patients undergoing immunotherapy trials with IL-2 and anti-CD3 monoclonal antibody-activated lymphocytes (T-AK cells) were studied. Plasma levels of nitrate (NO3-), the stable end metabolic product of .N = O synthesis, were measured before and at the end of IL-2 treatment cycles., Results: We observed a ninefold increase in plasma levels of NO3- in patients after 7 days of treatment (P less than .0001). A significant decrease in both systolic and diastolic blood pressures was observed in all patients (P less than .001)., Conclusions: We propose that mediated induction of .N = O synthase enzyme leads to progressive increases in .N = O production which, in turn, produces clinically significant hypotension., Implications: Since .N = O synthesis can be competitively inhibited by L-arginine analogues, a possible pharmacologic modulation of .N = O production could potentially contribute to better management of toxic side effects seen in IL-2 cancer therapies.