“At a time when PD-1 inhibitors are dominating the immunotherapy field, a team of researchers is seeking to use groundbreaking CRISPR gene editing technology for the first time in human beings to create an engineered T-cell agent that would knock out the gene that controls the immune checkpoint’s activity.
“Plans for the complex therapy call for taking NY-ESO-1, a peptide-based form of adoptive immunotherapy already in clinical trials, and disrupting the activity of the PDCD1 gene that encodes PD-1 as well as the endogenous TRAC and TRBC genes, which control T-cell receptor (TCR) alpha and beta, respectively.
“The goal would be to enhance the immune response with NY-ESO-1 by eliminating genomic drivers that hamper T-cell proliferation and function, University of Pennsylvania (UPenn) researchers said in describing the proposed study before a National Institutes of Health (NIH) panel on June 21.”
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Chimeric antigen receptor (CAR) T-cell therapy is a new, immune system-based cancer treatment that has garnered recent media attention. In a clinical trial, CAR T-cell treatment left no signs of tumors in 70% to 90% of children and adults with the aggressive blood cancer acute lymphocytic leukemia (ALL). ALL is almost always fatal, and the results observed with CAR T-cell treatment are nothing short of spectacular. Continue reading…
“Kite Pharma, Inc, announced that the U.S. Food and Drug Administration (FDA) Office of Orphan Products Development granted orphan drug designation for the company’s lead investigational therapy, an autologous engineered T-cell product that targets CD19 expression on B-cell malignancies, for the treatment of diffuse large B-cell lymphoma.
“Orphan drug designation is granted by the FDA Office of Orphan Products Development to novel drugs and biologics which are defined as those intended for the safe and effective treatment, diagnosis or prevention of rare diseases/disorders that affect fewer than 200,000 people in the United States. The orphan drug designation also would entitle Kite Pharma to a 7-year period of marketing exclusivity in the United States.”
Editor’s note: When a newly developed drug for a rare (“orphan”) disease seems particularly promising for patients, the FDA may choose to grant it “orphan drug designation.” The designation removes certain barriers that might otherwise keep a drug company from being able to successfully develop and profit from an orphan drug. A new treatment for diffuse large B-cell lymphoma has now been granted orphan drug designation.
“Scientists at the Department of Haematology and Oncology at the Nagoya Daini Red Cross Hospital in Japan have concluded that a drug called Zolinza (vorinostat) may improve outcomes for patients fighting indolent B-cell lymphomas like follicular lymphoma and mantle cell lymphoma.”
Curti BD, Kovacsovics-Bankowski M, Morris N, Walker E, et al. Cancer Res. Oct 31, 2013.
“OX40 is a potent co-stimulatory receptor that can potentiate T cell receptor signaling on the surface of T lymphocytes, leading to their activation by a specifically recognized antigen. In particular, OX40 engagement by ligands present on dendritic cells dramatically increases the proliferation, effector function and survival of T cells. Preclinical studies have shown that OX40 agonists increase anti-tumor immunity and improve tumor-free survival. In this study, we performed a Phase I clinical trial using a mouse monoclonal antibody (mAb) that agonizes human OX40 signaling in patients with advanced cancer. Patients treated with one course of the anti-OX40 mAb showed an acceptable toxicity profile and regression of at least one metastatic lesion in 12/30 patients. Mechanistically, this treatment increased T and B cell responses to reporter antigen immunizations, led to preferential upregulation of OX40 on CD4+ FoxP3+ regulatory T cells in tumor-infiltrating lymphocytes andincreased the anti-tumor reactivity of T and B cells in patients with melanoma. Our findings clinically validate OX40 as a potent immune-stimulating target for treatment in cancer patients, providing a generalizable tool to favorably influence the antitumor properties of circulating T cells, B cells and intratumoral regulatory T cells.”
Erin Youngerberg was diagnosed with melanoma in October, 2010, at age 32 years. Well-traveled and an avid photographer, she grew up in Minnesota, went to college and worked in Milwaukee, then made her way east, living in Ohio and North Carolina before ending up in Jersey City, just outside of New York City. After her diagnosis, she started a blog to keep folks back home updated. Called ‘Melanoma and the City,’ it tells the whole story: from appointments at Memorial Sloan-Kettering Cancer Center (MSKCC) in New York City to various city adventures; from treatment side effects to recipes for quinoa and tacos. Erin has also found herself dedicated to spreading the word about melanoma awareness. We asked her to take us through her melanoma story.Continue reading…
Ibarrondo FJ, Yang OO, Chodon T, Avramis E, et al. PLoS One. Oct 22, 2013.
“A significant barrier to effective immune clearance of cancer is loss of antitumor cytotoxic T cell activity. Antibodies to block pro-apoptotic/downmodulatory signals to T cells are currently being tested. Because invariant natural killer T cells (iNKT) can regulate the balance of Th1/Th2 cellular immune responses, we characterized the frequencies of circulating iNKT cell subsets in 21 patients with melanoma who received the anti-CTLA4 monoclonal antibody tremelimumab alone and 8 patients who received the antibody in combination with MART-126-35 peptide-pulsed dendritic cells (MART-1/DC). Blood T cell phenotypes and functionality were characterized by flow cytometry before and after treatment. iNKT cells exhibited the central memory phenotype and showed polyfunctional cytokine production. In the combination treatment group, high frequencies of pro-inflammatory Th1 iNKT CD8(+) cells correlated with positive clinical responses. These results indicate that iNKT cells play a critical role in regulating effective antitumor T cell activity.”
Klug F, Prakash H, Huber PE, Seibel T, et al. Cancer Cell. Oct 24, 2013.
“Inefficient T cell migration is a major limitation of cancer immunotherapy. Targeted activation of the tumor microenvironment may overcome this barrier. We demonstrate that neoadjuvant local low-dose gamma irradiation (LDI) causes normalization of aberrant vasculature and efficient recruitment of tumor-specific T cells in human pancreatic carcinomas and T-cell-mediated tumor rejection and prolonged survival in otherwise immune refractory spontaneous and xenotransplant mouse tumor models. LDI (local or pre-adoptive-transfer) programs the differentiation of iNOS+ M1 macrophages that orchestrate CTL recruitment into and killing within solid tumors through iNOS by inducing endothelial activation and the expression of TH1 chemokines and by suppressing the production of angiogenic, immunosuppressive, and tumor growth factors.”
Kwong MLM, Neyns B, Yang JC, et al. Clinical Cancer Research. Oct 1, 2013.
“The clinical strengths of immunotherapy and small-molecule inhibitors targeting the mitogen-activated protein kinase (MAPK) pathway appear to be largely complementary for the treatment of advanced melanoma. In current practice, most patients with BRAF V600 mutant melanomas will see both modalities. Several in vitro and in vivo studies suggest that combining immunotherapy with MAPK inhibition may have synergistic effects. First, mouse models show that adoptive cell therapy (ACT) can be enhanced by vaccination. Rapid tumor destruction by vemurafenib could provide a vaccine-like stimulus to adoptively transferred T cells. Second, both in mice and in early clinical trials, melanoma metastases treated with MAPK inhibitors seem to display increased T-cell infiltrates. Third, MAPK inhibition upregulates the expression of some melanoma antigens and, therefore, may enhance T-cell recognition of vemurafenib-treated melanomas. Fourth, vemurafenib may sensitize tumor cells to immune destruction. Finally, some investigators have found that an optimal antitumor effect from MAPK inhibition is dependent on an intact host immune response. Currently, the Surgery Branch of the National Cancer Institute has initiated a phase II trial combining the BRAF inhibitor vemurafenib with ACT using tumor-infiltrating lymphocytes in patients with BRAF-mutant tumors to investigate the safety and efficacy of this combination. The proposed mechanisms for synergy between these two modalities can be complex, and their optimal combination may require testing a variety of sequences and schedules.”