Cancer-Testis Antigens in Canine Histiocytic Sarcoma and Other Malignancies (original) (raw)
Cancer/testis antigens and urological malignancies
Nature Reviews Urology, 2012
Cancer/testis antigens (CTAs) are a group of tumour-associated antigens (TAAs) that display normal expression in the adult testis-an immune-privileged organ-but aberrant expression in several types of cancers, particularly in advanced cancers with stem cell-like characteristics. There has been an explosion in CTA-based research since CTAs were first identified in 1991 and MAGE-1 was shown to elicit an autologous cytotoxic T-lymphocyte (CTL) response in a patient with melanoma. The resulting data have not only highlighted a role for CTAs in tumorigenesis, but have also underscored the translational potential of these antigens for detecting and treating many types of cancers. Studies that have investigated the use of CTAs for the clinical management of urological malignancies indicate that these TAAs have potential roles as novel biomarkers, with increased specificity and sensitivity compared to those currently used in the clinic, and therapeutic targets for cancer immunotherapy. Increasing evidence supports the utilization of these promising tools for urological indications.
Cancer-testis antigens: potential targets for cancer immunotherapy
Archives of Iranian medicine, 2009
Cancer-testis antigens are tumor antigens that their expression is almost limited to male germ cells in the testis. Some of cancer-testis antigens are also expressed in the ovary and in trophoblasts. Recently their expression has been seen in different types of tumors. Many pathophysiologic studies suggest that a blood-testis barrier exists in the testis. Because spermatogenesis begins at puberty, new cell-surface antigens are expressed when the immune system has refined the ability to distinguish self from nonself. So, sperms in the testis do not stimulate immune responses. In addition, although antigen-presenting cells are commonly seen in the interstitial spaces of the testis, these cells are scarcely seen within the seminiferous tubules. So, testis is considered as an immune-privileged site, and testis-specific genes, if expressed in cancers can be immunogenic. For this reason cancer-testis antigens are promising candidates for cancer immunotherapy and have become a major focus ...
Cancer-testis antigens: potential targets for cancer immunotherapy. Arch Iran Med
Archives of Iranian medicine
Cancer-testis antigens are tumor antigens that their expression is almost limited to male germ cells in the testis. Some of cancer-testis antigens are also expressed in the ovary and in trophoblasts. Recently their expression has been seen in different types of tumors. Many pathophysiologic studies suggest that a blood-testis barrier exists in the testis. Because spermatogenesis begins at puberty, new cell-surface antigens are expressed when the immune system has refined the ability to distinguish self from nonself. So, sperms in the testis do not stimulate immune responses. In addition, although antigen-presenting cells are commonly seen in the interstitial spaces of the testis, these cells are scarcely seen within the seminiferous tubules. So, testis is considered as an immune-privileged site, and testis-specific genes, if expressed in cancers can be immunogenic. For this reason cancer-testis antigens are promising candidates for cancer immunotherapy and have become a major focus for the development of vaccine-based clinical trials in recent years. In addition, these antigens can also be used as biomarkers for early detection of cancers.
Proceedings of the National Academy of Sciences, 2006
Cancer͞testis (CT) antigens are immunogenic proteins expressed in normal gametogenic tissues and in different types of tumors. CT antigens are promising candidates for cancer immunotherapy, and the identification of novel CT antigens is a prerequisite for the development of cancer vaccines. We have identified a CT antigen, named CTSP-1, with partial similarity to the breast differentiation antigen NY-BR-1. CTSP-1 presents several splicing and polyadenylation variants and has a very restricted expression pattern among normal tissues. CTSP-1 is exclusively expressed in normal testis and is aberrantly expressed in 47.6% (10 of 21) of tumor cell lines and in 44.4% (75 of 169) of tumors from different histological types. The highest percentages of positive expression were observed in melanomas (59.0%) followed by prostate (58.0%) and lung (57.0%) tumors. CTSP-1 is part of a highly conserved gene family, and members of this family also have a restricted expression pattern and similar protein structure. Antibodies against members of this gene family were detected in 10% (14 of 141) of plasma samples from patients with a wide spectrum of tumors. The highest percentages of antibody response were observed in patients with prostate (20.8%), thyroid (20.0%), and breast (16.6%) tumors. Because of its very restricted expression pattern in normal tissues and immunogenicity in different types of tumors, CTSP-1 should be considered a promising candidate for cancer immunotherapy.
Cancer testis antigens: A new paradigm for cancer therapy
2012
Cancer is the leading cause of death in economically developed countries and the second leading cause of death in developing countries. 1 The clinical management of cancer encompasses various aspects, including prevention, detection and treatment. Most cancers become clinically manifest only when they have already invaded the surrounding tissues or have metastasized. At this stage, the therapeutic options are limited, include aggressive chemotherapy (e.g., with cytotoxic agents such as paclitaxel), hormonal therapy (e.g., with tamoxifen), targeted therapy (e.g., imatinib) and immunotherapy. Cancer immunotherapy has an edge over other classical treatment modalities in that it is less prone than conventional drugs to severe side effects. Cancer immunotherapy is a highlytargeted approach and encompasses any strategy that directs the components of the innate and adaptive immune system against cancer. Cancer immunotherapy can provide durable clinical responses even against the most challenging cancers. Nonetheless the translation of immunological knowledge "from bench to bedside" has been limited due to the poor availability of ideal candidate targets on cancer cells. In this regard, a unique class of antigens known as cancer testis (CT)
Renal Cell Carcinoma: A Cancer-testis Antigen Poor Malignancy
Asian Pacific Journal of Cancer Biology
Renal cell carcinoma (RCC) is a relatively frequent cancer with increasing incidence in some regions. There is a need for early diagnosis of this cancer as a significant number of patients develop metastasis in their clinical course. Cancer-testis antigens (CTAs) are a group of tumor associated antigens whose expression has been assessed in a wide range of malignancies. CTAs are also considered as immunotherapy targets. Considering the relative responsiveness of RCC patients to immunotherapy, expression analysis of CTAs in RCC is of clinical importance. However, data regarding expression of CTAs in RCC is scarce except for a few numbers of CTAs including NY-ESO-1. The expression pattern of CTAs in RCC samples and cell lines is reviewed in this manuscript.
Inducible expression of cancer-testis antigens in human prostate cancer
Oncotarget, 2016
Immune tolerance to self-antigens can limit robust anti-tumor immune responses in the use of tumor vaccines. Expression of novel tumor associated antigens can improve immune recognition and lysis of tumor cells. The cancer-testis antigen (CTA) family of proteins has been hypothesized to be an ideal class of antigens due to tumorrestricted expression, a subset of which have been found to induce antibody responses in patients with prostate disease. We demonstrate that CTA expression is highly inducible in five different Prostate Cancer (PC) cell lines using a hypomethylating agent 5-Aza-2′-deoxycytidine (5AZA) and/or a histone deacetylase inhibitor LBH589. These CTAs include NY-ESO1, multiple members of the MAGE and SSX families and NY-SAR35. A subset of CTAs is synergistically induced by the combination of 5AZA and LBH589. We developed an ex vivo organ culture using human PC biopsies for ex vivo drug treatments to evaluate these agents in clinical samples. These assays found significant induction of SSX2 in 9/9 distinct patient samples and NY-SAR35 in 7/9 samples. Further, we identify expression of SSX2 in circulating tumor cells (CTC) from patients with advanced PC. These results indicate that epigenetic modifying agents can induce expression of a broad range of neoantigens in human PC and may serve as a useful adjunctive therapy with novel tumor vaccines and checkpoint inhibitors.
Cancer/testis antigens expression during cultivation of melanoma and soft tissue sarcoma cells
Clinical Sarcoma Research, 2020
Background Autologous dendritic cells (DC) loaded with tumor-associated antigens (TAAs) are a promising approach for anticancer immunotherapy. Polyantigen lysates appear to be an excellent source of TAAs for loading onto the patient’s dendritic cells. Cancer/testis antigens (CTA) are expressed by a wide range of tumors, but are minimally expressed on normal tissues, and could serve as a universal target for immunotherapy. However, CTA expression levels can vary significantly in patients with the same tumor type. We proposed that patients who do not respond to DC-based therapy may have distinct features of the CTA expression profile on tumor cells. Patients and methods We compared the gene expression of the principal families CTA in 22 melanoma and 27 soft tissue and bone sarcomas cell lines (STBS), received from patients and used for DC vaccine preparation. Results The majority (47 of 49, 95.9%) cell lines showed CTA gene activity. The incidence of gene expression of GAGE, NYESO1, M...
Cancer/testis antigens for therapeutic use
Journal of B.U.ON. : official journal of the Balkan Union of Oncology, 2009
Since van der Bruggen and colleagues first identified specific human tumour-associated antigens of the MAGE family, numerous potential immunotherapeutic targets have been discovered, often belonging to the so-called cancer/ testis gene family. Several members of this group have been described as immunogenic and have been utilised in clinical trials. In a search for interesting targets within this family, our laboratory has focussed its works for a number of years on two novel cancer/testis antigens called T21 and HAGE. In this article, we will focus our discussion on their levels of expression in a wide variety of both normal and cancer tissues, their possible role in tumour cell development and proliferation, and their immunogenic potential.