Such data, while limited, were encouraging and served as the foundation for a multicenter randomized double blind placebo control phase III trial in patients with unresectable stage III disease (START trial)

Such data, while limited, were encouraging and served as the foundation for a multicenter randomized double blind placebo control phase III trial in patients with unresectable stage III disease (START trial). MAGE-3 (melanoma associated antigen E-3) is a commonly expressed cancer testis antigen that is not present in normal adult tissue K145 hydrochloride but is expressed on multiple malignancies including NSCLC(54). C), as well as Burkitts Lymphoma (Epstein Barr Virus)(6)-(8). While such data maybe understandable in light of the defined role that the immune system plays in elimination of oncogenic viruses, large population based studies of solid organ transplant recipients also demonstrate an increase in multiple types of malignancies with no known viral etiology, such as malignant melanoma, renal cell carcinoma and non-Burkitts lymphoma(9),(10). Such experiments of nature form the basis for the theory of cancer immunosurveillance, which proposes that a healthy immune system can protect an individual K145 hydrochloride from the development and uncontrolled growth of malignancies(11). The theory of cancer immunoediting furthers the immunosurveillance theory and suggests that the immune system can both control the growth as well as shape the phenotype of cancer. It is thus possible that once a clinically evident tumor develops in an immunocompetent individual it has been sculpted to avoid immunorecognition, akin to bacterial drug resistance that develops in those treated with long-term antibiotics(12). Many studies in small animals with genetically engineered immune defects support observational human data and provide an experimental platform for studying the role of the tumor immune response. Unfortunately few human or animal studies have focused on the role of the immune system in surveillance for lung cancer. Such lack of data leads to controversy in this field. A recently published European study of immunosuppressed patients demonstrated no increase in lung cancer in kidney or liver transplant recipients but an increase in those receiving a heart allograft(13). Based on this data it is possible to conclude that in the population as a whole immunosurveillance for lung cancer may not occur. K145 hydrochloride Alternatively one could conceive that differences in cancer incidence may be unmasked only in patients with a significant smoking history, such as those requiring heart transplantation for coronary artery disease. Other observational studies, however, do not demonstrate an increase in lung cancer in heart transplant recipients, despite an increase in other cancers such as malignant melanoma and cervical carcinoma(14). Similar controversy exists in small animal models of lung cancer. Kobayashi and colleagues, for example, demonstrated that the incidence of chemically induced lung cancer is similar in immunocompetent and T cell deficient littermates while other investigators, using similar methodology, have demonstrated the importance of T cells in immunosurveillance for fibrosarcoma(15)-(17). Based on these and other data one must conclude the living of immunosurveillance for lung malignancy is not rigorously supported by medical or animal data. Therefore, unlike medical trials of immune centered therapy for melanoma and renal cell carcinoma, the rationale for immunotherapy in the treatment of lung malignancy deserves more background XCL1 investigation. Since lung malignancy, especially non small cell lung malignancy (NSCLC), is the leading form of malignancy related death(18),(19), funding and execution of such tests is definitely a critical priority to our field. == History of tumor immunotherapy == K145 hydrochloride The 1st organized tests of immunotherapy can be rightfully credited to a New York Doctor William Coley, whose line of medical research began in the 1890s with an anecdotal observation the facial sarcoma of a German K145 hydrochloride immigrant, Fred Stein, miraculously regressed after a post-operative bacterial infection. This event initiated Coleys medical study as he started to infect malignancy patients with numerous bacterial isolates(20). Coleys findings led to the creation of Coley’s toxin, a concoction derived from ethnicities of Streptoccocus pyogens and Serratia marcasens(21). Only in the 1990s was it defined the anti-tumor effects of these bacterial toxins were the result of tumor necrosis element produced by recipient macrophages.