BMC Immunology is delighted to announce the launch of a new thematic series: "Cancer Immunotherapy and Vaccines". Here, Guest Editor Francesco Pappalardo gives an introduction to the series and discusses the progress and the difficulties faced by researchers in the field.
Professor Francesco Pappalardo 31 May 2017
Pixabay
Vaccines are the most effective and cost-efficient weapons that can be used to prevent (preventive vaccines) or cure (therapeutic vaccines) diseases caused by infectious agents or cancer cells. Usually, when one thinks about the word vaccine, the first thought that comes into the mind is related to an artificial administration of a stimulus that instructs the immune system to fight against the cause of a particular pathological state (the pathogen). However, in the case of cancer vaccines, the main view, still unknown to the majority of the people not working in the field, is represented by the exploitation of the hosts immune system to treat or prevent cancer. The idea, however, dates back decades.
In the same way a traditional vaccine works, a cancer vaccine can promote the eradication of malignant cells during their initial transformation from safe to harmful cells. This eradication process, commonly referred to as immune surveillance of tumors [1], is carried out by the immune system and, most of the time, it happens without any external intervention. Tumors are the result of a particular combination of factors related to genetic and epigenetic changes that enable immortality.
In the same way a traditional vaccine works, a cancer vaccine can promote the eradication of malignant cells during their initial transformation from safe to harmful cells.
This is not a completely undetectable process: during the transformation of a normal cell into a malignant one, foreign antigens (neo-antigens or, to be more specific, onco-antigens) are created; these should render neoplastic cells visible by the immune system that can target them for elimination. Tumors cells, like every living organisms, want, nevertheless, to live. Hence, tumors try to become resistant and invisible to immune system attacks by developing multiple resistance mechanisms that include local immune evasion, induction of tolerance and systemic interference of T cell signaling. Besides, mimicking the metaphor of Darwins natural selection, immune recognition of cancer cells enforces a selective pressure on developing ones. This favors the development of less immunogenic and more apoptosis-resistant neoplastic cells, through a mechanism well known as immune editing [2].
Due to the fact that cancer cells are particularly good at evading any action from the immune system, most anti-cancer treatments are based on other means like surgery, radiation therapy, and chemotherapy. Nowadays, however, it is clear that the various arms of the immune system play an essential role in protecting humans from cancer. After unsatisfactory efforts and explicit clinical failures, the field of cancer immunotherapy has received a significant boost, thanks mainlyto the development in 2010of an autologous cellular immunotherapy, sipuleucel-T, for the treatment of prostate cancer [3] and the approval of the anti-cytotoxic T lymphocyte-associated protein 4 (CTLA-4) antibody ipilimumab (2011) andanti-programmed cell death protein 1 (PD1) antibodies (2014) for the treatment of melanoma [4]. These achievements haverenovated the field and brought attention to the opportunities that immunotherapeutic approaches can offer [5,6].
The field of cancer immunotherapy has recently received a significant boost
Pixabay
There are still, however, some difficulties to be overcome when developing effective immunotherapy strategies against cancer. The general lack of understanding of the mechanisms of immunization, the role of dendritic cells, the ability of cancer to induce tolerance, and the identification of the most suitable antigens to use are just some examples of how the development of effective strategies is still problematic [7-10]. There are several biotechnological methodologies, based on both in silico and in vivo techniques, that study and suggest possible candidates for use in immunotherapies. However, they are not able, on their own, to quantify and analyze the immune system response globally. Moreover, there are now several computational techniques to predict T cell epitopes (and,to some extent, also B cell epitopes) [11,12]. Computational simulations may help in solving these issues, but these need to be integrated with the in vitro and in silico molecular analyses [13,14]. So, a complete computational/biological pipeline that allow the best integration of in silico, in vitro and in vivo methodologies may potentially boost and improve cancer immunotherapy development and effectiveness.
The aim of the thematic series is to bring together the latest advances in both biological and computational research, looking broadly at the basic biological aspects of immunotherapy, emerging immunotherapies (both prophylactic and preventive) and different vaccination approaches. The novel, and, at the same time, established character of computation in immunology greatly improves and speeds-up the development of novel vaccination strategies, both therapeutic and preventive, against cancer. We welcome original research, methodology, software, and database article submissions.
The deadline for submission of manuscripts is 30thNovember2017. For more information, visit the BMC Immunology website.
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