Recently, with the great progress of acute B CAR-T for recurrent lymphocytic leukemia, and the protection of T cells in vivo PD-1 monoclonal antibody in clinical trials have certain curative effect, has attracted many international well-known pharmaceutical companies on the capital market and to the field of cancer immunotherapy. People began to realize the immune therapy especially the adoptive transfer of immune cells has great prospects in the treatment of cancer. Although immunotherapy suddenly heat up, work in the field of scientists brought development opportunities for always; but on the other hand, we must remain sober minded, adoptive transfer of immune cells of the objective face in the clinical treatment of cancer challenge.The complexity of tumor immunotherapyThe treatment of solid tumors is a combination of surgery (including a variety of minimally invasive surgery), chemotherapy, radiotherapy, biological immunotherapy, traditional Chinese medicine, psychotherapy, nutrition and metabolism in one of the integrated treatment. In order to get the benefits of biological immunotherapy, we should first pay attention to the top-level design of the overall treatment plan for each patient's first visit. The choice of means of treatment of local lesions, immune therapy, time, how will the adoptive transfer of immune cells and targeting antibodies with the application, how to use chemotherapy or immunosuppressive antibody reduces factors (including Treg) have an impact on the efficacy of immunotherapy. According to our experience, the adoptive transfer of immune cells should begin in the perioperative period, through the postoperative course. In order to achieve long-term survival, we should continue to monitor the immune function, so as to strengthen immunization if necessary. Therefore, the adoptive transfer of immune cells is responsible for the implementation of the treatment of physicians, should have a complete understanding of all aspects of the comprehensive treatment of the tumor, and to propose solutions for the specific circumstances of the patient.In the course of immune cell therapy, we found that the cells were prepared using a unified culture system, and the cells of each patient responded differently, including the number and phenotype. This is closely related to the factors such as the disease of the tumor, the staging of the disease, the combination of other viral infections, the treatment of other cells, the initial treatment of the immune cells or the subsequent treatment, as well as the psychological status and other factors. Therefore, on the one hand, we need to analyze and grasp from the clinical point of view, on the other hand, we need to adjust the cell culture conditions of different patients in the process of cell preparation.Targeting of tumor immune cell therapyThe solution of adoptive tumor immune cell transfer therapy targeting or specific problems mainly depends on the load of tumor antigen DC in vivo or in vitro induced induction and amplification of specific cytotoxic T cells (CTL), directly from the tumor infiltrating lymphocytes (TIL) or draining lymph node lymphocytes (TDLN) was CTL the construction of CAR-T, and T cell receptor engineered T cell gene engineering technology (TCRT). The treatment of acute B lymphocytic leukemia relapse obtained complete remission rate was 90%, the treatment of chronic B lymphocytic leukemia also obtained complete remission rate was 87%, which shows that the modified CAR-T has a strong and persistent tumor killing effect. However, the molecular markers of CD19 and CD20 are the surface markers of human normal B lymphocytes. This means that the goal of the treatment is to remove all B cells in the blood, even in the bone marrow, including lymphoma cells. The substance of the treatment is equivalent to that of the pulp. Of course, the important physiological functions of B lymphocytes can be partially replaced by exogenous supplementary immunoglobulin for a long time. However, for solid tumors, they lack specific targets with universal significance. Some of the related antigen epitopes found in solid tumor cells are different from normal cells. The CAR-T has a low expression level of target normal tissue cells attack will have a "Miss" effect, the side effect is very serious. Of particular note is a highly heterogeneous solid tumor cells (including different dry or different degree of differentiation of tumor cells, tumor growth may support the alienation of mesenchymal cells and vascular endothelial cells), biological characteristics, genetic changes in the immune pressure self modulation, the treatment of anti single target in clinical on a wide range of difficult work. Therefore, the author thinks that: 1) from the source specific immune antigen presenting cells (such as DC) breakthrough, break the immune tolerance and immune surveillance function returned to normal and the precise start and activation of autologous T cells, is still an integral part of anti tumor immunotherapy. 2) the combination therapy of non potent multi-target tumor associated antigen specific T cells may be safer and more effective. 3. It is important to develop a DC vaccine targeting the cancer stem / progenitor cells or to induce and amplify the target CTL.
Persistence of tumor immunotherapy
Studies have shown that both in vivo and in vitro can induce the individual CTL, but there is a problem of how to improve the survival of CTL in vivo, which is a long-term role in vivo. Once the tumor is constructed in a suitable microenvironment for its growth, it will release a series of inhibitory factors, prevent T cells from entering the tumor region or induce T cell apoptosis. Studies have shown that blockade of CO inhibitory pathway molecules (PD-1 and PDL-1, CTLA4) and / or activation of costimulatory molecules (4-1BB, D28, OX4) and so on, help to improve the survival and function of CTL in vivo. Although the anti CTLA-4 antibody is known to have a positive effect on immune suppression, the side effects are very obvious. Clinical trials of anti PD-1 antibody showed a certain effect, but the effectiveness of most of the initial test is still relatively low, and there is a big gap between clinical expectations. How will the treatment combination transfer PD-1 antibody and anti PDL-1 antibody and T cell adoptive, obtain better curative effect, the urgent need to carry out pre clinical and clinical trials. The research team is working on this aspect.
Other factors affecting the therapeutic effect of immune cells
The neuro immune endocrine system is a whole, and they interact and regulate each other. The effects of mental or psychological changes on immune system can be clearly observed in clinical treatment. A significant proportion of patients with cancer have depression or depression, can directly affect the effect of immunotherapy. Therefore, it is very important to improve the efficacy of immunotherapy. It is also important for clinicians to provide psychological counseling for tumor patients.
The effect of immune cell therapy also depends on the improvement of the systemic environment. Patients with cancer are often associated with other metabolic disorders, including lipid metabolic disorders, diabetes, and an imbalance in nutrient intake. Doctors are required to provide the necessary dietary and nutritional guidance. It is very important to improve the immune function of patients with advanced cancer or chemotherapy.
Traditional Chinese medicine believes that the human body is a highly developed ecological system which is closed and closely linked with the outside world. The body of any abnormal changes from the outside or inside, can be adjusted through their own ecological conditioning system, and ultimately achieve the balance of yin and Yang human needs. For cancer patients, Chinese medicine focuses on the human body rather than the tumor. Its goal is to promote the process of self adjustment and self harmony, and ultimately become a "flat" (yin and yang balance and harmony of people). Chinese medicine in the treatment process through the analysis of the appearance of disease function imbalance human nature, and then through the whole function of the adjustment, repair and stimulate the defensive system and self-healing system itself, the coexistence of state so that the resistance and pathogens themselves to live in peace. The neuro immune endocrine regulatory system is the embodiment of the overall concept of Western medicine, but also a bridge between traditional Chinese medicine and Western medicine. Adoptive transfer of immune cell therapy is the only western medicine has four major anticancer therapies in the overall consideration and "health" the efficacy of therapy. But due to the tumor patients with evil factors of poison, phlegm, dampness and stagnation of pathogenic factors, adoptive immune cells transferred to the human body, such as in these diseases do not get rid of, the overall environment does not improve, but also can not fully play a role and can not be sustained, unable to repair and reconstruction of its anti tumor immune function. The combination of Chinese medicine and immune cell technology, Chinese medicine can be obtained faster "health" effect, the comprehensive effect of Chinese medicine on multiple targets and effect on regulation of whole environment can strengthen the immune cell therapy. The two complement each other, may play a synergistic role in 1+1>2, and to restore the ability of anti tumor reconstruction patients themselves, improve life quality and prolong the survival in patients with malignant tumor, even tumor patients were cured.