Cancer Clinical Trial
Official title:
Study of Mechanisms of Anti COVID-19 Humoral and Cellular Immune Response Between 1 and 3 Months After Vaccination in a Sample of Patients and Salaried Staff From a French Anti-cancer Center
Special populations are people with a risk to dévelop severe forms of a disease. The immunogenicity and efficacy of vaccines in this population may be different compared of the general population. For Covid-19, special populations are people with chronic diseases (obesity, diabetes, cancer, etc.) and / or immunocompromised and / or elderly. It is therefore important that the safety of new vaccines as well as their efficacy be evaluated. Thus, in cancer, most immunosuppressions and immunosuppressive treatments (in particular chemotherapy or certain targeted therapies) risk negatively impacting the effectiveness of the anti-SARS-COV-2 vaccine both for the humoral immune responses (antibodies ) and cellular (T lymphocytes). These patients may develop an insufficient post-vaccination immunity. However, it seems that immunosenescence (ie the aging of the immune system) has little impact on the effectiveness of mRNA vaccines and viral vector vaccines. The Canserovax study evaluates the impact of anticancer treatments on the quality of the humoral (development of antibodies) and cellular (development of a specific T response) immune response to SARS-CoV-2 in patients treated for cancer after vaccination. It is carried out in patients undergoing treatment and in subjects not suffering from cancer, and not treated for this pathology (vaccinated salaried staff of a french cancer center). The aim is to qualitatively and quantitatively compare the post-vaccination immune responses in these 2 populations.
The main objective of this study is to describe after anti-SARS-CoV-2 vaccination the humoral immune response against the virus (assay of anti-SARS-CoV-2 antibodies to detect the presence and intensity of humoral immune responses) and the cellular response against the virus (specific T response). Several cohorts are studied: - Cohort 1 of vaccinated salaried staff (First group : Employees vaccinated with two doses of vaccine (2 Pfizer doses or 2 Astra doses or 1 Pfizer dose + 1 Astra dose) and never infected with SARS-CoV-2) and second group (Employees vaccinated with one dose of Pfizer or Astra vaccine and previously infected with SARS-CoV-2) - Cohort 2 of unvaccinated salaried staff (controls) - Cohort 3 of vaccinated cancer patients (metastatic colorectal, metastatic pancreas and metastatic breast cancer) ;
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