Evaluation of antibody response against SARS-CoV-2 vaccination in patients treated with IO-treatment, in comparison with antibody titers in patients treated with non-IO treatment.

Blood samples will be analyzed to determine the magnitude of SARS-CoV-2 immunity in cancer patients treated with immunotherapy by quantifying antibodies and other tumor or blood-based biomarkers against SARS-CoV-2 epitopes following vaccination. We will also explore for potential development of autoantibodies and other blood-based biomarkers, following SARS-CoV-2 vaccination, and their correlation with clinical manifestation of IO related immune-related adverse events.

Inclusion Criteria:

1. Patients with solid malignancies treated with either IO or non-IO treatment.
2. All categories of IO treatment allowed (immune-checkpoint inhibitors, bi-specific T cell engagers, cytokine agonists and others), as well as all categories of non-IO treatment (such as chemotherapy and targeted therapies). These can be given as part of standard of care or within participation in a clinical trial.
3. Patients are allowed to have any of the approved vaccines in Canada, such as Pfizer, Moderna, AstraZeneca or their approved combinations.
4. Patients must receive all appropriate doses of SARS-CoV-2 vaccination, as dictated by the respective vaccine schedules.

Exclusion Criteria:

• None

Patients with solid malignancies treated with either immunotherapy or non-immunotherapy treatment who have received the SARS-CoV-2 vaccination.