This is a real-world, observational, prospective cohort study in patients with severe asthma recruited into the International Severe Asthma Registry (ISAR) and the US severe asthma registry (CHRONICLE) and followed-up for occurrence of new malignancies. The primary objective is to measure the incidence of malignancy in the overall severe asthma population as well as its relevant subgroups, including patients receiving benralizumab, patients receiving non-benralizumab biologics, and patients not receiving biologics. The secondary objective is to describe the clinical characteristics of new malignancy cases that develop in severe asthma patients and relevant subgroups.

Inclusion Criteria:

• The study population includes patients with severe asthma recruited into ISAR and CHRONICLE. Severe asthma patients are defined as those receiving treatment consistent with Global Initiative for Asthma (GINA) Step 5 or who are uncontrolled on GINA Step 4 treatment regimens.

Exclusion Criteria:

- Patients who are not willing and able to sign written informed consent

The study population includes patients with severe asthma recruited into ISAR and CHRONICLE. Severe asthma patients are defined as those receiving treatment consistent with Global Initiative for Asthma (GINA) Step 5 or who are uncontrolled on GINA Step 4 treatment regimens. The three main study groups are: severe asthma patients who receive benralizumab, who receive non-benralizumab biologics, and those who do not receive any biologics.