Real-World Clinical Outcomes in Adult Patients Who Initiate Systemic Treatment for Relapsed or Refractory Follicular Lymphoma

Primary Objective: To evaluate objective response rate (ORR) in adult patients with relapsed/refractory follicular lymphoma (r/r FL) grade 1-3a who are treated with currently available therapies in the real-world setting according to Lugano classification (Cheson, 2014) of malignant lymphoma and as assessed by independent central review. Secondary Objectives: To evaluate the following outcomes in adult patients with r/r FL grade 1-3a who are treated with currently available systemic therapies in the real-world setting: 1. Objective response rate (ORR) according to the Lugano classification and as assessed by treating physician evaluation 2. Complete response (CR) rate according to the Lugano classification and as assessed by: * Independent central review, and * Treating physician evaluation 3. Progression-free survival (PFS) according to the Lugano classification and as assessed by: * Independent central review, and * Treating physician evaluation 4. Overall survival (OS) 5. Duration of response (DOR) according to the Lugano classification and as assessed by: * Independent central review, and * Treating physician evaluation 6. Disease control rate (DCR) according to the Lugano classification and as assessed by: * Independent central review, and * Treating physician evaluation 7. Time to next treatment (TTNT) 8. Histological transformation (HT)