A Study to Learn More About Copanlisib Treatment Patterns in People With Indolent Non-Hodgkin Lymphoma, a Type of Cancer That Grows and Spread Slowly and Develops in the Lymphatic System (a Part of Immune System) in Taiwan Under Real-word Conditions

This is an observational study, in which data from Taiwanese people with indolent non-Hodgkin lymphoma who will be receiving copanlisib is studied. Indolent non-Hodgkin lymphoma (iNHL) is a type of cancer that grows and spread slowly and begins in the lymphatic system, which is a part of body's immune system, and affects a type of white blood cells called lymphocytes of. In iNHL, white blood cells grow abnormally and can form growths (tumors) throughout the body. iNHL tends to come back after treatment (relapse) and may stop to respond to medical treatment (become refractory). While the disease is typically slow growing, it can become more aggressive over time. iNHL consists of multiple subtypes and it is already known to the researchers that Taiwanese people often have a different subtype of iNHL and poorer survival than people in most Western countries. Moreover, there is little information about how well the drug copanlisib works in Asian people with iNHL. The study drug copanlisib works by blocking PI3K proteins and preventing cancer cells from growing and surviving. Copanlisib is already available in US and in Taiwan and is approved for doctors to prescribe to patients. The National Authority for Health in Taiwan granted an accelerated approval of copanlisib due to the new mechanism of action of this drug and based on the results of a previous study, in which participants with iNHL received treatment with copanlisib. This previous study, however, included only a small number of Asian people and no Taiwanese people at all. The main purpose of this study is to learn more about treatment patterns of copanlisib from Taiwanese people who have decided with their doctor to start copanlisib for iNHL. To do this, researchers will collect the following data: * administered doses of copanlisib * dates of treatment administration * how long copanlisib treatment was given * the number of treatment periods also called cycles (one cycle is defined as 3 intravenous treat