According to National Cancer Institute (US) scientists"Weak associations (with Non-Hodgkin's Lymphoma or NHL) have been noted for some common (medical) conditions... like asthmaallergiesrheumatoid arthritisrheumatic fevertuberculosis and infectious mononucleosisand commonly taken steroidal drugs. Some conditions that warrant further investigation include asthma and steroid use.'

Steroids are known to be immunosuppressive; asthma too is an immune system disorder. Asthma