Corticosteroids may play a useful role in cancer treatment. Since they are strongly anti-inflammatory they are sometimes prescribed to reduce swelling and pain. They may be used with other drugs to reduce nausea and vomiting created by chemotherapy treatment. They may also increase appetite. In a few types of cancer, specific corticosteroids are sometimes used with or without chemotherapy drugs to destroy cancer cells. It's important to note that while corticosteroids can be an important aspect of treatment in some types of cancer, they may not be helpful in all types.
Studies on corticosteroids tend to lean toward the extreme use, rather than the average use. For example, some studies look at corticosteroids for extreme and rarer cases of eczema. This makes it harder to research what long-term studies are out there on steroid use. To complicate things further, corticosteroids can be oral, topical, injected, or inhaled, and this dramatically changes the benefits and risks, and in turn the short-term and long-term effects. Speak with your doctor and pharmacist on what, if any, long-term studies out there are relevant to your own medical treatment.