Colorectal cancer - due to the fact that it is one of the most common cancers - has attracted the interest of many scientists. Attempts are constantly being made to improve diagnostic methods as well as treatment regimens for this disease. Recently, scholars from Dana-Farber's Gastrointestinal Cancer Treatment Center in Boston analysed what effect vitamin D administration might have on the condition of colorectal cancer patients. The conclusions they obtained can certainly be considered interesting.