How randomized clinical trials came into their own.

to enhance recovery and reduce depression in cancer patients. As for survival and mortality, some of the clearest evidence seems to come from cardiovascular research. Patients who reported gaining strength and comfort from religion and who participated in social or community groups had lower mortality during the 6 months after surgery than those who were lacking in these categories. Creagan noted in his article that cancer survivors may "may be spared for reasons that are not clearly understood." But in general, the biology of any cancer is the most important determinant of its course, and the question of how far religion or spirituality can influence that remains unresolved.