Thanks for your question on Health Care Magic. I can understand your concern. Stem cell therapy is newer advance in treatment of cancer. Cancer is basically group of cells which are constantly and vigorously growing. So in brain cancer brain cells are growing rapidly and causing mass lesion. So the main idea behind stem cell therapy is to develop new cells in the body which replace cancer cells. Stem cells are progenitor cells, from which all cells of the body develop. So by giving stem cells, possibility of development of new cells in place of cancer cells can be expected. So this is encouraging option in cancer treatment. You need to discuss in depth about its effectiveness and cost benefit ratio with your doctor. Hope I have solved your query. Wishing good health to your brother. Thanks.