A number of health-related problems, such as human stem cells, are addressed every day by medical researchers, such as Dr. David Greene. New, more effective patient care strategies are constantly being developed by doctors and other medical experts. Stem cell therapy is a new term used to treat chronic illnesses. A form of gene therapy, that is. This word refers to replacing sick or damaged cells in the body with new cells created in a lab. This revolutionary technique has drawn the interest of scientists from all across the world. It is because they believe biotechnology can be used effectively.