In the human body every cell is programmed to different life span. A brain cell lives longer whereas some blood cells live from one day to 90 days. Cells in the body are also programmed to die in certain time for maintaining the proper functioning of the body. Cancer is a disease making one to realize that something is wrong at the fundamental level and is devastating for the whole system. The cells of the science was growing healthily, until some cells became cancerous and affecting the whole system.
Science is a means to know about everything in the cosmos.
Science was used in the health system to understand about the nature of health, to study it and to preserve it. But alas, we did not do that. We invented medicines to hamper the same health we where interested in it. Science has become so irrational. Physical science has understood and appreciated the laws of nature, but foolishly and viscously it has helped the biological sciences and chemical sciences to disobey the laws of that very same nature that it appreciated.