In cell therapy, the processed tissue from the organs, embryos, or fetuses of animals such as sheep or cows is injected into patients. Cell therapy is promoted as an alternate pattern of cancer treatment. The technical clue does not support assertions that cell therapy is productive in treating cancerous disease or the other sickness. Serious facet effects can result from cell treatment and it can be dangerous too. It is necessary to differentiate between this distinct method engaging animal units and cancerous disease treatments that make use of human units, such as bone marrow transplantation.