Although cancer cells originate from normal cells, once cancer turns into cancer cells, they differ from normal cells in all aspects, as follows: 1. normal cells can stop growing and can grow under regulation, while cancer cells are immortalized cells that can multiply indefinitely. 2. normal cells will apoptosis and die according to the program, while cancer cells live forever, similar to the first point. 3. Normal cells are similar in size and shape under the microscope, while cancer cells are completely different, with some large and some small nuclei, and the content of nuclei and nucleoli are also much higher than normal cells. Normal cells are also monitored by the immune system and can perform their own functions, but cancer cells are able to escape from the immune cell environment and are not cleared by the immune system, and do not have normal functions. liver cells are able to synthesize albumin, etc., but liver cancer cells have no function at all in this regard, which eventually leads to severe hypoproteinemia in patients. There are many other differences between normal cells and cancer cells, but in general, one thing to remember is that normal cells will be regulated, grow up and die normally, while cancer cells will not listen to instructions and will live forever, growing and destroying everywhere.