A great diversity of cell types, tissues, and organs were able to develop mostly due to the lack of firm cell walls. A cancer cell is a great example of how uncontrollable the growth of cells might be. Cancer can be best described as a division of a certain group of cells beyond the usual limits, a destruction of contiguous tissues, and a spread of cancer cells to different locations via blood or lymph. Cancer cells have the following general characteristics: unrestricted growth, growth despite genetic errors, ability to invade other tissues, ability to replicate.