What is This Disease Called Cancer?

Cancer is a well known human disease. Mention is contained in medical records that have survived over the centuries. However at no previous time does it appear to have been as common as is now the case in our modern society when it may be anticipated that approximately one in four of us will suffer from it. Most of us will know from the number of our immediate contacts with friends and relatives who are suffering, that this is not an extreme prediction but is possibly an underestimation, should the momentum continue.