If you dream of having the cancer, then it shows the losses, grief, lost hopes and unhappiness. Perhaps you think that the life is passing by without any meaning in it. The dream could also represent the problems and troubles in your life that are making you feel stressed. The emotional turmoil you are suffering from in your waking life reflects in your dreams. Perhaps you must rethink the true values of your life and start everything from the beginning if it is needed. If the other person has got cancer in your dream, then it shows your worries about that particular person. Maybe you feel hopeless in helping him. Perhaps the dream suggests you to start being so careful about everything and everyone.