If you had cancer and the cancer cells had a different kind of cancer in them would you be cancer free or have double the cancer
Cancer can spread but it isn't like it is "catchy" if that makes since. Like you can have lung cancer and it spread to your vital organs like your liver but no you do not have lung cancer in your liver. It is just the cancer cells spreading.
If you had cancer and the cancer cells had different kinds of cancers, you would not be cancer free. The cancerous cells simply spreads into other parts of the body. The normal cells lose their structure and become raptured. Find out more from http://www.cancer.gov/cancertopics/cancerlibrary/what-is-cancer.