I am writing in regard t my father in law . He says this is a can...

No, sorry, it is not a cancer drug. It is a drug to help neuropathy (nerve pain). I'm sure it is given to cancer patients, depending on what type of cancer, I'm sure some have nerve pain symptoms.

For more and reliable information about drugs, try www.drugdigest.com. It's an invaluable site and one of the more brilliant parts of it is that you can list all the meds you are on and compare them for interactions. This has saved my mother-in-law's life once and my life twice. Doctors and even pharmacists cannot possibly keep up with every drug's every side effect or interaction. Self-education is the biggest tool in your arsenal for fighting for your health.
Best of luck!