Not quite sure about some aspects of your question about immunotherapy. As Franky said, the primary treatment for non-invasive high grade bladder cancer is BCG, which is a form of immunotherapy and it is very effective. There is a lot of research going on for more specific, targeted immunotherapy agents for bladder cancer, but none are readily available yet outside of clinical trials.
As for "alternative" treatments, to my knowledge none have been shown to be effective; some are just ineffective, but some can interfere with proven conventional therapies and cause some real problems. I WOULDN'T USE ANY SUBSTANCES OR DRUGS UNLESS YOUR PHYSICIAN CONCURS.
As for Chinese medicine, the answer is the same. Unless you are absolutely sure of what you are getting, the odds of obtaining any true medicines via the internet, etc., are very low. And none of these are proven therapies.
You can find LOTS of anecdotal "evidence" on how great these things are and on what they have cured. Please remember that this is NOT scientific evidence. And personal belief is a powerful drug in itself. Over 30% of the effects of any drug has been shown to be due to the "Placebo Effect." If someone believes it works, it can have an effect.
Buyer beware
Sara Anne