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It doesn't sound like they are going to be open to investigations. They are currently treating 70 patients at a cost of $300,000 per patient. If the treatment worked, they would have published and patented it and make a fortune helping patients all over the world. If they are not sure it works, then they need to keep it secret so they can scam rich foreigners.
As a reminder, some drugs, like Avastin, can make a tumor disappear from a scan even though it is still there. So I am not that impressed with the scan results. However, the article does say there is some evidence of living longer, which would impress me. I hope they let the expert investigate.
Secretive Mexican brain cancer clinic to be investigated by Australian expert