There is always the threat that someone could stumble on a new plant or chemical that suddenly cures all cancer of all types. However, with the trill ions of dollars and potential discoveried over the years, we still have no cure. So, i think the risk is always there, but the likelihood of it happening is extremely low. I would trade my potential losses here if that happened and we had a cure for cancer....in a heartbeat. For now, i like the opportunities PPHM most likely will provide, a viable treatment to most cancers with higher success rate and i become somewhat wealthy. If you don't think you can handle the risk, then biotech investment may not be your cup of tea.
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