PSP was invented by Professor Q.Y. Yang of Shanghai Normal University in 1982. It took him 10 years to finish research and the three phases of clinical trials. The phrase 2 and phase 3 randomized double-blind placebo-based clinical trials for PSP were completed in 1992 in 8 and 14 hospitals respectively with 485 and 650 patients in different control groups. Since then, PSP has been widely used, and over a million patients have benefited from it. In 1999, Hong Kong University did clinical trials again on PSP and obtained the same positive results. The efficacy of PSP is well- proven by tests and time, and no side effect has ever been reported.
To help patients in selecting good supplements for their treatments of cancer, it is also advisable to do some research work to know and understand the products you have selected. A few test reports from a single research institute cannot say much of a product. Results supported by successful clinical trials are no doubt speak for themselves. It is worth to note that “being preparing for” clinical trial and “have finished” clinical trials are completely different things, because clinical trials are time consuming and costly.