Clinical trials and FDA approval problems – Why do 92% of spinal cord treatments fail clinical trials or fail to get FDA approval ?

There is a high failure rate and high cost for clinical trials and FDA approvals.
Here is a video that goes through the problem.

80% cannot recruit enough patients for clinical trials.
50% do not have a problem with the drug, but need to redesign the trial (change the dosage or the procedure) and do not have the money to redesign and go through the process again.

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