https://seekingalpha.com/article/4314267-real-value-of-breakthrough-therapy-designation

The info is within the above analysis.

 
``This chart shows that historically only about 39% of applicants are granted BTD designation. Of that 39% that get the coveted designation, only 147 drugs to date have been granted under the program, out of 771 total applicants.``

The excerpt above is a little confusing but I have diciphered that since 2012 total applicants for BTD was 771.  39% of those received BTD, so that works out to 307 BTDs granted since 2012.  But of those 307 BTDS only 147 of them turned out as approved drugs.  So 147 divided by 307 = 48% of BTDs have become approved drugs. 

I get a sense from the article that BTD doesn`t really increase your odds of success by that much, but rather a BTD dramatically reduces the time to approval.  Unless of course, your company is run by a sloth who rebutes a free-ride 5-year trial from BP, has zero means to do it quicker or less expensive, has no money in the bank, and reminds us there is no deadline with a BTD. 

Let us pray...