There is only one medicine in the past 100 years that cured a chronic illness besides penicillin and its derivatives. That medicine was developed by a small bio

There is only one medicine in the past 100 years that cured a chronic illness besides penicillin and its derivatives. That medicine was developed by a small biotech company named Pharmasset and bought by Gilead. So to answer your question, one might say that 100% of medicines that are not addictive pills to treat symptoms were developed by startups. To be fair, a lot of the addictive pills to treat symptoms were also developed by startups.