You done well, its great to post recent findings, As they say

There really is no highly effective treatment available for this kind of severe pain, so having a new way to treat it is exciting," Prof McIntosh says. If the new discovery eventually leads to a new pain drug that is combined with existing treatments, "you may be able to reduce the pain to a lower level than ever before."
Sounds like they are talking about something completely different than whats already out there now.

and this part too,
Researchers have also identified a natural painkiller produced in humans, termed opiorphin, which is several times as potent as morphine in pain studies in rats, according to a second study in the same issue of PNAS. Catherine Rougeot of the Institut Pasteur, Paris, and colleagues had recently identified a potent pain sensation inhibitor in rats called sialorphin and wondered whether humans also secrete a similar compound. The researchers successfully isolated opiorphin from human saliva that works in the same way. The analgesic properties of opiorphin warrant further study, they report.

This type of finding gives people hope of whom are suffering badly now
Brian