Sirna what? Sirna-027 was the much ballyhooed lead drug from Sirna Therapeutics, which the company licensed to AGN in 2005: #msg-7926760. (MRK acquired Sirna in 2006: #msg-14401261.)
Sirna-027 produced good phase-1 results; the biggest problem may have been that the duration of the clinical effect was too short, as can be seen from the table in #msg-12579143.
I’ve been pretty sure that this program was dead for quite some time because AGN never talked about it. Now, it’s 100% — read the last paragraph of this Reuters newswire:
›› “…we just completed a collaboration with Allergan looking at the eye and targets within the eye. Now we are initiating our own efforts within that area.” ‹‹
With the demise of Sirna-027, OPK (#msg-21124315, #msg-25128755) and PFE (#msg-13574577) are, to my knowledge, the only companies still testing RNAi in the clinic as a treatment for AMD. MRK at one time had a JV with ALNY to develop an AMD drug, but the collaboration made no progress and was dissolved in 2006.
“The efficient-market hypothesis may be the foremost piece of B.S. ever promulgated in any area of human knowledge!”