The delay is for the safety portion. Efficacy results should be out long before then (I think that portion of the study is 12 weeks). I wasn't familiar with PGNX's compound but did a quick lookup and saw its sub-q. 118 would have the added benefit of being oral. Do you happen to have any links to its (RELISTOR's) efficacy?
If your hoping for a negative (sorry I am not ) NKTR hasn't tested the 12.5mg dose and 5 only showed a trend but 25mg was very efficacious.