Just To Be Clear...
Mort is absolutely correct that Zevalin is still available. The manufacturer dismanteled its sales force at the end of 2006 and is currently offering the drug for sale. Until another company purchases it, the drug is available to physicians, and patients can still call the toll free number to obtain a list of facilities where it is used.
Neither Bexxar nor Zevalin were commercially successful because they simply weren't embraced by medical oncologists as the important tool that they are. It is one thing to make a drug that works well for patients, but the free market system in America is driven by profit, and when a drug isn't profitable - well, the company makes a decision.
In the short term, the sale of Zevalin may give oncologists one more "reason" not to use RIT, but in the long run, a new owner may be able to give it just the boost that it needs to perform within the marketplace.
In the meantime, I have heard from very reliable sources that GSK remains committed to Bexxar. So for now, both drugs are still available.
Betsy