[LouLou]

I would say they have mixed and added the Herceptin to the bag of normal saline that had the exiry date 9-12-10. ie herceptin infusion in date, bag of saline out of date.
There checking system has failed them, or they noticed after they had already added the Herceptin to the fluid bag and decided that the cost of Herceptin out weighed having to throw it out and start again.
By the way I'm an infusion nurse