From the latest Motley Fool article on Pfizer:
Other investors might wish that Pfizer would use some of its cash to acquire a few smaller companies. Protalix BioTherapeutics (NYSEMKT: PLX ) has been mentioned as one possible candidate. The two companies already partner together on Gaucher disease drug Elelyso. In February, Protalix spurred rumors that Pfizer could be interested in buying the company after it announced that it had engaged Citigroup to pursue a "broad array of strategic alternatives."
The Elelyso connection does appear to make Protalix a reasonable fit for Pfizer. Israeli newspaper Calcalist reported in February that Protalix wanted to sell for $1 billion. That's more than twice the current market cap of the company and could be more than what larger players are willing to pay. However, that price tag is only a drop in the bucket for Pfizer