New research by Jose Baselga-One reason for Herceptin resistence
 

http://www.medicalnewstoday.com/medi...p?newsid=36218

http://clincancerres.aacrjournals.or...tract/12/2/424

This only further proves the necessity for tumor marker testing. Such testing is very benificial for specific targeted treatment selection with hopefully a more therapeutic effective response.