If my info is correct. S1 will be available in the States in a couple years.and is now under studied by the FDA for its effectiveness as compare to Xeloda.
Last year,when I attended the ASCO 2011 convention there was a poster about s1, and the gentleman on duty indicated that they will try to market S1 thru a larger drug company in the States. I will get more info about S1 in the up coming ASCO2012 convention.
Basically S1 is like the Xeloda (Capecitabine) that is current available in Europe and in the States. these are the prodrug of 5FU taken by mouth.
Please know that my personal opinion is not intended nor implied to be a substitute for professional medical advice. If provided, information are for educational purposes.Consult doctor is a MUST for changing of treatment plans.