So, what does this mean? ""the Kevetrin/sunitinib

So, what does this mean? ""the Kevetrin/sunitinib combination is the first we've used in which actual tumor shrinkage is noted."

Does this mean they have a lineup of Kevetrin/pfizerchemoagent combos to test out? This was first in line of multiple combinations to be tested? This was first combo of anything with sunitnib to cause tumor shrinkage? This was first combo they ever tested in house to show such results?