EXEL—"evidence of bone scan resolution (partial or complete)" occurred in 19 out of 20 patients treated with XL184.
This is not a quantitative finding, but rather the qualitative impression of investigators based on visual inspection of the scans. There is no formal definition of “bone scan resolution” in prostate cancer.
Is that NOT good enough for approval?
Of course not, and even EXEL has not claimed that it is. Was your question serious?
“The efficient-market hypothesis may be the foremost piece of B.S. ever promulgated in any area of human knowledge!”