New changes to classification of kidney tumors

I was at a conferenence on Saturday, Current trends in genitourinary malignancies. This was a nice review of the newest advances in prostate, bladder, and kidney cancer.
One thing I learned is that with he help of molecular markers, what had been previously diagnosed as sarcomatoid renal cell cancer is actually a high grade transformation of the other types of renal cell cancers (clear cell, papillary, or chromophobe).
I thought this was an excellent one day conference and would recommend it to general urologists or medical oncologists.