See pathology report: Am. J. Surg. Path 2011 deals with unfavorable features and while traditional grading systems have been tried, the latest work shows that only necrosis, sarcomatoid features, being quite large, and having tumor in small vessels warn of a less favorable prognosis.
Answered 7/31/2012
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Fuhrman grade: The fuhrman grading system is the most widely accepted system of grading kidney cancer. It ranges from 1 to 4, with 1 and 2 considered low grade while 3 or 4 are considered high grade.
Answered 8/11/2012
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