Patient samples will be obtained from human kidneys, using nephrectomies from renal cancer patients. Tissue sections will be uninvolved and away from tumor areas. Sections will be screened by a pathologist to ensure minimal pathologic changes, and minimal image artifacts.

Inclusion/Exclusion Criteria:

Inclusion:

• Minimal pathologic changes

Exclusion:

• Evidence of hydronephrosis
• Evidence of infectious disease
• Proteinuria
• Image artifacts

• 5% Interstitial Fibrosis and Tubular Atrophy (IFTA)