Table 1 Comparison of the number of copies of chromosome 7 in the papillary and oncocytoma areas of the left kidney lesion as determined by fluorescence in situ hybridisation using centromeric peptide nucleic acid probes.

Number of signals/nucleus	Papillary area (% of nuclei)	Oncocytoma area (% of nuclei)
0	2	1
1	9	19
2	31	65
3	53	13
4	5	2