Table 1. A comparison of the two widely accepted scoring systems for cytoreductive surgery.

R status	Diameter of largest remaining tumor deposits	CC score
–	0 mm	CC-0N—no visible disease following neoadjuvant chemotherapy
R0—clear margins		CC-0S—no visible disease remains
R1—involved margins
R2a	2.5 mm	CC-1
	5 mm	CC-2
R2b	> 5–20 mm
R2c	> 20–25 mm
	> 25 mm	CC-3

Abbreviation: CC, completion of cytoreduction.