Table 5. Results of surveillance.

Surveillance result	Recurrence <6/12	Recurrence >6/12	CEA/CA 19-9 elevated before liver resection
CEA/CA 19-9 raised before CT evidence	5	7	5 (2,3)
CT evidence before raised CEA/CA 19-9	8	11	12 (6,6)
CT and CEA/CA 19-9 correlate evidence	2	4	3 (2,1)

CEA, carcinoembryonic antigen >5 ng ml⁻¹; CA 19-9, carbohydrate antigen 19-9 >37 U ml⁻¹; CT, computed tomography; recurrence <6/12, recurrence diagnosed within 6 months of liver resection; recurrence >6/12, recurrence diagnosed beyond 6 months of liver resection.