- OR non-measurable disease only, with rising serum cancer antigen (CA)15-3 or CA 27.29 or carcinoembryonic antigen (CEA) documented by two consecutive measurements taken at least 14 days apart with the most recent measurement being within 42 days prior to registration; the second CA 15-3 or CA 27.29 or CEA value must have at least a 20% increase over the first and for CA 15-3 or CA 27.29 be greater than or equal to 40 units/mL or for CEA be greater than or equal to 4 ng/mL