RecruitingDrug trialGENOCARE: A Prospective, Randomized Clinical Trial of Genotype-Guided Dosing Versus Usual CareThis is a prospective, randomized study designed to compare genotype-guided dosing to usual care in patients with pancreas cancer and colorectal cancer who are UGT1A1 intermediate metabolizers (\*1/\*28) (heterozygotes) and usual UGT metabolizers (\*1/\*1). All patients will be assessed for UGT1A1 genotype at screening and those with intermediate or usual UGT1A1 genotypes (\*1/\*28, \*1/\*1) will be randomized to genotype-guided dosing versus usual care.