Inclusion Criteria:  Adults (age >18 years) with a diagnosis of a GI cancer, that is receiving one of the below treatments:  Capecitabine ONLY Capecitabine concurrent with Radiation Therapy Capecitabine with Temozolomide Capecitabine with Oxaliplatin Capecitabine with Mitomycin and concurrent Radiation Therapy  Exclusion Criteria:  -