undergo chemotherapy for any one of the following settings: 1. Setting 1: Neoadjuvant chemotherapy prior to cheom-RT 2. Setting 2: Palliative chemotherapy in Chemonaive patients 3. Setting 3: Palliative chemotherapy in previously treated patients (i.e. 2nd line or 3rd line chemo) [clinicaltrials_resource:341b30e1f4eb69098b80c55ccaaaf699]

undergo chemotherapy for any one of the following settings: 1. Setting 1: Neoadjuvant chemotherapy prior to cheom-RT 2. Setting 2: Palliative chemotherapy in Chemonaive patients 3. Setting 3: Palliative chemotherapy in previously treated patients (i.e. 2nd line or 3rd line chemo) [clinicaltrials_resource:341b30e1f4eb69098b80c55ccaaaf699]