1) To determine if Veterans undergoing chemotherapy who receive Cancer CarePartners report significant improvement in the summed severity of symptoms (the sum of 0-10 severity across 8 core symptoms) compared to Veterans receiving symptom monitoring and self-management advice; secondarily, to determine if they experience better adherence to chemotherapy and utilization. (2) To determine if caregivers participating in the intervention provide significantly more social support to patients than do controls; secondarily, to determine if they experience more caregiver burden and distress than do controls. (3) To determine whether impacts on patients are mediated by mastery. (4) To determine whether impacts on caregivers are mediated by mastery.