Telephone follow-up is a feasible tool for prospective outcome assessment of symptom palliation in metastatic cancer patients. Telephone follow-up is recommended for outcome assessment of symptom relief when it can achieve the same purpose as clinic follow-up. Data collection remains a challenge in the palliative patient population. Further studies are required to determine how well other methods of maximizing data collection, such as through the use of caregivers, can provide reliable and accurate information.