In order to determine which considerations healthcare professionals use in decision-making about treatment for inpatients with end-stage cancer, we observed 110 discussions at multidisciplinary meetings at two oncology departments. The discussions concerned 74 patients. Thirty-three of the 110 discussions concerned potentially life-prolonging or life-shortening treatments. The most important decision-making considerations were chance of improvement, patient's treatment wishes, amount of suffering, and the chance of therapy being successful. Discussions resulted in 6 decisions that might shorten life, 10 decisions that might prolong life, and 23 postponements of decisions because of lack of information. These observations confirm that medical interventions with a possible life-prolonging or life-shortening effect are a frequently discussed issue in medical decision-making for end-stage cancer patients in The Netherlands. Before making a decision, healthcare professionals gather extensive information about what gain is to be expected from an intervention. When healthcare professionals establish that a decision would be medically appropriate, the patient's wish will often be an important consideration.