Web-Based Advance Care Planning for Patients With Advanced Cancer

The goal of this clinical trial is to determine whether a web-based advance care planning (ACP) intervention can reduce preferences for aggressive life-sustaining treatments among patients with advanced cancer. The main questions it aims to answer are: * Does a web-based ACP intervention reduce preferences for aggressive life-sustaining treatments among patients with advanced cancer? * Does a web-based ACP intervention support informed medical decision-making regarding future care? Researchers will compare a web-based ACP intervention plus a Patient Right to Autonomy Act leaflet with a Patient Right to Autonomy Act leaflet alone to determine whether the web-based ACP intervention is more effective in reducing preferences for aggressive life-sustaining treatments. Participants will: * Be randomly assigned to either an intervention group or a control group * Receive either a web-based ACP educational program plus a Patient Right to Autonomy Act leaflet, or a Patient Right to Autonomy Act leaflet alone * Complete questionnaires at baseline, immediately after the intervention, and one week after the intervention