<?xml version="1.0" encoding="UTF-8"?><protocol_summary><protocol><id>15549</id><no>MK-5684-004</no><status>Open</status><title>A Phase 3, Randomized, Open-label Study of MK-5684 Versus Alternative Abiraterone Acetate or Enzalutamide in Participants with Metastatic Castration-resistant Prostate Cancer (mCRPC) That Progressed On or After Prior Treatment with One Nextgeneration Hormonal Agent (NHA)</title><nct_id>NCT06136650</nct_id><sponsor_type>Industrial</sponsor_type><age_group>Adult</age_group><treatment_type>Treatment</treatment_type><phase>III</phase><scope>Global</scope><disease_site>Prostate</disease_site><PI>Rapisuwon, Suthee</PI><institution>MedStar Health and GUMC; Medstar Washington Hospital Center</institution><oncology_group>Genito-urinary<DOWG_name>Oncology Group</DOWG_name></oncology_group><management_group>MHRI Washington Cancer Institute</management_group></protocol><sipVersion>2026.1.0 Build 16</sipVersion><copyright> &lt;a href="https://advarra.com" target="_blank"&gt;&amp;copy; 2026 Advarra, Inc.&lt;/a&gt; </copyright></protocol_summary>