Catherine Zivanov View Appointment Options Catherine Zivanov Appointment Options Research & Selected Publications Share Copy Link Email Link Print Page Facebook X Instagram LinkedIn Back Gmail Outlook Apple Mail Yahoo! Mail Appointment Options Whether you’re seeking a new patient appointment or exploring treatment options and looking for a second opinion, our Siteman care coordinators are ready to assist you. Request an Appointment Call Us Refer a Patient Research & Selected Publications ASO Author Reflections: De-escalation of Rectal Cancer Management and Expansion of Nonoperative Surveillance Protocols ASO Author Reflections: De-escalation of Rectal Cancer Management and Expansion of Nonoperative Surveillance Protocols Authors: Zivanov CN, Chapman WC Journal & Year: Ann Surg Oncol | 2025 Nonoperative Management of Rectal Cancer: Is "Near-Complete" Response Safe to Surveil? Nonoperative Management of Rectal Cancer: Is "Near-Complete" Response Safe to Surveil? Authors: Zivanov CN, Kau NS, Nalluri-Butz H, [...]one or more additional authors omitted Chapman WC Journal & Year: Ann Surg Oncol | 2025 ASO Visual Abstract: Nonoperative Management of Rectal Cancer: Is "Near-Complete" Response Safe to Surveil? ASO Visual Abstract: Nonoperative Management of Rectal Cancer: Is "Near-Complete" Response Safe to Surveil? Authors: Zivanov CN, Kau NS, Nalluri-Butz H, [...]one or more additional authors omitted Chapman WC Journal & Year: Ann Surg Oncol | 2025
