An NCI-designated Comprehensive Cancer Center
Andreas Kaiser

Andreas M. Kaiser, M.D.

Colorectal Surgeon
Clinical Expertise
  • Acute diverticulitis
  • Diverticulitis
  • Benign disorders of the anus
  • Colorectal and anal cancer
  • Functional disorders of the colon and rectum
  • Hemorrhoids
  • Inflammatory bowel disease
  • Robotic surgery
Clinical Professor, Department of Surgery
Referring Physicians/Colleagues: 800-826-4673
Email: [email protected]
Other Languages Spoken
  • French
  • German
  • Italian

Clinical Teams

  • Colorectal Cancer
  • Gastrointestinal Cancers
Andreas M. Kaiser, M.D., is a clinical professor and Chief of Colorectal Surgery in the Department of Surgery at City of Hope National Medical Center (an NCI-designated Comprehensive Cancer Center). He graduated in 1988 from the University of Zurich in Switzerland, did an internship in surgical pathology, and a residency in general surgery at the University of Zurich Hospital from 1990 to 1998. In addition, Dr. Kaiser completed a research fellowship at Harvard Medical School, a fellowship in Visceral Surgery at the University Hospital in Zurich, and a fellowship in colorectal surgery at Keck School of Medicine of USC.

Before joining City of Hope, Dr. Kaiser was a Professor of Clinical Surgery at USC since 2000, and served as Interim Chairman of the Department of Colorectal Surgery from 2008-2009. He is board-certified by the Swiss Board of Surgery in General Surgery (1998) and Visceral Surgery (2006), and by the European Surgery Qualification Board in Coloproctology (2002). He is a fellow of the American College of Surgeons (F.A.C.S.) and of the American Society of Colon and Rectal Surgeons (F.A.S.C.R.S.), and a member of several national and international professional associations and committees. He is a member of the NIH Advisory Board for the Pelvic Floor Dysfunction Network of the National Institutes of Health.
Dr. Kaiser has extensive experience in every aspect of even the most complex colorectal diseases as well as interdisciplinary treatment in the management of colorectal and anal cancer, hereditary colorectal cancer, inflammatory bowel disease, acute diverticulitis, functional disorders of the colon and rectum, and benign disorders of the anus. He has become a referral center for challenging cases. Dr. Kaiser has written numerous articles and book chapters, including his own book "McGraw-Hill Manual of Colorectal Surgery," and he was an editor of the "SAGES Manual Colorectal Surgery" (2019), as well as "Chassin's Surgical Strategies in General Surgery" (5th edition, 2020). Dr. Kaiser also serves as editor-in-chief of Clinical and Experimental Gastroenterology and associate editor of Diseases of the Colon and Rectum, the official journal of the American Society of Colon and Rectal Surgeons. He served as Guest Editor on "Hereditary Colorectal Cancer" for "Seminars in Colon and Rectal Surgery" and was the lead author on an ASCRS Task Force for "New Technologies for Fecal Incontinence."



  • Robotic surgery, laparoscopic surgery, including 3D laparoscopy, (robotic) transanal minimally invasive surgery for rectal polyps and cancer (r-TAMIS)  
  • Transanal endoscopic microsurgery for rectal polyps and cancer (TEMS) 
  • Endoluminal surgical intervention (ELSI), combined endoscopic-laparoscopic surgery (CELS), stapled hemorrhoidectomy (PPH)


Colorectal cancer: rectal cancer, colon cancer, hereditary cancer (FAP, Lynch and others); anal cancer: primary cancer, recurrent cancer, palliative setting; complex pelvic redo surgery in teamwork with urology, orthopedic/neurosurgery, liver surgery, inflammatory bowel disease (ulcerative colitis, Crohn's disease), acute and chronic diverticulitis, colonic/enteric fistula formation (to skin, bladder, vagina), benign disorders of the anus (hemorrhoids, anal fissures, anorectal abscess, colorectal fistulas, rectovaginal fistulas, pilonidal disease, pruritus ani, STDs), functional disorders of the colon and rectum (prolapse, constipation, pelvic floor dysfunction) 

Continence Preservation (Sphincter Preservation) 

Sphincter-saving surgery for cancer or inflammatory bowel disease, continent ileostomy (Kock pouch, T-pouch), sphincter reconstruction

Transfusion-Free Surgery / Jehovah’s Witness program

Fecal Incontinence, including: 

Sacral nerve stimulation (interstim, neuromodulation), artificial bowel sphincter (ABS, neosphincter), magnetic ring (Fenix), Secca procedure, Solesta injection, pelvic floor dysfunction, pelvic organ prolapse


Colonoscopy, advanced endoscopy, endoluminal surgical intervention (ELSI), combined endoscopic-laparoscopic surgery (CELS), endorectal ultrasound, anophysiology testing (manometry, EMG, pudendal nerve testing)  


City of Hope Comprehensive Cancer Center, 1500 East Duarte Road

Duarte, CA 91010


A.M. Kaiser. The McGraw-Hill Manual of Colorectal Surgery. McGraw-Hill, New York, 2008. 760 pages. ISBN 978-0-07-159070-9.
A.M. Kaiser (Editor): Hereditary colorectal cancer. Seminars in Colon Rectal Surgery 2011;22(2):63-146 (June 2011).
P. Sylla, A.M. Kaiser, D. Popovich (Eds): SAGES Manual Colorectal Surgery 2018-2019: 40 chapters. ISBN 978-3-030-24811-6. Springer Publisher, 2019
A.M. Kaiser (Colorectal Section Editor): In: S.E.H. Scott-Conner: Chassin's Operative Strategy in General Surgery. 5th edition, 2016-2020: 57 colorectal surgery chapters). Springer Publisher, 2020.


Zelhart M, Kaiser AM. Robotic vs Laparoscopic vs Open Colorectal Surgery: Towards Defining Criteria to the Right Choice. Surg Endosc 2017.
Maguire LH, Alavi K, Sudan R, Wise PE, Kaiser AM, Bordeianou L. Surgical Considerations in the Treatment of Small Bowel Crohn's Disease. J Gastrointest. Surg 2017; 21(2):398-411
Saldana Ruiz N, Kaiser AM. Fecal Incontinence – challenges and solutions. World J Gastroenterol 2017; 23(1):11-24.
Rosen D, Kaiser AM. Seton management for transphincteric fistula in ano: harm or charm. Colorectal Disease, 2016;18:488-495.
Devaraj B, Liu W, Tatum J, Cologne K, Kaiser AM. Medically Treated Diverticular Abscess Associated with High Risk of Recurrence and Disease Complications. Dis. Colon Rectum 2016; 59:208-15.
Paquette IM, Varma MG, Kaiser AM, S.R. Steele, J.F. Rafferty. The American Society of Colon and Rectal Surgeons' Clinical Practice Guideline for the Treatment of Fecal Incontinence. Dis Colon Rectum. 2015;58(7):623-36.
Alavi K, Chan S, Wise P, Kaiser AM, R. Sudan, L. Bordeianou. Fecal Incontinence: Etiology, Diagnosis, and Management. J Gastrointest Surgy 2015:19:1910-21.
Devaraj B, Kaiser AM. Surgical management of ulcerative colitis in the era of biologicals. Inflammatory Bowel Disease 2015; 21:208-220.
Kaiser AM, Hogen R, Bordeianou L, Alavi K, Wise PE, Sudan R. Clostridium difficile infection from a surgical perspective. J Gastrointest Surg, 2015; 19:1363-1377.
Devaraj B, Kaiser AM. Impact of Technology on Indications and Limitations for Transanal Surgical Removal of Rectal Neoplasms. World J Surg Proced, 2015; 5(1):1-13.
Devaraj B, Kaiser AM. Surgical management of ulcerative colitis in the era of biologicals. Inflamm Bowel Dis 2015; 21 (1): 208-20.
Lamb MN, Kaiser AM. Elective Resection versus Observation After Non-Operative Management of Complicated Diverticulitis with Abscess - A Systematic Review and Meta-Analysis. Dis. Colon Rectum 2014; 57 (12): 1430-40.
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