Andreas M. Kaiser, M.D.

Andreas M. Kaiser, M.D., is professor and chief of the Division of Colorectal Surgery in the Department of Surgery at City of Hope, a National Cancer Institute-designated comprehensive cancer center). He graduated in 1988 from the University of Zurich in Switzerland followed by 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 the University of Southern California.

Before joining City of Hope, Dr. Kaiser was faculty in surgery (most recent role as a professor) at USC from 2000 to 2019, and he 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 in Visceral Surgery (2006), and by the European Surgery Qualification Board in Coloproctology (2002). He is a fellow of the American College of Surgeons (FACS), the American Society of Colon and Rectal Surgeons (FASCRS) and most recently was inducted as a fellow of the most prestigious American Surgical Association. He is 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 and has become a referral center for challenging cases. He provides comprehensive interdisciplinary management for all stages of colorectal and anal cancer, hereditary colorectal cancer, inflammatory bowel disease, acute/chronic diverticulitis, functional disorders of the colon and rectum, and benign disorders of the anus. 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, 2022). 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."

Dr. Kaiser also serves as editor-in-chief of Clinical and Experimental Gastroenterology, as co-editor of the Journal of Robotic Surgery and associate editor of Diseases of the Colon and Rectum, the official journal of the American Society of Colon and Rectal Surgeons.

Services

Technology

• Robotic surgery, laparoscopic surgery, including 3D laparoscopy, (robotic) transanal minimally invasive surgery forrectal polyps and cancer (r-TAMIS)
• Radical multivisceral resections for advanced or metastatic cancer, complex pelvic redo surgery in teamwork with urology, orthopedic/neurosurgery, liver surgery
• Transanal endoscopic microsurgery (TEMS) for rectal polyps and cancer
• Endoluminal surgical intervention, combined endoscopic-laparoscopic surgery
• Anorectal: stapled hemorrhoidectomy (PPH), sacral nerve stimulation, complex reconstructions
• Continent ileostomy (T-pouch, Kock pouch, BCIR)

Diseases

• Colorectal cancer of all stages: rectal cancer, colon cancer, hereditary cancer (FAP, Lynch and others)
• Anal cancer: primary cancer, recurrent cancer, palliative setting
• Complications after surgeries in other institutions
• Inflammatory bowel disease: ulcerative colitis and 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 and STDs
• Functional disorders of the colon and rectum (prolapse, constipation and 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 (neosphincter), magnetic ring (Fenix), Secca procedure, Solesta injection, pelvic floor dysfunction, pelvic organ prolapse

Diagnostics

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