Andrew Posselt, PhD, MD

Bariatric and transplant surgeon

Dr. Andrew Posselt, a bariatric and transplant surgeon, is co-director of the Pancreatic Islet Transplantation Program at UCSF Medical Center. He specializes in adult and pediatric kidney, liver and pancreas transplantation as well as laparoscopic and open bariatric surgery. In addition to caring for patients, he conducts research on pancreatic islet cell transplantation, mechanisms of allograft rejection and tolerance, and the metabolic and biochemical consequences of bariatric surgery.

Posselt is a member of several professional and honorary societies and has given presentations on transplant issues related to clinical care and research. He is a professor in residency in surgery at UCSF, where he supervises residents and fellows in transplant services and general surgery. He earned medical and doctorate degrees in immunology from the University of Pennsylvania and completed an internal medicine residency, general surgery residency and transplant fellowship at UCSF, before joining the staff in 2003.

Read a Q&A with Posselt, who discusses islet cell transplants to treat diabetes.

Clinics

Bariatric Surgery Center
400 Parnassus Ave., Sixth Floor, Reception Desk 6S
San Francisco, CA 94143-0338
Phone (existing patients):
(415) 353-2161
Phone (new patients):
(415) 353-2804
Fax: (415) 353-2505

Hours: Monday to Friday
8 a.m. – 5 p.m.

Connie Frank Transplant Center at UCSF
400 Parnassus Ave., Seventh Floor
San Francisco, CA 94143
Phone: (415) 353-1551
Pre-Kidney Fax: (415) 353-8708
Post-Kidney Fax: (415) 353-8381

Hours: 8 a.m. – 5 p.m.

Liver Transplant Program
400 Parnassus Ave., Third Floor
San Francisco, CA 94143
Phone: (415) 353-1888
Fax: (415) 353-8917

Hours: Tuesdays, 8 a.m. – noon, and Thursdays, 1 - 4 p.m.

Pancreas Transplant Services
400 Parnassus Ave., Seventh Floor
San Francisco, CA 94143
Phone: (415) 353-1551
Pre-Transplant Fax: (415) 353-8708
Post-Transplant Fax: (415) 353-4183

Hours: Monday to Friday
8 a.m. – 5 p.m.

Total Pancreatectomy - Islet Auto Transplant (TP-IAT)
400 Parnassus Avenue, 7th Floor
San Francisco CA 94143-0780
Phone: (415) 353-1473
Fax: (415) 353-8709

Conditions & Treatments

Board Certification

Surgery, American Board of Surgery

Academic Title

Professor

More about Andrew Posselt

Additional Languages

Czechoslovakian
French
German
Spanish

Education

University of Pennsylvania School of Medicine 1993

Residencies

UCSF Medical Center, Internal Medicine 1996
UCSF Medical Center, Surgery 2000

Selected Research and Publications

  1. Schafer AL, Kazakia GJ, Vittinghoff E, Stewart L, Rogers SJ, Kim TY, Carter JT, Posselt AM, Pasco C, Shoback DM, Black DM. Effects of Gastric Bypass Surgery on Bone Mass and Microarchitecture Occur Early and Particularly Impact Postmenopausal Women. J Bone Miner Res. 2017 Dec 27.
  2. Harbell JW, Morgan T, Feldstein VA, Roll GR, Posselt A, Kang SM, Feng S, Hirose R, Freise CE, Stock P. Splenic Vein Thrombosis Following Pancreas Transplantation: Identification of Factors That Support Conservative Management. Am J Transplant. 2017 Nov; 17(11):2955-2962.
  3. Kim TY, Schwartz AV, Li X, Xu K, Black DM, Petrenko DM, Stewart L, Rogers SJ, Posselt AM, Carter JT, Shoback DM, Schafer AL. Bone Marrow Fat Changes After Gastric Bypass Surgery Are Associated With Loss of Bone Mass. J Bone Miner Res. 2017 Nov; 32(11):2239-2247.
  4. Ricordi C, Goldstein JS, Balamurugan AN, Szot GL, Kin T, Liu C, Czarniecki CW, Barbaro B, Bridges ND, Cano J, Clarke WR, Eggerman TL, Hunsicker LG, Kaufman DB, Khan A, Lafontant DE, Linetsky E, Luo X, Markmann JF, Naji A, Korsgren O, Oberholzer J, Turgeon NA, Brandhorst D, Friberg AS, Lei J, Wang LJ, Wilhelm JJ, Willits J, Zhang X, Hering BJ, Posselt AM, Stock PG, Shapiro AMJ. Erratum. National Institutes of Health-Sponsored Clinical Islet Transplantation Consortium Phase 3 Trial: Manufacture of a Complex Cellular Product at Eight Processing Facilities. Diabetes 2016;65:3418-3428. Diabetes. 2017 09; 66(9):2531.
  5. Song S, Blaha C, Moses W, Park J, Wright N, Groszek J, Fissell W, Vartanian S, Posselt AM, Roy S. Correction: An intravascular bioartificial pancreas device (iBAP) with silicon nanopore membranes (SNM) for islet encapsulation under convective mass transport. Lab Chip. 2017 Jun 27; 17(13):2334.
  6. Wisel SA, Gardner JM, Roll GR, Harbell J, Freise CE, Feng S, Kang SM, Hirose R, Kaufman DB, Posselt AM, Stock PG. Pancreas-After-Islet Transplantation in Nonuremic Type 1 Diabetes: A Strategy for Restoring Durable Insulin Independence. Am J Transplant. 2017 Sep; 17(9):2444-2450.
  7. Song S, Blaha C, Moses W, Park J, Wright N, Groszek J, Fissell W, Vartanian S, Posselt AM, Roy S. An intravascular bioartificial pancreas device (iBAP) with silicon nanopore membranes (SNM) for islet encapsulation under convective mass transport. Lab Chip. 2017 May 16; 17(10):1778-1792.
  8. Yamanaga S, Posselt AM, Freise CE, Kobayashi T, Tavakol M, Kang SM. A Single Perioperative Injection of Dexamethasone Decreases Nausea, Vomiting, and Pain after Laparoscopic Donor Nephrectomy. J Transplant. 2017; 2017:3518103.
  9. Ricordi C, Goldstein JS, Balamurugan AN, Szot GL, Kin T, Liu C, Czarniecki CW, Barbaro B, Bridges ND, Cano J, Clarke WR, Eggerman TL, Hunsicker LG, Kaufman DB, Khan A, Lafontant DE, Linetsky E, Luo X, Markmann JF, Naji A, Korsgren O, Oberholzer J, Turgeon NA, Brandhorst D, Chen X, Friberg AS, Lei J, Wang LJ, Wilhelm JJ, Willits J, Zhang X, Hering BJ, Posselt AM, Stock PG, Shapiro AM, Chen X. National Institutes of Health-Sponsored Clinical Islet Transplantation Consortium Phase 3 Trial: Manufacture of a Complex Cellular Product at Eight Processing Facilities. Diabetes. 2016 11; 65(11):3418-3428.
  10. Kasiske BL, Kumar R, Kimmel PL, Pesavento TE, Kalil RS, Kraus ES, Rabb H, Posselt AM, Anderson-Haag TL, Steffes MW, Israni AK, Snyder JJ, Singh RJ, Weir MR. Abnormalities in biomarkers of mineral and bone metabolism in kidney donors. Kidney Int. 2016 10; 90(4):861-8.
  11. Hering BJ, Clarke WR, Bridges ND, Eggerman TL, Alejandro R, Bellin MD, Chaloner K, Czarniecki CW, Goldstein JS, Hunsicker LG, Kaufman DB, Korsgren O, Larsen CP, Luo X, Markmann JF, Naji A, Oberholzer J, Posselt AM, Rickels MR, Ricordi C, Robien MA, Senior PA, Shapiro AM, Stock PG, Turgeon NA. Phase 3 Trial of Transplantation of Human Islets in Type 1 Diabetes Complicated by Severe Hypoglycemia. Diabetes Care. 2016 07; 39(7):1230-40.
  12. Song S, Faleo G, Yeung R, Kant R, Posselt AM, Desai TA, Tang Q, Roy S. Silicon nanopore membrane (SNM) for islet encapsulation and immunoisolation under convective transport. Sci Rep. 2016 Mar 24; 6:23679.
  13. McEnhill ME, Brennan JL, Winnicki E, Lee MM, Tavakol M, Posselt AM, Stock PG, Portale AA. Effect of Immigration Status on Outcomes in Pediatric Kidney Transplant Recipients. Am J Transplant. 2016 06; 16(6):1827-33.
  14. Usatin DJ, Perito ER, Posselt AM, Rosenthal P. Under Utilization of Pancreas Transplants in Cystic Fibrosis Recipients in the United Network Organ Sharing (UNOS) Data 1987-2014. Am J Transplant. 2016 05; 16(5):1620-5.
  15. Moassesfar S, Masharani U, Frassetto LA, Szot GL, Tavakol M, Stock PG, Posselt AM. A Comparative Analysis of the Safety, Efficacy, and Cost of Islet Versus Pancreas Transplantation in Nonuremic Patients With Type 1 Diabetes. Am J Transplant. 2016 Feb; 16(2):518-26.
  16. Kaplan JA, Schecter SC, Rogers SJ, Lin MYC, Posselt AM, Carter JT. Expanded indications for bariatric surgery: should patients on chronic steroids be offered bariatric procedures? Surg Obes Relat Dis. 2017 Jan; 13(1):35-40.
  17. Schafer AL, Weaver CM, Black DM, Wheeler AL, Chang H, Szefc GV, Stewart L, Rogers SJ, Carter JT, Posselt AM, Shoback DM, Sellmeyer DE. Intestinal Calcium Absorption Decreases Dramatically After Gastric Bypass Surgery Despite Optimization of Vitamin D Status. J Bone Miner Res. 2015 Aug; 30(8):1377-85.
  18. Tai DS, Shen N, Szot GL, Posselt A, Feduska NJ, Habashy A, Clerkin B, Core E, Busuttil RW, Hines OJ, Reber HA, Lipshutz GS. Autologous islet transplantation with remote islet isolation after pancreas resection for chronic pancreatitis. JAMA Surg. 2015 Feb; 150(2):118-24.
  19. Schafer AL, Li X, Schwartz AV, Tufts LS, Wheeler AL, Grunfeld C, Stewart L, Rogers SJ, Carter JT, Posselt AM, Black DM, Shoback DM. Changes in vertebral bone marrow fat and bone mass after gastric bypass surgery: A pilot study. Bone. 2015 May; 74:140-5.
  20. Ahearn AJ, Parekh JR, Posselt AM. Islet transplantation for Type 1 diabetes: where are we now? Expert Rev Clin Immunol. 2015 Jan; 11(1):59-68.

Publications are derived from MEDLINE/PubMed and provided by UCSF Profiles, a service of the Clinical & Translational Science Institute (CTSI) at UCSF. Researchers can make corrections and additions to their publications by logging on to UCSF Profiles.