Ma Somsouk, MD, MAS

Dean M. Craig Endowed Chair in Gastrointestinal Medicine, UCSF

Professor of Medicine in Residence, UCSF Division of Gastroenterology at ZSFG; Core Faculty, UCSF Center for Vulnerable Populations

Cancer Center Program Membership

Cancer Control

Research Summary

1. Leveraging digital health and care coordination to improve health services delivery to vulnerable populations. We embrace big data and technology to design, develop, and deliver economic and effective services for patients in the area of cancer screening and follow-up.

2. Development of intestinal organoids from humans to understand barrier function, systemic inflammation, inflammatory bowel disease, HIV persistence, infection, and microbiome. Approaches employed: organoid models, isolation of epithelial cells, lymphocytes, microbiota, and interventional trials such as fecal transplant.

Research Funding

  • May 16, 2022 - February 28, 2027 - IMProving Adherence to Colonoscopy through Teams and Technology (IMPACTT) , Principal Investigator . Sponsor: NIH, Sponsor Award ID: R01CA271031
  • March 15, 2021 - February 28, 2026 - Cytomegalovirus (CMV), the gut barrier and immune dysfunction in HIV , Co-Investigator . Sponsor: NIH, Sponsor Award ID: R01AI155680
  • August 12, 2020 - July 31, 2025 - In Vivo PET Imaging of HIV Infection , Co-Investigator . Sponsor: NIH, Sponsor Award ID: R01AI152932
  • January 10, 2020 - December 31, 2024 - Modeling intestinal dysfunction in HIV infection with organoid technology , Co-Principal Investigator . Sponsor: NIH, Sponsor Award ID: R01DK123746


Pomona College, Claremont, CA, BA, 1993-1997, Chemistry
Harvard Medical School, Boston, MA, MD, 1997-2002, Medicine
Harbor-UCLA Medical Center, Torrance, CA, Residency, 2002-2005, Internal Medicine
University of California, San Francisco, CA, Fellowship, 2005-2008, Gastroenterology
University of California, San Francisco, CA, MAS, 2006-2008, Epidemiology and Biostatistics

Honors & Awards

  • Sigma Xi
  • Phi Beta Kappa
  • Magna Cum Laude
  • Paul Dudley White / Andrew Sellard Fellowship
  • UCSF Distinction in Mentoring Award
  • Fellow of the American Gastroenterological Association
  • Dean M. Craig Endowed Chair in Gastrointestinal Medicine
  • UCSF TICR Program Award for Excellence in Faculty Advising
  • UCSF Holly Smith Award for Exceptional Service to the School of Medicine Nominee

Selected Publications

  1. Patel S, Sewell JL, Bhuket T, Somsouk M. Delivering High-Quality, Efficient Gastroenterology Care to Vulnerable and Underserved Populations: Special Considerations and Possible Solutions. Clin Gastroenterol Hepatol. 2023 Aug 25.  View on PubMed
  2. Peluso MJ, Ryder D, Flavell R, Wang Y, Levi J, LaFranchi BH, Deveau TM, Buck AM, Munter SE, Asare KA, Aslam M, Koch W, Szabo G, Hoh R, Deswal M, Rodriguez A, Buitrago M, Tai V, Shrestha U, Lu S, Goldberg SA, Dalhuisen T, Durstenfeld MS, Hsue PY, Kelly JD, Kumar N, Martin JN, Gambir A, Somsouk M, Seo Y, Deeks SG, Laszik ZG, VanBrocklin HF, Henrich TJ. Multimodal Molecular Imaging Reveals Tissue-Based T Cell Activation and Viral RNA Persistence for Up to 2 Years Following COVID-19. medRxiv. 2023 Jul 31.  View on PubMed
  3. Santiago-Rodríguez EJ, Hoeft KS, Lugtu K, McGowen M, Ofman D, Adler J, Somsouk M, Potter MB. Implementation of a novel program to support colorectal cancer screening in a community health center consortium before and after the onset of COVID-19: a qualitative study of stakeholders' perspectives. Implement Sci Commun. 2023 May 22; 4(1):54.  View on PubMed
  4. Duarte MJ, Tien PC, Somsouk M, Price JC. The human microbiome and gut-liver axis in people living with HIV. Curr HIV/AIDS Rep. 2023 06; 20(3):170-180.  View on PubMed
  5. Burns S, Wang J, Somsouk M. Effect of Mailed Fecal Immunochemical Test Outreach for Patients Newly Eligible for Colorectal Cancer Screening. Dig Dis Sci. 2023 06; 68(6):2315-2317.  View on PubMed
  6. Odufalu FD, Sewell JL, Rudrapatna V, Somsouk M, Mahadevan U. Assessing the Impact of COVID-19 on IBD Outcomes Among Vulnerable Patient Populations in a Large Metropolitan Center. Inflamm Bowel Dis. 2023 Mar 21.  View on PubMed
  7. McClellan SP, Canchola AJ, Potter MB, Gomez SL, Somsouk M. Neighborhood socioeconomic status and the effectiveness of colorectal cancer screening outreach with mailed fecal immunochemical tests within a safety net healthcare system in San Francisco, CA: A subgroup analysis of a randomized controlled trial. Prev Med. 2023 02; 167:107388.  View on PubMed
  8. Burns S, Somsouk M. Durability of FIT Screening After Cessation of a Screening Outreach Intervention. Dig Dis Sci. 2023 05; 68(5):1777-1779.  View on PubMed
  9. Altinbas A, Holmes JA, Salloum S, Lidofsky A, Alatrakchi N, Somsouk M, Hunt P, Deeks S, Chew KW, Lauer G, Kruger A, Lin W, Chung RT. LOXL-2 and TNC-C are markers of liver fibrogenesis in HCV/HIV-, HIV- and HCV-infected patients. Biomark Med. 2022 08; 16(11):839-846.  View on PubMed
  10. Khoong EC, Rivadeneira NA, Pacca L, Schillinger D, Lown D, Babaria P, Gupta N, Pramanik R, Tran H, Whitezell T, Somsouk M, Sarkar U. Extent of Follow-Up on Abnormal Cancer Screening in Multiple California Public Hospital Systems: A Retrospective Review. J Gen Intern Med. 2023 01; 38(1):21-29.  View on PubMed
  11. Mukherjea A, Shariff-Marco S, Yang J, Tseng W, Palaniappan L, Li J, Ivey SL, Somsouk M, Gomez SL. Determinants of Colorectal Cancer Screening among South Asian Americans. J Asian Health. 2022 Apr; 10(e202202):1-12.  View on PubMed
  12. Hiatt RA, Sibley A, Venkatesh B, Cheng J, Dixit N, Fox R, Ling P, Nguyen T, Oh D, Palmer NR, Pasick RJ, Potter MB, Somsouk M, Vargas RA, Vijayaraghavan M, Ashworth A. From Cancer Epidemiology to Policy and Practice: the Role of a Comprehensive Cancer Center. Curr Epidemiol Rep. 2022; 9(1):10-21.  View on PubMed
  13. Chang HW, Yan D, Singh R, Bui A, Lee K, Truong A, Milush JM, Somsouk M, Liao W. Multiomic Analysis of the Gut Microbiome in Psoriasis Reveals Distinct Host‒Microbe Associations. JID Innov. 2022 May; 2(3):100115.  View on PubMed
  14. Sharma AE, Lyson HC, Cherian R, Somsouk M, Schillinger D, Sarkar U. A Root Cause Analysis of Barriers to Timely Colonoscopy in California Safety-Net Health Systems. J Patient Saf. 2022 01 01; 18(1):e163-e171.  View on PubMed
  15. Sangaramoorthy M, Yang J, Guan A, DeRouen MC, Tana MM, Somsouk M, Thompson CA, Gibbons J, Ho C, Chu JN, Cheng I, Gomez SL, Shariff-Marco S. Asian American/Pacific Islander and Hispanic Ethnic Enclaves, Neighborhood Socioeconomic Status, and Hepatocellular Carcinoma Incidence in California: An Update. Cancer Epidemiol Biomarkers Prev. 2022 02; 31(2):382-392.  View on PubMed
  16. Wu G, Zuck P, Goh SL, Milush JM, Vohra P, Wong JK, Somsouk M, Yukl SA, Shacklett BL, Chomont N, Haase AT, Hatano H, Schacker TW, Deeks SG, Hazuda DJ, Hunt PW, Howell BJ. Gag p24 Is a Marker of Human Immunodeficiency Virus Expression in Tissues and Correlates With Immune Response. J Infect Dis. 2021 11 16; 224(9):1593-1598.  View on PubMed
  17. Dai B, Hackney JA, Ichikawa R, Nguyen A, Elstrott J, Orozco LD, Sun KH, Modrusan Z, Gogineni A, Scherl A, Gubatan J, Habtezion A, Deswal M, Somsouk M, Faubion WA, Chai A, Sharafali Z, Hassanali A, Oh YS, Tole S, McBride J, Keir ME, Yi T. Dual targeting of lymphocyte homing and retention through α4β7 and αEβ7 inhibition in inflammatory bowel disease. Cell Rep Med. 2021 08 17; 2(8):100381.  View on PubMed
  18. Lee B, Keyes E, Rachocki C, Grimes B, Chen E, Vittinghoff E, Ladabaum U, Somsouk M. Increased Colorectal Cancer Screening Sustained with Mailed Fecal Immunochemical Test Outreach. Clin Gastroenterol Hepatol. 2022 06; 20(6):1326-1333.e4.  View on PubMed
  19. Zullo KM, Douglas B, Maloney NM, Ji Y, Wei Y, Herbine K, Cohen R, Pastore C, Cramer Z, Wang X, Wei W, Somsouk M, Hung LY, Lengner C, Kohanski MH, Cohen NA, Herbert DR. LINGO3 regulates mucosal tissue regeneration and promotes TFF2 dependent recovery from colitis. Scand J Gastroenterol. 2021 Jul; 56(7):791-805.  View on PubMed
  20. Ge J, Najafi N, Zhao W, Somsouk M, Fang M, Lai JC. A Methodology to Generate Longitudinally Updated Acute-On-Chronic Liver Failure Prognostication Scores From Electronic Health Record Data. Hepatol Commun. 2021 Jun; 5(6):1069-1080.  View on PubMed

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