Gastrointestinal Malignancies
Clinical Trials
Medical Oncology

Get to Know Dr. Benjamin R. Tan

Dr. Benjamin Tan is a medical oncologist at Alvin J. Siteman Cancer Center in St. Louis. He is the principal investigator of a clinical trial involving an effective immunotherapy combination for patients with peritoneal mesothelioma.

Tan has been serving at Siteman and the Washington University School of Medicine for more than two decades, treating patients with a wide variety of abdominal cancers.

His specialties include upper and lower gastrointestinal malignancies.

Siteman is the only National Cancer Institute-designated Comprehensive Cancer Center in Missouri, providing the highest possible standard of care. Its multidisciplinary approach to treatment has been lauded as unsurpassed.

Tan provides the leadership in the multicenter clinical trial studying the immunotherapy combination of Opdivo and Yervoy. In 2020 it was approved by the FDA for first-line treatment of pleural mesothelioma, although this trial involves a wide range of rare cancers that includes peritoneal mesothelioma.

Siteman Cancer Center has five satellite locations that specialize in genomic and genetic testing that often lead to more personalized, targeted treatments.

Specialties of Dr. Benjamin R. Tan

  • Medical oncology
  • Peritoneal mesothelioma
  • Liver cancer
  • Gastrointestinal malignancies
  • Clinical trials
  • Developmental therapeutics
  • AIDS-associated malignancies

Dr. Benjamin R. Tan’s Experience and Education

  • Siteman Cancer Center 
  • Washington University Medical Center
  • Barnes-Jewish West County Hospital
  • Barnes-Jewish St. Peters Hospital
  • St. Mary’s Medical Center
  • Pinckneyville Oncology Clinic
  • Washington University School of Medicine (Fellowship)
  • Sinai Hospital of Baltimore (Residency)
  • University of the Philippines College of Medicine (M.D.)

Awards and Certifications

  • American Board of Internal Medicine
  • American Board of Medical Oncology (Diplomate)
  • Best Doctors, St. Louis Magazine (2007-2020)
  • Powered by Hope Champion Award (2019)
  • Teacher of the Year Award in Hematology, Washington University (2016, 2019)
  • Barnes-Jewish Hospital Foundation Cancer Research Award (1999)

Mesothelioma Clinical Trials Under Dr. Benjamin R. Tan

  • A phase II clinical trial studying the immunotherapy combination of Opdivo and Yervoy for patients with rare tumors, including peritoneal mesothelioma and pancreatic tumors.

Publications of Dr. Benjamin R. Tan

  • Harding, J. et al. (2020, December). Phase 1b Study of Enzalutamide With or Without Sorafenib in Patients With Advanced Hepatocellular Carcinoma. Oncologist.
  • Chapman, W.C. et al. (2018, November). Hepatocellular carcinoma: Where are we in 2018? Current Problems in Surgery.
  • Trikalinos, N.A. et al. (2018, October). Systemic Therapy for Combined Hepatocellular-Cholangiocarcinoma: A Single Institution Experience. Journal of the National Comprehensive Cancer Network.
  • Morton, A. & Tan B. (2016). Colorectal and Anal Cancers. Cancer: Principles and Practice of Oncology Review.