
Join to View Full Profile
MGH Cancer Center55 Fruit StreetBoston, MA 02114
Dr. Klempner is on Doximity
As a Doximity member you'll join over two million verified healthcare professionals in a private, secure network.
- Gain access to free telehealth tools, such as our “call shielding” and one-way patient texting.
- Connect with colleagues in the same hospital or clinic.
- Read the latest clinical news, personalized to your specialty.
Education & Training
Beth Israel Deaconess Medical CenterFellowship, Hematology and Medical Oncology, 2010 - 2013
Mass General Brigham/Brigham and Women's HospitalResidency, Internal Medicine, 2007 - 2010
University of Massachusetts Medical SchoolClass of 2007
Hamilton CollegeB.A., Magna Cum Laude, 2003
Certifications & Licensure
MA State Medical License 2010 - 2027
ME State Medical License 2021 - 2026
CA State Medical License 2013 - 2020
American Board of Internal Medicine Medical Oncology
Awards, Honors, & Recognition
- Standing Ovation Award Cedars-Sinai Medical Center, 2016
- SuperDoctors Southern CA Rising Star 2016-2017
- Top Physician Communicator UC Irvine, 2015
Publications & Presentations
PubMed
- The pan-tumor landscape of gene amplifications and copy number amplification ratio for established and emerging clinical targets.Jessica K Lee, Julia C F Quintanilha, Kuei-Ting Chen, Bernard Fendler, Candice Francheska B Tambaoan
Clinical Cancer Research. 2026-03-23 - First-line zolbetuximab plus mFOLFOX6 and nivolumab in unresectable CLDN18.2-positive gastric or gastroesophageal junction adenocarcinoma: a phase 2 trial.Kohei Shitara, Hirokazu Shoji, Nicola Fazio, Sara Lonardi, Keun-Wook Lee
Nature Medicine. 2026-03-16 - Advances in the management of metastatic gastric cancer: current strategies and emerging therapeutics.Joan Choo, Amalya Sargsyan, Vahe Khachatryan, Sara Lonardi, Filippo Pietrantonio
Nature Reviews. Clinical Oncology. 2026-03-10
Journal Articles
- PD-1 as an emerging target in gastric cancer: current evidenceTran PN, Sarkissian S, Chao J, Klempner SJ, Gastrointestinal Cancer: Targets and Therapy, 1/1/2017
- Moving Molecular Subtypes to the Clinic in Gastric CancerChao J, Lee J, Klempner SJ, Transl Cancer Res, 1/1/2016
- ROS1 (c-ros oncogene 1)Klempner SJ, Ou, SH, Atlas Genet Cytogenet Oncol Haematol, 1/1/2014
Books/Book Chapters
Abstracts/Posters
- Neoadjuvant Chemotherapy Improves Survival In Patients With Clinical T4b Colon Cancer.Dehal A, Graff-Baker AN, Voung B, Fischer T, Klempner SJ, et al, Digestive Disease Week, Chicago, IL, 1/6/2017
- Genomic profiling of circulating tumor DNA (ctDNA) from patients with advanced cancers of the GI tract and anus.Schrock AB, Young L, Klempner SJ, Bordoni R, Ross JS, et al, GI ASCO, 1/1/2017
- Comprehensive genomic profiling (CGP) of esophageal and tubular GI tumors identifies differing frequencies of ErbB family member amplifications with therapeutic implic...Bailey M, Ali SM, Schrock AB, Klempner SJ, George B, Lipson D, et al, GI ASCO, 1/1/2017
Lectures
- Early Is Better: The Roles of Prevention, Screening, and Early DetectionASCO Gastrointestinal Cancers Symposium - San Francisco, CA - 1/23/2020
- DKN-01 in combination with pembrolizumab in patients with advanced gastroesophageal adenocarcinoma (GEA): Tumoral DKK1 expression as a predictor of response and survival.ASCO Gastrointestinal Cancers Symposium - San Francisco, CA - 1/23/2020
- Help From Within: DNA to Personalized Therapy for Gastric Cancer1/18/2017
Authored Content
- Immunotherapies as a Targeted Therapy to Accelerate Personalized CareFebruary 2020
- Immunotherapies as a Targeted Therapy to Accelerate Personalized CareFebruary 2020
Press Mentions
New Molecular Targets, Technologies, and Cancer Treatments Take Center Stage at the AACR-NCI-EORTC ConferenceNovember 5th, 2025
Cellular Immunotherapy Breakthroughs Fuel $370 Billion Market SurgeOctober 15th, 2025
FDA Approves Vyloy for Advanced Gastric or Gastroesophageal Junction CancerOctober 23rd, 2024
Grant Support
- Steering the next generation of NCI-sponsored clinical trials in gastroesophageal cancersMASSACHUSETTS GENERAL HOSPITAL2024–2029
- Advanced Development of Patient Ascites Therapeutic Response BiosensorsMASSACHUSETTS INSTITUTE OF TECHNOLOGY2025–2028
Professional Memberships
- Member
- Member
- Member
- ESMOMember
Viewing the full profile is available to verified healthcare professionals only.
Find your profile and take control of your online presence:









