US Top 20
US-based physicians, ranked.
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1NH
Nicholas HornsteinGI Med Oncologist @NorthwellHealth via Fellow @MDAndersonNews + IM @UCLAHealth | CUMC ‘18 | Interests: ML/AI, Clinical…97/100Peer Engagement Score -
2DC
Dr. Cathy EngVICC Assoc Director, Strategic Relations and Research Partnerships, Exec Director, Young Adult Cancers Program…87/100Peer Engagement Score -
3OB
Oncology BrothersPractice changing discussions by community oncologists-Rohit Gosain @RoswellPark & Rahul Gosain @WilmotCancer.…86/100Peer Engagement Score -
4AM
Anirban MaitraPancreatic cancer researcher, GI pathologist, husband, dad. Striving to improve the lives of patients with cancer. 🇺🇸 🇮🇳79/100Peer Engagement Score -
5WP
77/100Peer Engagement Score -
6JG
Jun Gong, MDMedical oncologist and researcher in gastrointestinal and genitourinary cancers @CedarsSinai. Hematology/Oncology…68/100Peer Engagement Score -
7JR
Jeff RyckmanMedical Physicist ➡️ Rad Onc | Chasing LR-PFS 🎯, QoL ⚖️ & reproducibility 📊 | Building @RadOncReview + #RadOncCalc…63/100Peer Engagement Score -
8ML
Mark Lewis, MD, FASCODirector, GI Oncology, @Intermountain. Interests: neuroendocrine tumors, cancer syndromes, empathy (even had a Whipple…63/100Peer Engagement Score -
9DN
Dr. Nina Niu SanfordGI Radiation Oncologist | Boston, @Princeton, @harvardmed, now @UTSWNews in Dallas | clinical trials | buying in bulk…61/100Peer Engagement Score -
10DL
Daneng LiGI Medical Oncologist @CityofHope. Hepatobiliary & NET Cancers57/100Peer Engagement Score -
11KJ
Krishan JethwaGI Radiation Oncologist | Associate PD @MayoRadOnc @MayoClinic | Passions for #PatientCare, #MedEd, QoL, #PublicHealth…56/100Peer Engagement Score -
12PK
Pashtoon Kasi MD, MSOncologist |Researcher| ColorectalCancer #CRCSM👨🏼🎓@MayoClinic @PittTweet Alum 🧬#ctDNA #LiquidBiopsies…51/100Peer Engagement Score -
13SA
Santhosh AmbikaOncologist/Hematologist- Doing my part to help onc patients. + fintwit48/100Peer Engagement Score -
14AP
Allan Pereira, MD, PhDGI Medical oncologist and researcher. Associate Member Moffitt Cancer Center #endcancer #clinicalresearch . Tweets are…46/100Peer Engagement Score -
15DC
Dani CastilloMedical Oncologist/ Researcher @COH45/100Peer Engagement Score -
16RH
Ryan Huey, MD, MSGI Medical Oncologist, @UTMDAnderson: unknown primary, colorectal, and pancreatic cancer + high-quality cancer care…43/100Peer Engagement Score -
17VS
Vivek Subbiah, MDDrug Development| Precision Oncology| Tissue-Agnostic Precision Medicine #Oncologist, #Phase1trials…43/100Peer Engagement Score -
18UG
Udhayvir GrewalGI Oncologist @WinshipAtEmory via @uiowacancer #GIOnc/#NETs, clinical trials, cardiac disease in cancer 🦓🎗️@TheGutOncLab42/100Peer Engagement Score -
19GG
Garrett Green, MDRadiation Oncologist @RenownHealth Inst of Cancer | Assistant Clinical Professor @UnivofNevada | BS @NorthwesternU | MD…41/100Peer Engagement Score -
20IS
ilyas sahin, MDAssistant Professor @HarvardMed | GI Medical Oncologist @MassGeneralNews | Liver & GI Cancers | Clinical Trials39/100Peer Engagement Score
Global Top 20
Physicians worldwide, ranked.
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1AVArndt VogelClinician-Scientist, ESMO Ambassador, focussed on Liver Cancer & Precision Oncology, Toronto General Hospital/Princess…100/100Peer Engagement Score
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2NH
Nicholas HornsteinGI Med Oncologist @NorthwellHealth via Fellow @MDAndersonNews + IM @UCLAHealth | CUMC ‘18 | Interests: ML/AI, Clinical…97/100Peer Engagement Score
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3NM90/100Peer Engagement Score
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4DC
Dr. Cathy EngVICC Assoc Director, Strategic Relations and Research Partnerships, Exec Director, Young Adult Cancers Program…87/100Peer Engagement Score
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5OB
Oncology BrothersPractice changing discussions by community oncologists-Rohit Gosain @RoswellPark & Rahul Gosain @WilmotCancer.…86/100Peer Engagement Score
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6DR
Dr Rishabh Jain🩺 DM Medical Oncologist, AIIMS Delhi 🌍 . Let’s keep oncology interesting !86/100Peer Engagement Score -
7DK82/100Peer Engagement Score
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8GOGrainne O'KaneMedical Oncologist; clinical and translational researcher pancreatic and hepatobiliary cancers. Views are my own 🇮🇪🇨🇦80/100Peer Engagement Score
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9YE
Yakup ErgünMedical oncologist | Trial data → clinical decisions | Critical appraisal & practical algorithms | #bcsm #lcsm #crcsm…79/100Peer Engagement Score -
10AM
Anirban MaitraPancreatic cancer researcher, GI pathologist, husband, dad. Striving to improve the lives of patients with cancer. 🇺🇸 🇮🇳79/100Peer Engagement Score
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11EA
78/100Peer Engagement Score -
12DA
Dr Amol AkhadeOncology care , to give or not to give chemo , data analysis , oncology pharamocovigilance , enthusiastic critic…78/100Peer Engagement Score -
13WP
77/100Peer Engagement Score
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14AL77/100Peer Engagement Score
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15SS
Shankar SivaRadiation Oncologist at the Peter MacCallum Cancer Centre @petermaccc, Professor of Medicine, University of Melbourne…76/100Peer Engagement Score -
16SGSharlene Gill, MD, MPH, MBA, FASCOCancer Doctor, Professor, Lifelong Learner #UBC #CCTG #CAMO #GICancers #TEDxSpeaker 🇨🇦 Tweets are my own76/100Peer Engagement Score
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17MC
MV ChandrakanthMedical Oncologist (Breast • GU • GI) Simplifying Oncology for DoctorsI Building MV Onco I Head Academics | Narayana…75/100Peer Engagement Score -
18PCPaolo CiracìM.D. - ESMO Research Fellow at Hospital del Mar Research Institute (Colorectal Precision Medicine Group) | 🌍…68/100Peer Engagement Score
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19JG
Jun Gong, MDMedical oncologist and researcher in gastrointestinal and genitourinary cancers @CedarsSinai. Hematology/Oncology…68/100Peer Engagement Score
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20JR
Jeff RyckmanMedical Physicist ➡️ Rad Onc | Chasing LR-PFS 🎯, QoL ⚖️ & reproducibility 📊 | Building @RadOncReview + #RadOncCalc…63/100Peer Engagement Score
FAQ
Who are the top GI Cancer KOLs in the USA in 2026?
In the KOL Pulse 2026 GI Cancer rankings, the top US physicians are Nicholas Hornstein (#1), Dr. Cathy Eng (#2) and Oncology Brothers (#3). The full US top 20 is listed on this page and updated after each major meeting.
Who are the top GI Cancer KOLs worldwide in 2026?
Globally, the top GI Cancer physicians on X in 2026 are Arndt Vogel (#1), Nicholas Hornstein (#2) and Nieves Martinez Lago MD PhD (#3). The Global tab lists the top 20.
How are the KOL Pulse GI Cancer rankings determined?
The rankings measure verified physician engagement with each oncologist's posts about gi cancer clinical trials on X: reposts, quotes, replies and mentions from other physicians. Engagement around the major oncology meetings (ASCO, ESMO and ASCO GI) counts most. Only physicians are ranked, and only engagement from physicians counts.
What is the Peer Engagement Score?
It is a relative score out of 100. The top-ranked gi cancer physician worldwide scores 100, and every other physician is scored against that leader. The same score appears on the US and Global lists, so the two are directly comparable.
Who is eligible for the rankings?
Practicing physicians whose trial posts are engaged by several different physician colleagues. Media, industry and institutional accounts are not ranked, and engagement from them does not count.
How often are the rankings updated?
KOL Pulse updates the GI Cancer rankings after each major meeting. This page was last updated November 10, 2026.
Can I see more about each GI Cancer KOL?
Yes. Each ranked US physician links to a KOL Pulse profile with the clinical trials they discussed, their 2025–26 presentations, the colleagues who amplify them and their CMS Open Payments summary.