Expertise in
15
conditions

Dr. John Marshall

Oncology
MedStar Georgetown University Hospital
3800 Reservoir Rd NW, 
Washington, DC 
Offers Telehealth
Expertise in
15
conditions
MedStar Georgetown University Hospital
3800 Reservoir Rd NW, 
Washington, DC 

Overview

John Marshall is an Oncologist practicing medicine in Washington, Washington, D.c..

Dr. Marshall is highly rated in 15 conditions, according to our data. His clinical expertise encompasses Colorectal Cancer, Pancreatic Cancer, Familial Colorectal Cancer, Pancreatectomy, and Hepatectomy.

He is actively involved in clinical research, co-authoring 193 peer reviewed articles and participating in 11 clinical trials.

Specialties

Oncology

Licenses

Internal Medicine in DC

Hospital Affiliations

Medstar Georgetown University Hospital
Medstar Washington Hospital Center

Languages Spoken

English

Gender

Male

Insurance

Accepted insurance can change. Please verify directly with the provider.

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Accepted insurance plans:

Aetna
  • EPO
  • HMO
  • POS
  • PPO
Anthem BCBS
  • EPO
  • HMO
  • POS
  • PPO
CareFirst
  • HMO
  • POS
  • PPO
Cigna
  • EPO
  • HMO
  • PPO
Commonwealth Care Alliance
  • MANAGED MEDICAID PLAN
  • MEDICARE MAPD
  • MEDICARE PDP
  • MEDICARE SNP
  • MEDICARE-MEDICAID PLAN
Health Care Services Corporation
  • HMO
  • INSURANCE PLAN
  • MANAGED MEDICAID PLAN
  • MEDICARE MAPD
  • MEDICARE PDP
  • MEDICARE SNP
  • OTHER COMMERCIAL
  • OTHER MEDICARE
  • OTHER MEDICARE PART D
  • PPO
Highmark
  • EPO
  • HMO
  • PPO
Humana
  • HMO
  • INDEMNITY
  • POS
  • PPO
Independent Health
  • EPO
  • POS
  • PPO
Managed Medicaid
  • OTHER MANAGED MEDICAID
UnitedHealthcare
  • EPO
  • HMO
  • POS
  • PPO
Wellcare
  • EPO
  • HMO
  • INSURANCE PLAN
  • MANAGED MEDICAID PLAN
  • MEDICARE MAPD
  • MEDICARE PDP
  • MEDICARE SNP
  • MEDICARE-MEDICAID PLAN
  • OTHER MEDICARE
  • OTHER MEDICARE PART D
View 7 Less Insurance Carriers -

Locations

MedStar Georgetown University Hospital
3800 Reservoir Rd NW, Washington, DC 20007

Clinical Research

Clinical research consists of overseeing clinical studies of patients undergoing new treatments and therapies, and publishing articles in peer reviewed medical journals. Providers who actively participate in clinical research are generally at the forefront of the fields and aware of the most up-to-date advances in treatments for their patients.

11 Clinical Trials

A Double Blind Placebo-Controlled Trial of Eflornithine and Sulindac to Prevent Recurrence of High Risk Adenomas and Second Primary Colorectal Cancers in Patients With Stage 0-III Colon or Rectal Cancer, Phase III - Preventing Adenomas of the Colon With Eflornithine and Sulindac (PACES)
A Double Blind Placebo-Controlled Trial of Eflornithine and Sulindac to Prevent Recurrence of High Risk Adenomas and Second Primary Colorectal Cancers in Patients With Stage 0-III Colon or Rectal Cancer, Phase III - Preventing Adenomas of the Colon With Eflornithine and Sulindac (PACES)
Enrollment Status: Active_not_recruiting
Publish Date: April 02, 2026
Intervention Type: Drug
Study Phase: Phase 3
A Phase 1b/2, Open Label, Dose Escalation Study of Margetuximab in Combination With Pembrolizumab in Patients With Relapsed/Refractory Advanced HER2+ Gastroesophageal Junction or Gastric Cancer
A Phase 1b/2, Open Label, Dose Escalation Study of Margetuximab in Combination With Pembrolizumab in Patients With Relapsed/Refractory Advanced HER2+ Gastroesophageal Junction or Gastric Cancer
Enrollment Status: Completed
Publish Date: March 17, 2025
Intervention Type: Biological
Study Drug: Margetuximab+Pembrolizumab
Study Phase: Phase 1/Phase 2
A Randomized, Double-blind, Placebo-controlled, Active Comparator Phase 2/3 Study of Tucatinib in Combination With Trastuzumab, Ramucirumab, and Paclitaxel in Subjects With Previously Treated, Locally-advanced Unresectable or Metastatic HER2+ Gastric or Gastroesophageal Junction Adenocarcinoma (GEC)
A Randomized, Double-blind, Placebo-controlled, Active Comparator Phase 2/3 Study of Tucatinib in Combination With Trastuzumab, Ramucirumab, and Paclitaxel in Subjects With Previously Treated, Locally-advanced Unresectable or Metastatic HER2+ Gastric or Gastroesophageal Junction Adenocarcinoma (GEC)
Enrollment Status: Completed
Publish Date: January 22, 2025
Intervention Type: Drug, Other
Study Drugs: Tucatinib, Trastuzumab, Ramucirumab, Paclitaxel
Study Phase: Phase 2/Phase 3
Phase I Study of Proton Therapy in Adjuvant Pancreatic Cancer (Proton-PANC)
Phase I Study of Proton Therapy in Adjuvant Pancreatic Cancer (Proton-PANC)
Enrollment Status: Completed
Publish Date: October 24, 2024
Intervention Type: Drug, Radiation
Study Drug: mFOLFIRINOX
Study Phase: Phase 1
A Phase II/III Trial of Neoadjuvant FOLFOX With Selective Use of Combined Modality Chemoradiation Versus Preoperative Combined Modality Chemoradiation for Locally Advanced Rectal Cancer Patients Undergoing Low Anterior Resection With Total Mesorectal Excision (PROSPECT)
A Phase II/III Trial of Neoadjuvant FOLFOX With Selective Use of Combined Modality Chemoradiation Versus Preoperative Combined Modality Chemoradiation for Locally Advanced Rectal Cancer Patients Undergoing Low Anterior Resection With Total Mesorectal Excision (PROSPECT)
Enrollment Status: Unknown
Publish Date: February 02, 2024
Intervention Type: Procedure, Other, Drug
Study Phase: Phase 2/Phase 3
A Multicenter, Randomized, Open-label, 3-Arm Phase 3 Study of Encorafenib + Cetuximab Plus or Minus Binimetinib vs. Irinotecan/Cetuximab or Infusional 5-Fluorouracil (5-FU)/Folinic Acid (FA)/Irinotecan (FOLFIRI)/Cetuximab With a Safety Lead-in of Encorafenib + Binimetinib + Cetuximab in Patients With BRAF V600E-mutant Metastatic Colorectal Cancer
A Multicenter, Randomized, Open-label, 3-Arm Phase 3 Study of Encorafenib + Cetuximab Plus or Minus Binimetinib vs. Irinotecan/Cetuximab or Infusional 5-Fluorouracil (5-FU)/Folinic Acid (FA)/Irinotecan (FOLFIRI)/Cetuximab With a Safety Lead-in of Encorafenib + Binimetinib + Cetuximab in Patients With BRAF V600E-mutant Metastatic Colorectal Cancer
Enrollment Status: Completed
Publish Date: December 21, 2023
Intervention Type: Drug
Study Phase: Phase 3
A Phase I Dose Finding Study of an Experimental New Drug, PPARγ Agonist Taken by Mouth by Patients With Advanced or Malignancies
A Phase I Dose Finding Study of an Experimental New Drug, PPARγ Agonist Taken by Mouth by Patients With Advanced or Malignancies
Enrollment Status: Completed
Publish Date: October 19, 2020
Intervention Type: Drug
Study Phase: Phase 1
An Open Label, Multi-Center Phase 1b/2a Trial Investigating Different Doses of Sym004 in Combination With FOLFIRI in Patients With Metastatic Colorectal Cancer Progressing After First-Line Therapy
An Open Label, Multi-Center Phase 1b/2a Trial Investigating Different Doses of Sym004 in Combination With FOLFIRI in Patients With Metastatic Colorectal Cancer Progressing After First-Line Therapy
Enrollment Status: Terminated
Publish Date: March 26, 2019
Intervention Type: Drug
Study Phase: Phase 1/Phase 2
A Prospective Study for the Assessment of Recurrence Risk in Stage II Colon Cancer Patients Using ColoPrint
A Prospective Study for the Assessment of Recurrence Risk in Stage II Colon Cancer Patients Using ColoPrint
Enrollment Status: Unknown
Publish Date: January 09, 2019
A Pilot Study of Molecular Profile-Directed Chemotherapy for Metastatic HER2(-) Esophagogastric Adenocarcinoma
A Pilot Study of Molecular Profile-Directed Chemotherapy for Metastatic HER2(-) Esophagogastric Adenocarcinoma
Enrollment Status: Terminated
Publish Date: September 06, 2018
Intervention Type: Drug
Study Phase: Not Applicable
View 9 Less Clinical Trials

193 Total Publications

Clinical and molecular characterization of AXL in colorectal cancer, CALGB (Alliance)/SWOG 80405 and real-world data.
Clinical and molecular characterization of AXL in colorectal cancer, CALGB (Alliance)/SWOG 80405 and real-world data.
Journal: Journal for immunotherapy of cancer
Published: December 01, 2025
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Frequently Asked Questions about Dr. John Marshall

How do I make an appointment with Dr. John Marshall?

You can book an appointment with Dr. John Marshall by calling their office at 202-444-2000. MediFind provides direct contact information so you can schedule visits, second opinions, or consultations without navigating third-party calendars.

Is Dr. John Marshall a top-rated expert for Colorectal Cancer?

MediFind is an objective health platform that identifies experts based on real-world data. Dr. John Marshall is classified as an Elite expert for Colorectal Cancer, meaning they are among the top experts in the country for this condition. This ranking is based on their volume of patients, published research, and peer connections.

What conditions does Dr. John Marshall specialize in?

While Dr. John Marshall is a Oncology, they have specific expertise in Colorectal Cancer, Pancreatic Cancer, and Familial Colorectal Cancer. MediFind analyzes a doctor's articles and referral patterns to identify their specific areas of focus within Oncology.

Does Dr. John Marshall participate in research or clinical trials?

Yes. Dr. John Marshall has published 193 articles and abstracts on conditions like Colorectal Cancer. You can view a list of Dr. John Marshall's latest peer-reviewed publications and clinical trial participation on their profile to see if they are active in new treatments.

Does Dr. John Marshall accept my insurance?

Dr. John Marshall accepts most major insurance plans, including Aetna and Anthem BCBS. We recommend calling the office directly at 202-444-2000 to verify that your specific plan is currently accepted before your visit.

Areas of Expertise

MediFind evaluates expertise by pulling from factors such as number of articles a doctor has published in medical journals, participation in clinical trials, speaking at industry conferences, prescribing and referral patterns, and strength of connections with other experts in their field.

Learn more about MediFind’s expert tiers

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