- Anal cancer
- Bile duct cancer (Cholangiocarcinoma)
- Colon cancer
- Colorectal cancer
- Gastric cancer (Stomach cancer)
- Hepatocellular carcinoma
- Liver cancer
- Pancreatic cancer
- Rectal cancer
- Small bowel cancer
Mark H. O'Hara, MD
About me
- Associate Professor of Medicine (Hematology-Oncology) at the Hospital of the University of Pennsylvania
My education and training
- Medical School: SUNY Stony Brook School of Medicine
- Residency: University of Pittsburgh School of Medicine
- Fellowship: University of Pennsylvania Health System
Spoken languages
Reviews
476 reviews
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Insurance accepted
- Aetna Advantra Cares D-SNP
- Aetna Advantra Credit Value
- Aetna Advantra Eagle HMO
- Aetna Advantra Eagle POS
- Aetna Advantra Premier Plus PPO
- Aetna Advantra Value
- Aetna Advantra Value Plus
- Aetna APCN Plus (Multi-Tier)
- Aetna Better Health Kids (CHIP) - DH Only
- Aetna Flexible Five
- Aetna Freedom Core
- Aetna Gold
- Aetna HMO
- Aetna Philly Prime
- Aetna POS
- Aetna PPO APCN
- Aetna Premier
- Aetna Premier Plus
- Aetna Savings Plus
- Aetna Signature Administrators
- Aetna Student Health Plan PPO
- Aetna Upfront Advantage
- First Health HMO
- First Health POS
- First Health PPO
- Meritain - Aramark (Other)
- Meritain - Aramark (Pennsylvania Premier Medical Plan)
- Americhealth Caritas of PA VIP - LGH Only
- Amerihealth Caritas (Transplant patients only)
- Amerihealth Caritas of PA - LGH Only
- Centivo EPO
- Cigna Healthcare EPO
- Cigna Healthcare HMO
- Cigna Healthcare POS
- Cigna Healthcare PPO
- Claim Watcher (Homestead/ INDECs) Open Access
- Clover Health Choice
- Clover Health Choice Value PPO
- Clover Health Classic HMO
- Clover Health Value
Locations
Penn Medicine hospital privileges
- Hospital of the University of Pennsylvania: Has privileges to treat patients in the hospital.
Qualifications and experience
- Alligator Biosciences, advisory board member, National
- American Association for Cancer Research, National
- American College of Physicians, National
- American Society of Clinical Oncology, National
- American Society of Hematology, National
- Department of Defense (DOD) Pancreatic Cancer Research Program (PCARP), National
- Eastern Cooperative Oncology Group, National
- Eastern Cooperative Working Group Hepatopancreaticobiliary Working Group, National
- Geneos Therapeutics, National
- Natera, National
- National Cancer Institute Colon Cancer Task Force, National
- National Cancer Institute GI Steering Committee Circulating Tumor DNA Working Group, National
- Parker Center for Cancer Immunotherapy, National
- Parker Center for Cancer Immunotherapy Cellular Therapeutics Working Group, National
- Strike Pharma, Scientific Advisor, International
- Penn Gastrointestinal Cancer Program
- Penn Liver Cancer Program
Treatments and conditions
Research
Publications
Reiss KA, Xia M, Akamandisa M, D'Andrea K, Wubbenhorst B, Lord CJ, Pettitt SJ, Tutt ANJ, Brown TJ, O'Hara MH, Schneider C, Teitelbaum U, Hannan Z, Hood R, Tondon R, Vonderheide RH, Domchek SM, Nathanson KL. Long-Term Outcomes of Patients With BRCA+ or PALB2+ Pancreatic Cancer Treated With Maintenance Rucaparib: A Secondary Analysis of a Nonrandomized Clinical Trial , JAMA Oncol: 2026
Khalil DN, Gomez R, Regev A, Samaan F, Marouf Y, Budhu S, Hirschhorn D, Schulze I, Lavery JA, Ceglia N, Freeman SS, Maltez VI, Garcia JM, Suek N, Weng CH, Cabanski CR, Monette S, Romin Y, Li Y, Chaligne R, Yellin MJ, Keler T, Maurer DM, Flamar AL, Morgado-Palacin L, Mangarin LM, Harding JJ, Park W, Lyman JP, Maddock S, O'Hara MH, Abou-Alfa GK, Vonderheide RH, O'Reilly EM, Germain RN, Wolchok JD, Merghoub T. IL-10R inhibition induces neutrophil tumoricidal activity , Cancer Immunol Res: 2026
Till JE, Gal-Rosenberg O, Giliberto SG, Seewald NJ, Ballinger DG, Samberg HE, Yin MR, Wang QL, Cannas S, Kim KN, Tien K, Sawi M, Madineedi V, Furniss CS, Gocheva V, Nowak J, Brais LK, Yuan C, Rosenthal MH, Roses R, DeMatteo R, Lee MK, Vollmer C, Sagreiya H, O'Hara MH, Shemer R, Wolpin B, Dor Y, Carpenter EL. Plasma cell-free DNA markers predict occult metastases in patients with resectable pancreatic ductal adenocarcinoma , Clin Transl Med: 2026
O'Reilly EM, Cabanski CR, Lyman JP, Wainberg ZA, Fisher GA, Wolff RA, Ko AH, O'Hara MH, Spencer CN, Yu JX, Da Silva DM, Padrón LJ, Arnott J, Fairchild J, Moore JS, Peng B, Hoos WA, O'Donnell-Tormey J, Boffo S, Dugan U, Kimmelman AC, Amaravadi RK, Vonderheide RH. Clinical and translational results from a phase 1 trial of gemcitabine/nab-paclitaxel with nivolumab/ipilimumab or hydroxychloroquine/ipilimumab in untreated metastatic pancreatic adenocarcinoma , J Immunother Cancer, 14: 2026,e012864
Barber-Rotenberg JS, Haas AR, Aggarwal C, O'Hara M, Hexner E, Pequignot E, Dowd E, Ndeupen S, Thai E, Chen F, Oner BS, Czuczman C, Gonzalez VE, Fraietta JA, Hwang WT, Chew A, Jadlowsky JK, Marshall A, Shea KM, Jiang Y, Cosey A, Ferthio R, Levine BL, Plesa G, Siegel DL, Young RM, Sheppard NC, Albelda SM, June CH, Tanyi JL. Phase 1 study of autologous T cells bearing fully human chimeric antigen receptors targeting mesothelin in mesothelin-expressing cancers , Mol Ther: 2026
Aznar MA, Good CR, Barber-Rotenberg JS, Agarwal S, Wilson W, Watts A, Zhang Z, Gonzales D, Donahue G, Hwang WT, Rennels AK, Rech AJ, Kuramitsu S, Huang H, Glastad KM, Alexander KA, Plesa G, Dowd E, Brennan A, Siegel DL, Tanyi J, Haas A, Torigian DA, Nadolski G, Gonzalez VE, Hexner EO, Fraietta JA, Jadlowsky JK, Young RM, Berger SL, June CH, O'Hara MH. Clinical and molecular dissection of CAR T cell resistance in pancreatic cancer , Cell Rep Med: 2025
Amit U, Metz JM, Plastaras JP, Gheewala R, Teitelbaum U, Damjanov N, Vollmer C, Schneider CJ, Lee MK 4th, O'Hara M, Reiss-Binder K, Carpenter EL, Karasic TB, Konski A, Wileyto EP, Ben-Josef E. A phase 1 dual-dose escalation study of radiation and nab-paclitaxel in patients with unresectable and borderline resectable pancreatic cancer , Cancer, 131: 2025,e35936
Swami N, Hwang WT, Mamtani R, O'Hara MH, Chapin WJ. Second-Line Treatment Strategies for Right-Sided, RAS/RAF Wild-Type Colorectal Cancer , JAMA Netw Open, 8: 2025,e2515087
Rajdev L, King GG, Lieu CH, Cohen SA, Pant S, Uboha NV, Deming D, Malla M, Kasi A, Klute K, Spencer KR, Dasari A, Morris VK, Botta G, Lowy AM, O'Hara MH, Eads J, King D, Shah MA, Hong TS, Parikh A, Klempner SJ, Jabbour SK, Chawla A, Molena D, George TJ, Gibson MK, Allegra C, Goodman K, Eng C, Philip PA. Incorporating Circulating Tumor DNA Testing Into Clinical Trials: A Position Paper by the National Cancer Institute GI Oncology Circulating Tumor DNA Working Group , JCO Precis Oncol: 2025
Than MT, O'Hara M, Stanger BZ, Reiss KA. KRAS-Driven Tumorigenesis and KRAS-Driven Therapy in Pancreatic Adenocarcinoma. , Molecular Cancer Therapeutics, 23(10): 2024,1378 - 1388