Meet our Orange County Physician Scientists

In opening its visionary comprehensive cancer center in Orange County, City of Hope is creating a national model for delivering breakthrough research and pioneering treatments. Welcome to City of Hope Orange County Lennar Foundation Cancer Center – the most advanced comprehensive cancer center in Orange County. Here, patients receive fully integrated, multidisciplinary cancer care — from prevention through survivorship — in one convenient location. Orange County residents can now access world-renowned treatment, research and cancer cures close to home.

Meet some of the world’s most acclaimed physician-scientists — with expertise in lung, breast, gastrointestinal, gynecological, genitourinary, blood cancers and more – assembled from across the country. They’re leading next-level cancer treatment and research.
CIty of Hope Orange County Lennar Foundation Cancer Center
Mouchammed Agko, M.D.
Assistant Clinical Professor, Division of Plastic Surgery, Department of Surgery
Duarte - Main Campus; Lennar Foundation Cancer Center

Plastic surgeon Mouchammed Agko, M.D., understands that many cancer survivors want to continue their lives after treatment without physical reminders of the disease. His goal is to help them achieve that — in addition to providing additional aesthetic improvements, if it meets a patient’s needs.

Ibrahim Aldoss
Ibrahim T. Aldoss, M.D.
Hematologist-Oncologist
Duarte - Main Campus; Lennar Foundation Cancer Center

Ibrahim T. Aldoss, M.D., is a hematologist-oncologist and board certified in internal medicine, medical oncology and hematology. His clinical expertise is in acute lymphoblastic leukemia and acute myeloid leukemia.

Haris Ali
Haris Ali, M.D.
Hematologist-Oncologist
Duarte - Main Campus; Lennar Foundation Cancer Center

Haris Ali, M.D., is an hematologist-oncologist and associate professor in the department of Hematology & Hematopoietic Cell Transplantation.

Nairi Berner, M.D.
Lennar Foundation Cancer Center

Nairi Berner, M.D., is an Assistant Clinical Professor, Department of Diabetes, Endocrinology & Metabolism.

Tanuja Bhandari
Tanuja A. Bhandari, M.D.
Radiation Oncologist
Providence Saint Joseph of Orange Radiation Oncology; Lennar Foundation Cancer Center

Tanuja Bhandari, M.D., is a radiation oncologist at City of Hope who is well-versed in all forms of radiation oncology, including intraoperative radiation therapy.

Lennar Foundation Cancer Center

Azra Borogovac, M.D., M.S., is a hematologist at City of Hope Orange County Lennar Foundation Cancer Center. For Dr. Borogovac, the patient is the most important part of the medical team. She sees the opportunity to provide care to people with cancer as a privilege. 

Luke Chen, M.D.
Medical Oncologist and Hematologist
Lennar Foundation Cancer Center; Seacliff

Luke Chen, M.D., is a medical oncologist and hematologist at City of Hope's Huntington Beach and Irvine Sand Canyon locations. Dr. Chen’s research has explored ways to improve treatment for prostate cancer and other malignancies.

Lennar Foundation Cancer Center

Jennifer Chen M.D., is a Lead Breast Imager and Assistant Clinical Professor, Department of Diagnostic Radiology at City of Hope Orange County.

Jessica Cheng, M.D.
Lennar Foundation Cancer Center

Jessica Cheng, M.D., is among the nation’s few, and Orange County’s only, fellowship-trained experts in cancer rehabilitation medicine. This is a subspecialty of physical medicine and rehabilitation (PM&R) also known as physiatry.

Meet Dr. Seth A. Cohen
Seth A. Cohen, M.D.
Urologic Surgeon; Urogynecologist
Newport Beach; Lennar Foundation Cancer Center

Seth Cohen, M.D., is a urologic surgeon with a focus on female pelvic medicine and reconstructive surgery at City of Hope's community practice sites in Orange County.

Huntington Beach Clinic
Lennar Foundation Cancer Center; Huntington Beach; Newport Beach; Seacliff

Joshua G. Cohen, M.D., F.A.C.O.G., F.A.C.S., is a board-certified gynecologic oncologist dedicated to offering his patients in Orange County empathy and excellence in clinical care.

Sudarsan Vishnu Kollimuttathuillam, M.D.
Medical Oncologist and Hematologist
Huntington Beach; Lennar Foundation Cancer Center; Seacliff

Sudarsan Vishnu Kollimuttathuillam, M.D., is a medical oncologist and hematologist at City of Hope's Huntington Beach and Irvine Sand Canyon locations. Dr. Kollimuttathuillan places a priority on offering his patients access to innovative treatments and clinical trial options.

Christian C. Lu, M.D., M.H.S.
Christian C. Lu, M.D., M.H.S.
Assistant Clinical Professor
Long Beach Elm; Huntington Beach; Sand Canyon; Long Beach Worsham; Newport Beach

Christian Co Lu, M.D., M.H.S., is a patient-centric physician with 15+ years of experience in medical care. 

Danny Nguyen, M.D.
Medical Oncologist and Hematologist
Lennar Foundation Cancer Center; Huntington Beach; Seacliff

Danny Nguyen, M.D., is a medical oncologist and hematologist at City of Hope's Huntington Beach and Irvine Sand Canyon locations. Dr. Nguyen is also an assistant clinical professor in the Department of Medical Oncology & Therapeutics Research.

Nishan Tchekmedyian, M.D.
Medical Oncologist and Hematologist
Lennar Foundation Cancer Center; Huntington Beach; Seacliff

Nishan Tchekmedyian, M.D., is a hematologist and medical oncologist at City of Hope's Huntington Beach, Irvine Sand Canyon, and Newport Beach Lido locations.

Nerses Simon Tchekmedyian, M.D., FACP
Medical Oncologist and Hematologist
Lennar Foundation Cancer Center; Huntington Beach; Long Beach Elm; Seacliff

Nerses Simon Tchekmedyian, M.D., FACP, is a medical oncologist and hematologist at City of Hope's Huntington Beach, Irvine Sand Canyon, Long Beach Elm locations. Dr. Tchekmedyian is also a clinical professor in the Department of Medical Oncology & Therapeutics Research.

Sand Canyon Clinic
Christian C. Lu, M.D., M.H.S.
Christian C. Lu, M.D., M.H.S.
Assistant Clinical Professor
Long Beach Elm; Huntington Beach; Sand Canyon; Long Beach Worsham; Newport Beach

Christian Co Lu, M.D., M.H.S., is a patient-centric physician with 15+ years of experience in medical care. 

Headshot of Nikki Zahabi, D.O.
Nikki Zahabi, D.O.
Assistant Clinical Professor, Department of Medicine
Sand Canyon; Long Beach Worsham

Nikki Zahabi, D.O., is an assistant clinical professor with a strong background in internal medicine and critical care in the Department of Medicine at City of Hope in Duarte, California.

Newport Beach Clinic
Monzr M. Al Malki, M.D.
Monzr M. Al Malki, M.D.
Hematologist-Oncologist
Duarte - Main Campus; Newport Beach

Monzr M. Al Malki, M.D., is an associate professor in the Department of Hematology & Hematopoietic Cell Transplantation and is board certified in internal medicine, hematology and medical oncology at City of Hope.

Meet Dr. Seth A. Cohen
Seth A. Cohen, M.D.
Urologic Surgeon; Urogynecologist
Newport Beach; Lennar Foundation Cancer Center

Seth Cohen, M.D., is a urologic surgeon with a focus on female pelvic medicine and reconstructive surgery at City of Hope's community practice sites in Orange County.

Lennar Foundation Cancer Center; Huntington Beach; Newport Beach; Seacliff

Joshua G. Cohen, M.D., F.A.C.O.G., F.A.C.S., is a board-certified gynecologic oncologist dedicated to offering his patients in Orange County empathy and excellence in clinical care.

Doctor Misagh Karimi
Misagh Karimi, M.D.
Medical Oncologist and Hematologist
Lennar Foundation Cancer Center; Newport Beach

Misagh Karimi, M.D., is a medical oncologist who is passionate about patient education, appearing frequently at community forums to discuss obesity, the environment and other possible risk factors for cancer.

Amrita Krishnan, M.D.
Lennar Foundation Cancer Center; Newport Beach

Amrita Krishnan, M.D., directs the Judy and Bernard Briskin Center for Multiple Myeloma Research at City of Hope's cancer research hospital, seeking to make gains in one of the most rapidly changing areas in cancer research.

Christian C. Lu, M.D., M.H.S.
Christian C. Lu, M.D., M.H.S.
Assistant Clinical Professor
Long Beach Elm; Huntington Beach; Sand Canyon; Long Beach Worsham; Newport Beach

Christian Co Lu, M.D., M.H.S., is a patient-centric physician with 15+ years of experience in medical care. 

Hoda Pourhassan, M.D
Hoda Pourhassan, M.D.
Hematologist-Oncologist
Duarte - Main Campus; Newport Beach; West Covina

Hoda Pourhassan, M.D., is a hematologist-oncologist in the Department of Hematology & Hematopoietic Cell Transplantation at City of Hope.

George Semeniuk III, M.D.
George Bernard Semeniuk, III, M.D.
Medical Oncologist and Hematologist
Newport Beach; Lennar Foundation Cancer Center

George Bernard Semeniuk, III, M.D., is a hematologist/oncologist specializing in leukemia, lymphoma and hematopoietic cell transplantation.

Wade Smith, M.D.
Wade Smith, M.D.
Medical Oncologist and Hematologist
Newport Beach; Duarte - Main Campus; Lennar Foundation Cancer Center

Wade Smith, M.D., is a medical oncologist specializing in breast cancer at City of Hope Orange County and Duarte.

Dr.Tin Tang  profile image
Tingting Tan, M.D., Ph.D.
Medical Oncologist and Hematologist
Newport Beach; Duarte - Main Campus

Tingting Tan, M.D., Ph.D., is a medical oncologist and assistant clinical professor in the Department of Medical Oncology & Therapeutics Research at City of Hope.

Long Beach Elm Clinic
Sassan Farjami, M.D.
Medical Oncologist and Hematologist
Long Beach Elm; Long Beach Worsham

Sassan Farjami, M.D., is a hematologist and medical oncologist at City of Hope's Long Beach Elm and Long Beach Worsham locations. Dr. Farjami is also an associate clinical professor in the Department of Medical Oncology & Therapeutics Research.

Christian C. Lu, M.D., M.H.S.
Christian C. Lu, M.D., M.H.S.
Assistant Clinical Professor
Long Beach Elm; Huntington Beach; Sand Canyon; Long Beach Worsham; Newport Beach

Christian Co Lu, M.D., M.H.S., is a patient-centric physician with 15+ years of experience in medical care. 

Karla-Olmedo
Karla Olmedo, M.D.
Hematologist-Oncologist
Long Beach Elm; Long Beach Worsham
Nerses Simon Tchekmedyian, M.D., FACP
Medical Oncologist and Hematologist
Lennar Foundation Cancer Center; Huntington Beach; Long Beach Elm; Seacliff

Nerses Simon Tchekmedyian, M.D., FACP, is a medical oncologist and hematologist at City of Hope's Huntington Beach, Irvine Sand Canyon, Long Beach Elm locations. Dr. Tchekmedyian is also a clinical professor in the Department of Medical Oncology & Therapeutics Research.

Lihong Wu, M.D.
Medical Oncologist and Hematologist
Long Beach Elm; Long Beach Worsham

Lihong Wu, M.D., is a medical oncologist and hematologist at City of Hope's Long Beach Elm and Worsham locations. Dr. Wu has made it her mission to help others triumph over cancer. She prides herself on being there for her patients and finding the best possible treatments for them.

Long Beach Worsham Clinic
Sassan Farjami, M.D.
Medical Oncologist and Hematologist
Long Beach Elm; Long Beach Worsham

Sassan Farjami, M.D., is a hematologist and medical oncologist at City of Hope's Long Beach Elm and Long Beach Worsham locations. Dr. Farjami is also an associate clinical professor in the Department of Medical Oncology & Therapeutics Research.

Christian C. Lu, M.D., M.H.S.
Christian C. Lu, M.D., M.H.S.
Assistant Clinical Professor
Long Beach Elm; Huntington Beach; Sand Canyon; Long Beach Worsham; Newport Beach

Christian Co Lu, M.D., M.H.S., is a patient-centric physician with 15+ years of experience in medical care. 

Andrew Nguyen, M.D.
Andrew Nguyen, M.D.
Surgical Oncologist
South Bay; Long Beach Worsham

Specializing in bioengineering and tumor micro-environment in cancer development and progression, Andrew Nguyen, M.D., is an assistant clinical professor in the Division of Surgical Oncology in the Department of Surgery at City of Hope.

Karla-Olmedo
Karla Olmedo, M.D.
Hematologist-Oncologist
Long Beach Elm; Long Beach Worsham
Lihong Wu, M.D.
Medical Oncologist and Hematologist
Long Beach Elm; Long Beach Worsham

Lihong Wu, M.D., is a medical oncologist and hematologist at City of Hope's Long Beach Elm and Worsham locations. Dr. Wu has made it her mission to help others triumph over cancer. She prides herself on being there for her patients and finding the best possible treatments for them.

Headshot of Nikki Zahabi, D.O.
Nikki Zahabi, D.O.
Assistant Clinical Professor, Department of Medicine
Sand Canyon; Long Beach Worsham

Nikki Zahabi, D.O., is an assistant clinical professor with a strong background in internal medicine and critical care in the Department of Medicine at City of Hope in Duarte, California.