About BASS Cancer Center

BASS Cancer Center is a part of BASS Medical Group, a multi-specialty medical group with more than 400 providers and 40 specialties in the Bay Area and Central Valley. BASS is teaming up with leading oncology partners to provide comprehensive, compassionate, and personalized cancer care to the San Francisco Bay Area by way of our state-of-the-art Walnut Creek facility.

The BASS Promise

Exceptional Care through
Extraordinary Technologies

The BASS Cancer Center is a medical facility that offers patients with cancer, and their families, the highest level of care through cutting-edge technology. We offer state-of-the art treatment options to improve your quality of life and provide you with peace of mind during this difficult time in your life. Our expert providers are committed to providing exceptional care by using extraordinary technologies for our patients who trust us with their cancer treatments.

Our Leadership Team

We're here to serve you.

Inez Wondeh

Chief Executive Officer
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Ramona Parvaneh

Executive Vice President
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Dr. Kenneth Chao

Radiation Oncologist & Medical Director
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Jesse Kaestner, BS, RT(T)

Director, Cancer Center
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Bryanna Ballard, BS, RT(T)

Chief Radiation Therapist
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Dr. JB Zhang, PhD

Director of Medical Physics and Dosimetry
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Our Cancer Doctors

Patient Centric Cancer Care Starts with Great Doctors

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Dr. Kenneth Chao

Radiation Oncologist and Medical Director
Specializing in Radiation Oncology
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Dr. Steven Kurtzman

Radiation Oncology
Specializing in Radiation Oncology
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Dr. Soheila Azghadi

Radiation Oncology
Specializing in Radiation Oncology
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Dr. James Mitchell

Radiation Oncology
Specializing in Radiation Oncology
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Dr. Tyler Kang

Medical Oncology
Specializing in Radiation Oncology
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Dr. Ethan Schram

Medical Oncology
Specializing in Radiation Oncology
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Dr. Ari Umutyan

Medical Oncology
Specializing in Radiation Oncology
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Rachelle "Shell" Portner, RN, BSN, BA

Rachelle “Shell” Portner
Specializing in Radiation Oncology
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Dr. Jewel Johl

Medical Oncology
Specializing in Radiation Oncology
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Dr. Vickie Nguyen

PharmaD
Specializing in Radiation Oncology
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Dr. Heidi Chang

Gynecologic Oncologist
Specializing in Radiation Oncology
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Dr. Dimitry Lerner

Gynecologic Oncologist
Specializing in Radiation Oncology
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Dr. Stephen Wells

Obstetrics and Gynecology
Specializing in Radiation Oncology
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Dr. Timothy Leach

Obstetrics and Gynecology
Specializing in Radiation Oncology
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Dr. Jonathan L. Chin

Urologist
Specializing in Radiation Oncology
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Dr. Brian D. Hopkins

Urologist
Specializing in Radiation Oncology
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Dr. Kenneth Hsiao

Urologist
Specializing in Radiation Oncology
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Dr. Dawud Lankford

Urologist
Specializing in Radiation Oncology
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Dr. Andrew Smith

Urologist
Specializing in Radiation Oncology
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Dr. C. Charles Wen

Urologist
Specializing in Radiation Oncology
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Dr. Christopher Welty

Urologist
Specializing in Radiation Oncology
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Dr. Shu Pan

Urologist
Specializing in Radiation Oncology
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Dr. Alex A. Aslan

Gastroenterologist
Specializing in Radiation Oncology
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Dr. Huilan Cheng

Gastroenterologist
Specializing in Radiation Oncology
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Dr. Lisa Higa

Gastroenterologist
Specializing in Radiation Oncology
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Dr. Mehra Hosseini

Gastroenterologist
Specializing in Radiation Oncology
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Dr. Jenny F. Jew

Gastroenterologist
Specializing in Radiation Oncology
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Dr. V. Arek Keledjian

Gastroenterologist
Specializing in Radiation Oncology
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Dr. Cynthia Mullen

Gastroenterologist
Specializing in Radiation Oncology
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Dr. Kalyani Maganti

Gastroenterologist
Specializing in Radiation Oncology
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Dr. Subhendu Narayan

Gastroenterologist
Specializing in Radiation Oncology
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Dr. F. Anderson Rowe

Gastroenterologist
Specializing in Radiation Oncology
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Dr. Rishi Sharma

Gastroenterologist
Specializing in Radiation Oncology
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Dr. Salim Shelby

Gastroenterologist
Specializing in Radiation Oncology
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Dr. Philip C. Yee

Gastroenterologist
Specializing in Radiation Oncology
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Dr. Ran S. Kim

Colorectal Cancers
Specializing in Radiation Oncology
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Dr. Brian J. McGuinness

Colorectal Cancers Specializing in Radiation Oncology Read Bio

Dr. Negar M. Salehomoum

Colorectal Cancers
Specializing in Radiation Oncology
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Dr. Poornima Vanguri

Colorectal Cancers
Specializing in Radiation Oncology
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Dr. Rupert Horoupian

Colorectal Cancers
Specializing in Radiation Oncology
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Dr. Mary K. Cardoza

Breast Cancer
Specializing in Radiation Oncology
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Dr. Elizabeth Cunningham

Breast Cancer
Specializing in Radiation Oncology
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Dr. Danielle Bertoni

Breast Cancer
Specializing in Radiation Oncology
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Sabrina Torres, PA

Sabrina Torres
Specializing in Radiation Oncology
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Dr. Michaela Straznicka

Thoracic Surgical Oncologist
Specializing in Radiation Oncology
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Dr. Wilson S. Tsai

Thoracic Surgical Oncologist
Specializing in Radiation Oncology
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Dr. Jennifer Chan

Thoracic Cancers
Specializing in Radiation Oncology
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Dr. Maxwell B. Merkow

Neurological Surgeon
Specializing in Radiation Oncology
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Dr. Joshua Au

Head and Neck Cancers
Specializing in Radiation Oncology
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Dr. Ajay Upadhyay

Surgical Oncologist
Specializing in Radiation Oncology
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Dr. Steven Stanten

Surgical Oncologist
Specializing in Radiation Oncology
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Dr. Teresa Kim

Surgical Oncologist
Specializing in Radiation Oncology
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Dr. Rockson Liu

Surgical Oncologist
Specializing in Radiation Oncology
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