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To provide world class, quality care while delivering on unparalleled patient experience.

Welcome to the KSK Cancer Center of Irvine (CCOI) a privately owned comprehensive medical center which offers top quality treatment and care from our finest medical faculty; handpicked for their expertise, years of experience and quality of care. Our dedicated team of experts are deeply involved in innovative cancer treatments, revolutionary cancer research, and patient education. CCOI also works closely with many well-respected physicians in our community and across the country to ensure the best patient care.

CCOI offers the highest quality cutting edge Radiation Oncology treatments for various cancers. We specialize in external beam radiotherapy, brachytherapy, administration of radioactive unsealed sources, and various other cancer treatments.  We are highlighted by our expertise internationally in both prostate and breast cancer treatment. CCOI also has an extensive background in treating many other areas such as lung, gastrointestinal, genitourinary, gynecological, skin, brain and palliative cases. Our cure rates remain among the best in the country.                     

KSK Cancer Center of Irvine is truly devoted to patients & their families!  


“I can recommend the Cancer Center of Irvine very highly.  My wife and I have been very impressed with my entire treatment.  Drs. Tokita and Yeh are outstanding and are always available for a consultation and to answer your questions.  The staff is very professional, efficient, well teamed, and knowledgeable.  They care about the patient and the patients comfort.  I could always get answers to any of my question.  I dreaded the long drive from my home to Irvine, every day for my treatment but, very soon, I felt it was definitely worth it to have such excellent treatment here.” – Jay

“We want to thank each and every person in this office for saving my husband’s life.  You are a wonderful credit to Dr. Tokita, the man responsible for helping so many.  We will be forever grateful for having this experience and will cherish being of the “family.”  Thank you again.  You will always be in our thought and prayers!!”  Love Judy

“I very much appreciate the outstanding medical treatment that I have been receiving at your facility.  You have a staff that is not only well trained but also extremely concerned with patient satisfaction.  On top of this, they are very courteous.” – Ken

“Your entire Team is absolutely amazing!  Up Beat, smiling, polite, caring, great sense of humor, courteous….so many consistent qualities making my visits most comfortable & pleasant.  Thank you!” - Michael

“…You took what is a somewhat scary journey and made it an exciting adventure…Thanks a million!” - Ron


Greet-The-Day Spa Treatment For Our Female Patients

Every quarter year, we are fortunate to provide a spa day for 2 current or past patients that have had treatment at our center. The complimentary spa and lunch grants female patients the opportunity to socialize with other women that have been treated with various modalities of cancer care in the Orange County area. Please inquire within to sign up for our waiting list to attend the heartwarming event!

Radiation Therapy 101

What is Radiation Therapy?

Radiation Therapy is the medical use of ionizing radiation as part of cancer treatment to control cancer cells.


Varian 23 iX with OBI imaging

Uses of Radiation Therapy:

Radiation Therapy can be used for the primary course of treatment or in conjunction with surgery and/or chemotherapy. Depending on diagnosis and staging, radiation therapy is used for curative or palliative purposes.

Read more: Radiation Therapy 101