Inverventional Radiation Oncology of California

Pioneering Comprehensive Oncology Care for Every Patient

At IROC, we are dedicated to providing exceptional oncology services, combining Medical, Radiation, and Surgical expertise.
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THE IROC Difference

Independent. Integrated.
Intentional.

We empower physicians with the freedom to practice independently while ensuring
access to integrated care. Our strong hospital relationships and state-of-the-art equipment
enhance patient outcomes and professional satisfaction.

IROC brings together Surgical, Medical, and Radiation Oncologists under one physician-led group — offering patients and peers complete, coordinated cancer care.

We’ve built long-standing relationships in the communities we serve, including strong partnerships with hospitals that help us create better systems for treating patients.

IROC is independently governed by physicians and equipped with advanced tools like adaptive radiotherapy and diagnostic imaging — giving our team what they need to deliver high-quality care.

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Our Team

Physicians Shaping the Future of Oncology Care

Led by a team of experienced specialists, IROC brings together leaders in Medical, Surgical,
and Radiation Oncology—all committed to patient-centered care and professional collaboration.
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Rizwan Nurani, M.D.

Martin Majer, M.D.

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INNOVATION

Breakthrough Oncology Technology to Enhance Precision and Confidence

Our physicians work with advanced treatment and diagnostic platforms—supporting
better planning, adaptive therapy, and high-impact outcomes for patient recovery.
TREATMENT

Ethos 2.0 with Hypersight

Ethos therapy is our Al-driven holistic solution that lets you choose the most appropriate treatment option based on daily changes in patient anatomy. It also delivers an entire adaptive treatment in a typical 15-minute timeslot, from setup through delivery.

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Trusted by Our Hospital Partners Nationwide
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“Absolutely love the service and all the staff! Great Doctor with a great team. Patient care is #1 at this office.” 

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“Absolutely love the service and all the staff! Great Doctor with a great team. I have had a very good experience with everyone I have come into contact with in this office. Patient care is #1 at this office.”

MaryLou
Patient
MaryLou
Patient
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“I cannot speak highly enough of Dr. Nurani and his team. Anyone dealing with cancer wants an environment that combines the confident assurance that you are getting state-of-the-art medical treatment with a staff that treats you with warmth, dignity and respect.”

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“I cannot speak highly enough of Dr. Nurani and his team. Anyone dealing with cancer wants an environment that combines the confident assurance that you are getting state-of-the-art medical treatment with a staff that treats you with warmth, dignity and respect. From the moment I walked in to Dr. Nurani’s office, I felt like I was getting world class care from a group of people who were on my side. The office is very comfortable and the staff is very efficient.”

Kyle
Patient
Kyle
Patient
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“The skill, professionalism, knowledge and staff are truly amazing. I must say the best level of service I have ever received.”

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“The skill, professionalism, knowledge and staff are truly amazing. I must say the best level of service I have ever received. I always had a high level of confidence the technical staff all were highly skilled.”

Keith
Patient
Keith
Patient
At doctor

“Dr. Osgood is an excellent surgeon, he is kind and compassionate, and very knowledgeable. He answered all my questions in detail.”

Kerri
Patient
Friendly male doctor reassuring the patient and holding his hands

“Dr. Osgood was very knowledgeable, took his time explaining everything to myself & my family members that came with me!”

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“Dr. Osgood was very knowledgeable, took his time explaining everything to myself & my family members that came with me! He is also kind & compassionate from every office visit, to the hospital, post surgery and follow up appointments. I’d highly recommend him to anyone that needs this care.”

Marti
Patient
Marti
Patient
Compassionate female doctor nurse supporting consoling aged retired man patient

My father is 80 years old and has advanced state 4 prostrate cancer and was referred to Dr. Nurani.  Not only is he the best at what he does, he cares and cares deeply about his patients.

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“Look, cancer is never easy to deal with. My father is 80 years old and has advanced state 4 prostrate cancer and was referred to Dr. Nurani.  Not only is he the best at what he does, he cares and cares deeply about his patients. Dr. Nurani is up on all the latest research in treating the disease and is patient and willing to explain the pros and cons of each, while ensuring the plan is right for the patient AND the family.  All of the specialists recognize the extraordinary care that my father has received during his time under Dr. Nurani.”

Omar
Family of Patient
Omar
Family of Patient