We Are Interventional Radiation Oncology of California

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.

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.

Rizwan Nurani, M.D.

Geoffrey D. Osgood II, M.D.

Donald Lombardi, M.D.

Brad Sackfield, M.D.

Joanne Arnold, ANP-C

Ping S. Chu, Ph.D, M.D.

Masoom M. Kandahari, M.D., FACP

Rizwan Nurani, M.D.

Rizwan Nurani, M.D.

President of Oncology Services

M.D. University of Washington School of Medicine, Seattle, WA

Residency University of Washington, Seattle, WA

“We’re committed to transforming the management of cancer through a comprehensive team approach, with the patient at the head.”
Geoffrey D. Osgood II, M.D.

Geoffrey D. Osgood II, M.D.

Breast Cancer Specialist

Medical school MD, Wayne State University. Detroit, Michigan

Residency General Surgery, University of California, Riverside. Riverside, California

Fellowship Breast Surgical Oncology, University of Arkansas for Medical Sciences UAMS. Little Rock, Arkansas

Dr. Osgood II takes a personalized, compassionate approach to breast cancer care, combining cutting-edge technology with deep clinical expertise. He integrates ultrasound into his practice for real-time precision, and uses oncoplastic techniques to optimize both cancer and cosmetic outcomes. Committed to staying current with the latest literature, Dr. Osgood II delivers evidence-based care tailored to each patient. Known for his exceptional bedside manner, he builds trusting relationships with his patients and truly invests in their outcomes- both physical and emotional.

“My goal is to treat each patient the way I would want a family member to be treated- with compassion, clear communication, and with the latest advances in breast cancer treatment.”
Donald Lombardi, M.D.

Donald Lombardi, M.D.

Director of Medical Oncology

MD University of Rochester School of Medicine & Dentistry Rochester, New York

Residency University of Michigan, Ann Arbor, MI

Medical Oncology Fellowship National Cancer Institute, Bethesda, MD

“When I walk into a patient’s exam room, I bring all of me to all of her or him. The cancer journey may be rough at times, but I will always be with you, every step of the way.”
Brad Sackfield, M.D.

Brad Sackfield, M.D.

Medical Oncology

M.D. Saint James School of Medicine, Saint Vincent and the Grenadines

Residency Hamilton Medical Center Internal Medicine Residency Program, Dalton GA

Medical Oncology Fellowship East Tennessee State University, Johnson City, TN

“Every patient’s journey with cancer is deeply personal, and I believe their care should be, too. My approach combines evidence-based medicine with compassion and a commitment to truly listening. In Redding, I look forward to building trusted relationships and tailoring treatment plans that honor the unique needs and values of each individual I have the privilege to care for.”
Joanne Arnold, ANP-C

Joanne Arnold, ANP-C

Oncology Services

Masters of Science, Adult Nurse Practitioner, SUNY Stony Brook University, Stony Brook, NY.

“As an oncology provider I try to see the patient and loved ones as one. Including the patient and family unit helps me make more attentive companionate decisions.”
Ping S. Chu, Ph.D, M.D.

Ping S. Chu, Ph.D, M.D.

Board Certified Medical Oncology

M.D. University of Miami, School of Medicine, Coral Gables, Florida

Ph.D Department of Chemistry, Massachusetts Institute of Technology, Cambridge Massachusetts

Residency Beth Israel Medical Center, New York, N.Y.

Medical Oncology fellowship M. D. Anderson Cancer Center, University of Texas, Houston, Texas
Masoom M. Kandahari, M.D., FACP

Masoom M. Kandahari, M.D., FACP

Board Certified Medical Oncology and Hematology

M.D. All India Institute of Medical Sciences, New Delhi, India

Residency New Rochelle Hospital Medical Center, New York, New York

Hematology/Oncology Fellowship University of Pittsburgh, Pittsburgh, Pennsylvania

Oncology Fellowship Albert Einstein College of Medicine, Bronx, New York

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.

Specification Sheet

Treatment

Edge Radiosurgery System

The Edge system represents an evolution in how radiosurgery is delivered, enabling the doctor to perform non-invasive, ablative intracranial and extracranial radiosurgery treatments in addition to highly precise radiotherapy treatments across a range of clinical indications. This allows effective, precise, and flexible treatment of a wide variety of cancers to help achieve unmatched clinical care and to give the patient more time away from treatment.

Specification Sheet

Edge-with-couch-beauty-shot-1-high-res-min

Treatment

SCOUT® Radar Localization System

SCOUT is a wire-free localization system that is used for breast and soft tissue localization, before or after neoadjuvant chemotherapy, and to mark a biopsy site. The SCOUT reflector has a clinically insignificant MRI artifact. It does not interfere with MRI studies, so there is no restriction on the imaging modalities that can be used effectively throughout treatment making it the preferred localization to treat more patients.

Trusted by Our Hospital Partners Nationwide

“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

“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

“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

“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

Pioneering Comprehensive Oncology Care for Every Patient

Independent. Integrated.
Intentional.