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Golden State Radiation Oncology Data Breach Lawsuit Investigation
Shamis & Gentile P.A., one of the nation's premier class action law firms specializing in data breach cases, is investigating the Golden State Radiation Oncology data breach.
If you were affected by the data breach, your sensitive personally identifiable information may have been exposed, and you may be eligible for compensation.
About Golden State Radiation Oncology
Golden State Radiation Oncology Inc. is a healthcare organization based in Woodland Hills, California. The company specializes in radiation oncology services and is closely associated with the Golden State Cancer Center, which serves patients in the San Fernando Valley and Ventura County area.
The practice offers a range of advanced cancer treatment modalities, including stereotactic body radiotherapy, stereotactic radiosurgery, intensity-modulated radiation therapy, image-guided radiation therapy, 3D treatment planning and high dose rate brachytherapy. Their care team includes doctors, physicists, dosimetrists and radiation therapists.
What happened?
On June 13, 2025, Golden State Radiation Oncology learned from Integrated Oncology Network, a company that provides administrative services, that an email phishing incident that resulted in unauthorized access to patient information. The breach occurred between Dec. 13, 2024, and Dec. 16, 2024 when unauthorized parties accessed email and SharePoint accounts.
The data breach compromised both personally identifiable information (PII) and protected health information (PHI). Golden State Radiation Oncology disclosed the data breach to the U.S Department of Health and Human Services on June 27, 2025, reporting 2,130 patients impacted.
Information Exposed:
- Name
- Address
- Date of birth
- Social Security number
- Financial account information
- Diagnosis details
- Lab results
- Medication information
- Treatment information
- Health insurance and claims information
- Provider name
- Dates of treatment
Golden State Radiation Oncology posted a notice about the breach on their website and impacted individuals by mail. The cybersecurity incident was reported to the California Attorney General's office on July 15, 2025.
Your Rights and Next Steps
If you received a data breach notice from Golden State Radiation Oncology or Integrated Oncology Network, it is important to understand your rights. You may be entitled to seek compensation for any harm or inconvenience caused by this cybersecurity incident.
- Credit monitoring services: Sign up for free Epiq Privacy Solutions ID credit monitoring services offered.
- Monitor your accounts carefully: Check your financial statements regularly for suspicious activity or unauthorized transactions. If you notice anything unusual, contact your financial institution immediately.
- Fraud alert and credit reports: A fraud alert informs creditors to take extra steps to verify your identity before opening new accounts in your name. Consumers are also entitled to one free credit report annually from each credit bureau. You can request a fraud alert or a credit report by contacting any one of the three major credit bureaus.
- Seek legal help: Lawyers are ready to help you understand your rights and pursue compensation.
Lawyers are ready to help you understand your rights and guide you through the process of joining a class action lawsuit.
You May Be Entitled to Compensation
If your information was exposed in this data breach, you may have the right to seek compensation, which can include reimbursement for out-of-pocket expenses, time spent addressing the breach, or payment for emotional distress. Lawyers are ready to help individuals affected by this breach pursue claims.
To find out if you qualify and to join a potential lawsuit, complete the form below.
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