Understanding your Golden State Radiation Oncology data breach notification letter
If a Golden State Radiation Oncology letter arrived in your mailbox, here is what it means, why you received it, and the free steps you can take right now.
Why you received this letter
Golden State Radiation Oncology is a specialized healthcare provider focused on cancer treatment and radiation therapy services. As a medical facility, the organization maintains highly sensitive patient records, including detailed clinical histories, diagnostic imaging, and insurance billing information. In 2025, the company officially reported a data security incident to the California Attorney General, confirming that unauthorized access to their systems occurred. If you have received a formal data breach notification letter from the organization, it indicates that your personal or protected health information was likely contained within the impacted files. This notice is intended to inform you of the incident, the steps the provider is taking to secure their network, and the resources available to help you protect your identity and medical privacy.
What to do after the letter
Confirm the notice is genuine
A legitimate Golden State Radiation Oncology notice references the specific incident reported to the California Attorney General and describes which categories of your information were involved. Compare the letter against the public filing before acting on any links or phone numbers it contains.
Keep the letter — it is your proof of connection
The notification letter is the document that ties your personal information to this incident. Keep the original and photograph it. If you later request a case review, this letter is the strongest evidence that you were among the affected individuals.
Protect your accounts and credit
Depending on what was exposed, consider a free credit freeze with all three bureaus, new passwords for reused credentials, and monitoring of financial statements. These steps are free and do not require you to wait for anyone's permission.
Check the record against the public filing
You can verify the Golden State Radiation Oncology incident against the filing reported to the California Attorney General. This registry summarizes what was filed; it does not provide legal advice.
This page summarizes a data breach reported to the California Attorney General for informational purposes. DataBreachInformation.com is a neutral reference registry and does not provide legal advice.