Where does the Golden State Radiation Oncology case file come from?

Every entry is taken from the breach report Golden State Radiation Oncology lodged with the California Attorney General. Nothing here is estimated.

Why do the incident date and the report date differ?

Companies usually investigate before they report. The gap between the two dates shows how long that took.

What does the records-affected figure count?

It is the number the company gave the state. It can cover residents of that state only, so the national total may be higher.

Does this case file change over time?

Yes. When a company files an update or a new state publishes its copy of the report, the dates and counts here are refreshed.

Case file

Case File: Golden State Radiation Oncology Data Breach

This file collects the dated facts on record for the Golden State Radiation Oncology incident. The state report is dated July 15, 2025. The incident itself is dated December 13, 2024.

Timeline

214 days separate the incident date from the date it was reported.

December 13, 2024Incident dateWhen the filing says the breach took place.
July 15, 2025Report filed in CaliforniaDate the notice was lodged with the California Attorney General.

Case facts

Filing state: California
Date reported: July 15, 2025
Incident date: December 13, 2024
Receiving office: California Attorney General

Case notes

Golden State Radiation Oncology, based in California, has submitted a formal data breach notification to state authorities. The report, filed on July 15, 2025, addresses an security incident that is currently under active investigation by the organization.

The breach event itself reportedly took place on December 13, 2024. While the specific types of personal information involved were not detailed in the public filing, the company is actively working to understand the full scope of the compromise.

At present, the number of individuals affected by this incident remains unspecified in the available public records. Golden State Radiation Oncology has indicated that their investigation is ongoing to determine the extent of the data exposure and identify affected parties.

Individuals who may have been impacted by this breach are advised to monitor their personal accounts and statements for any suspicious activity. It is always a good practice to be cautious of unsolicited communications, especially those requesting personal or financial details.

As the investigation proceeds, additional details may be released by Golden State Radiation Oncology or state regulators. This filing serves as an official acknowledgment of the incident as required by state law.

Questions about this case file

Where does the Golden State Radiation Oncology case file come from?: Every entry is taken from the breach report Golden State Radiation Oncology lodged with the California Attorney General. Nothing here is estimated.
Why do the incident date and the report date differ?: Companies usually investigate before they report. The gap between the two dates shows how long that took.
What does the records-affected figure count?: It is the number the company gave the state. It can cover residents of that state only, so the national total may be higher.
Does this case file change over time?: Yes. When a company files an update or a new state publishes its copy of the report, the dates and counts here are refreshed.

California data breaches

Filing source: California Attorney General

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Timeline

Case facts

Case notes

Questions about this case file

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