Where does the Marin Cancer Care case file come from?

Every entry is taken from the breach report Marin Cancer Care 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: Marin Cancer Care Data Breach

This file collects the dated facts on record for the Marin Cancer Care incident. The state report is dated April 23, 2026. The incident itself is dated November 22, 2025.

Timeline

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

November 22, 2025Incident dateWhen the filing says the breach took place.
April 23, 2026Report filed in CaliforniaDate the notice was lodged with the California Attorney General.

Case facts

Filing state: California
Date reported: April 23, 2026
Incident date: November 22, 2025
Receiving office: California Attorney General

Case notes

Marin Cancer Care, located in California, has reported a data security incident that took place on November 22, 2025. Public notice of this event was filed on April 23, 2026, indicating a delay between the breach occurrence and its official disclosure.

The specific nature of how this breach occurred remains unspecified in the available records. Furthermore, the exact categories of personal information affected by this incident have not been detailed. Therefore, affected individuals should be aware that some of their personal data may have been compromised.

As of the filing date, the incident is still under investigation. Marin Cancer Care is working to understand the full scope and impact of the event. Additional details may become available as their investigation progresses.

For those concerned about their personal information, general protective measures are advisable. These include monitoring account statements for unusual activity, being wary of unsolicited communications, and considering placing a fraud alert on credit reports. Remaining vigilant about suspicious requests for information can also help safeguard against potential misuse of your data.

This information is based on public filings made with regulatory bodies, documenting the reported data security incident at Marin Cancer Care.

Questions about this case file

Where does the Marin Cancer Care case file come from?: Every entry is taken from the breach report Marin Cancer Care 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

Named in the Marin Cancer Care breach?

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Timeline

Case facts

Case notes

Questions about this case file

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