Cancer Treatment Centers of America at Western Regional Medical Center
Disclosed Nov 26, 20187 years ago41,948 affectedConfirmed
The covered entity (CE), Cancer Treatment Centers of America, reported that an employee was the victim of an email phishing attack affecting 41,948 individuals. The protected health information (PHI) involved included names, addresses, Social Security numbers, diagnoses/conditions, and treatment information. CTCA notified HHS, affected individuals, and the media. In its mitigation efforts, the CE implemented additional administrative and technical safeguards and retrained its staff. OCR obtained assurances that the CE implemented the corrective actions noted.
What is known
| People affected | 41,948 (as reported to HHS) |
|---|---|
| Disclosed | Nov 26, 2018 |
| Happened | May 2, 2018 |
| Attack | Hacking |
| Data exposed | Names, Health |
| Sector | Healthcare · US |
| Status | Confirmed |
Sources
| Source | |
|---|---|
| California Attorney General breach notice: Cancer Treatment Centers of America at Western Regional Medical Centeroag.ca.gov · Official notice | Official notice |
| HHS OCR breach report (archive, resolved): Cancer Treatment Centers of America at Western Regional Medical Center (Healthcare Provider, AZ)ocrportal.hhs.gov · Official notice | Official notice |
Notices filed
| Where | Filed | People |
|---|---|---|
| HHS archivetotal | Nov 26, 2018 | 41,948 |
| California AGresidents of CA | Nov 27, 2018 |
History of this record
- 2026-09-25 · attack: unknown to hacking · backfill source
- 2026-09-25 · data_types: [] to ["names","health"] · backfill source
- 2026-09-25 · records_basis: empty to hhs · backfill source
- 2026-09-25 · records: empty to 41948 · backfill source
- 2026-09-25 · disclosed: 2018-11-27 to 2018-11-26 · backfill source
- 2026-09-25 · summary: empty to The covered entity (CE), Cancer Treatment Centers of America, reported that an employee was the victim of an email phishing attack affecting 41,948 individuals. The protected health information (PHI) involved included names, addresses, Soci · backfill source
- 2026-09-25 · added · backfill source
First seen 2026-09-25 (California AG), confirmed by California AG. Record counts are as reported. Not legal advice.
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