Every public data breach

44 disclosed this week · 26,355 on record

Cancer Treatment Centers of America at Western Regional Medical Center

Disclosed Nov 26, 201841,948 affectedConfirmed

Official notice

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 affected41,948 (as reported to HHS)
DisclosedNov 26, 2018
HappenedMay 2, 2018
AttackHacking
Data exposedNamesHealth
SectorHealthcare · US
StatusConfirmed

Sources

Notices filed

History of this record
attack2026-09-25
unknown to hackingby backfillSource
data_types2026-09-25
[] to ["names","health"]by backfillSource
records_basis2026-09-25
empty to hhsby backfillSource
records2026-09-25
empty to 41948by backfillSource
disclosed2026-09-25
2018-11-27 to 2018-11-26by backfillSource
summary2026-09-25
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, Sociby backfillSource
Added2026-09-25
First recordedby backfillSource

First seen 2026-09-25 (California AG), confirmed by California AG. Record counts are as reported. Not legal advice.

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