City of Hope Data Breach Investigation

Turke & Strauss LLP, a leading data breach law firm, is investigating City of Hope regarding its recent data breach. The City of Hope data breach involved personal identifiable information and protected health information belonging to over 800,000 individuals.


City of Hope is a comprehensive cancer center based in California. Founded in 1913, City of Hope brings a uniquely integrated model to patients spanning cancer care, research and development, academics and training, and innovation initiatives.2 Today, City of Hope’s growing national system includes its Los Angeles campus, a network of clinical care locations across Southern California, a new cancer center in Orange County, California, and treatment facilities in Atlanta, Chicago and Phoenix.2 Headquartered in Duarte, California, City of Hope employs over 10,000 individuals.


Recently, City of Hope discovered that it had experienced a data breach in which personal identifiable information and protected health information in its systems may have been accessed and acquired. Through its investigation, City of Hope determined that an unauthorized party may have accessed this sensitive information between September 19, 2023, and October 12, 2023. On April 2, 2024, City of Hope began notifying individuals whose information may have been impacted. The type of information potentially exposed includes:

  • Name
  • Social Security number
  • Date of birth
  • Driver’s license or other governmental identification
  • Financial details (e.g., bank account number and/or credit card details)
  • Health insurance information
  • Medical record number
  • Medical information

If you received a breach notification letter from City of Hope:

We would like to speak with you about your rights and potential legal remedies in response to this data breach. Please fill out the form, below, or contact us at (608) 237-1775 or

If you were impacted by the City of Hope data breach, you may consider taking the following steps to protect your personal information.

  1. Carefully review the breach notice and retain a copy;
  2. Enroll in any free credit monitoring services provided by City of Hope;
  3. Change passwords and security questions for online accounts;
  4. Regularly review account statements for signs of fraud or unauthorized activity;
  5. Monitor credit reports for signs of identity theft; and
  6. Contact a credit bureau(s) to request a temporary fraud alert.

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