In mid-August 2026, Novocure confirmed unauthorized access to some of its information systems. When we learned of the unauthorized access, we activated our cybersecurity response plan, implemented containment measures, and initiated an internal investigation of the event. We also engaged independent cybersecurity forensic experts to assist with the investigation, including reviewing the exposed data that was accessed.

We determined that the exposed data included: internal Company patient ID numbers for over 1,400 U.S. patient records (these ID numbers are only used internally and no patient names or other identifying data for these was exposed); patient data for fewer than 50 other patients in the western U.S. that included additional identifying information; general contact information for healthcare providers we work with; and general contact information for Novocure employees, such as their job titles and phone numbers.

No access to any of our medical treatment devices was obtained, our ability to operate has not been compromised and all of our systems are fully functional.

The security of the information we hold about our patients and the healthcare professionals we work with is of the utmost importance to us. We believe any data breach is unacceptable and continue to vigilantly monitor our systems and implement improvements to strengthen our data security as needed. 

Next Steps: Information for Patients and Physicians 

Novocure is contacting patients whose information was involved in the event.

If you are an affected patient, Novocure will notify you directly. 
 

• For most affected patients, the information involved did not include their name or other identifying information. These patients will be contacted by mail. 
• Patients whose identifiable information was involved, Novocure will be contact them by phone as well as mail.
• For patients with questions, please contact MyNovocure at 1-855-281-9301 or email at support@mynovocure.com.

If you are a physician and have questions, please contact your Novocure representative. 

For More Information

Other questions about the data breach should be directed to cyber.response@novocure.com.