NCCS Email Error Exposes Identities of Hereditary Cancer Event Recipients

National Cancer Centre Singapore (NCCS) allegedly exposed the email addresses, identities, and in some cases workplaces of people connected to hereditary breast and ovarian cancer syndrome (HBOC) after sending a “Living with HBOC” event invitation with recipients in the CC field rather than BCC. A recipient estimated that more than 500 addresses were visible to everyone who received the message.

The disclosure could reveal recipients’ sensitive health status or genetic cancer risk, and potentially expose information about relatives and offspring because HBOC is hereditary. NCCS had not publicly confirmed the incident, disclosed the number of affected individuals, or detailed remediation actions at the time of reporting.