If you run software from Elekta you might have been hacked back in April. And there was no public announcement. You a Cancer patient? did you have "radiation" therapy? You could have been effected (and never notified).
Elekta still refuses to say who was effected or how they were hacked. Read their announcement.
"Affected customers have been notified and fully briefed through the appropriate channels and in accordance with legal requirements and business agreements with Elekta."
why did you not get notified? Because of a BBA. it is the Healthcare industries "get out of jail card"
If your not familiar with BBA's (the get our of jail card for HIPAA) you can read more at Health IT Security
Read more at Woods LLP