Have you received a letter from 21^st Century Oncology warning that your personal information was exposed? 21^st Century Oncology is a medical company. Many of the doctors who work with it practice under their own names or the names of medical groups. Some treat patients who are not cancer patients.

The company recently announced that a cyber intruder broke into a company database containing information about more than 2.2 million past and present patients, including patients’ names, Social Security numbers, physicians’ names, diagnoses, and treatment and insurance information.

The company recently sent patients letters about the breach that included an offer of one year of free credit protection services. Here are some things to know if you got a letter.

The FTC received more than 3 million complaints in 2015. That’s up from 2.5 million in 2014. Some of the increase can be attributed to the fact that more people know to complain to the FTC about bad business practices, frauds and scams. Technology helped, too — more complaints are reaching the FTC through the convenience of mobile apps. The top three complaint categories are still debt collection, identity theft, and imposter scams. The FTC took aggressive action in 2015 to help address each area and will continue to make each a high priority in 2016.