RUMFORD — Patricia Perry, RN, OCN, and Tamara Breton, RN, OCN, have both achieved certification in adult oncology nursing.

The Oncology Nursing Certification Corp., a member of the American Board of Nursing Specialties, administers a written examination that nurses are eligible to sit for after two years of experience in oncology nursing. With successful completion of the exam, nurses are certified and are granted permission to use the OCN credential. Certification must be renewed every three years.

Both Perry and Breton acknowledge that the oncology nursing exam was more difficult than the nursing boards, which every nurse must pass to become a registered nurse.

Perry, of Rumford, has been a nurse at Rumford Hospital since 1967 and has devoted herself to the Lariviere Oncology Suite since 2006. She has also worked on the medical surgical unit.

Breton, a Rumford Hospital nurse for five years, has worked in the Oncology Suite since 2007. She lives in Roxbury.