To qualify for FMLA, an employee must work for a covered employer, have worked for the employer for at least 12 months, and have at least 1,250 hours of service during the 12 months prior to the leave. Additionally, the employee must work at a location where the company employs 50 or more employees within 75 miles. These criteria ensure that individuals diagnosed with cancer or their caregivers can benefit from FMLA.