Percentage of patients with a diagnosis of oral cavity cancer seen in the practice setting who have a TNM cancer stage documented in the medical record within one month of the first office visit AND who receive treatment if identified with a primary tumor depth > 4 mm Rate 1: Patients aged 18 and older diagnosed with early oral cavity cancer. Rate 2: Patients 18 years or older diagnosed with clinical node negative (clinical state T1N0M0 or T2N0M0) oral cavity cancer with the depth of the primary tumor > 4mm documented in the medical record within one month of the first office visit