Diagnostic Trial in Patients Who Are Undergoing Surgery for Early Stage Mouth Cancer

1. Patient must be > 18 years of age.
2. Patient must have an ECOG/Zubrod performance status of \< 2.
3. Patient must have a histologically confirmed primary T1 or T2 invasive OCSCCA that is > 6mm and \< 4 cm in size. The primary tumor must be amenable to curative resection and must be diagnosed within 42 days prior to surgery.

4. Patient must be clinically stage N0 confirmed with a negative imaging study employing contrastenhanced CT scan (or MRI with gadolinium in patients with iodine allergy). Lymph nodes will be considered positive if:

   • Greater than 1.5 cm in size for levels I and II.
   • Greater than 1 cm in size for levels III, IV, V and VI.
   • If any lymph node exhibits central necrosis, irregular enhancement of a poorly defined or irregular capsular border.
   • Groups of three or more asymmetrically located LNs, with a minimal axial diameter of 8 mm or more, in the suspected tumor drainage area are present.
   • NOTE: All CT scans must be read by a neuroradiologist.
5. Patient must be medically fit for neck dissection.
6. Patient or the patient's legally acceptable representative must provide a signed and dated written informed consent prior to registration or any study-related procedures.
7. Female patient of childbearing potential must have negative serum pregnancy test within 30 daysprior to registration.

8. If the patient is a survivor of a prior cancer, ALL of the following criteria are met:

   1. Patient has undergone potentially curative therapy for all prior malignancies,
   2. No evidence of any prior malignancies for at least 5 years with no evidence of recurrence (except for effectively treated basal cell or squamous carcinoma of the skin, carcinoma in-situ of the cervix that has been effectively treated by surgery alone, or lobular carcinoma in-situ of the ipsilateral or contralateral breast treated by surgery alone),
   3. Patient is deemed by their treating physician to be at low risk for recurrence from prior malignancies.

Exclusion Criteria:

1. Patient received prior treatment to the cervical lymph nodes, including surgery or radiation therapy.
2. Patient experienced prior extensive trauma to the anterior cervical region of the neck.
3. Patient has lesions that cross the vermilion border involving lip skin.
4. Patient has had previous tumor resection involving the neck.
5. Patient has had injections of radioactive material for previous scans within 48 hours of the radiolymphoscintigraphy.