Sentinel lymph node biopsy accurately stages the regional lymph nodes for T1-T2 oral squamous cell carcinomas: results of a prospective multi-institutional trial.
OBJECTIVE
The validity of sentinel lymph node biopsy (SLNB) for T1 or T2, clinically N0, oral cancer was tested by correlation of sentinel node pathologic status with that of nodes within the completion neck dissection.


METHODS
This prospective, cooperative group trial involved 25 institutions over a 3-year period. One hundred forty patients with invasive oral cancers, stage T1 and T2, N0 including 95 cancers of the tongue, 26 of the floor of mouth, and 19 other oral cancers were studied. The study excluded lesions with diameter smaller than 6 mm or minimal invasion. Imaging was used to exclude nonpalpable gross nodal disease. Patients underwent injection of the lesion with (99m)Tc-sulfur colloid, nuclear imaging, narrow-exposure SLNB, and completion selective neck dissection. The major end point was the negative-predictive value (NPV) of SLNB.


RESULTS
In the 106 SLNBs, which were found to be pathologically and clinically node-negative by routine hematoxylin and eosin stain, 100 patients were found to have no other pathologically positive nodes, corresponding to a NPV of 94%. With additional sectioning and immunohistochemistry, NPV was improved to 96%. In the forty patients with proven cervical metastases, the true-positive rate was 90.2% and was superior for tongue tumors relative to floor of mouth. For T1 lesions, metastases were correctly identified in 100%.


CONCLUSIONS
For T1 or T2 N0 oral squamous cell carcinoma, SLNB with step sectioning and immunohistochemistry, performed by surgeons of mixed experience levels, correctly predicted a pathologically negative neck in 96% of patients (NPV, 96%).
Civantos
Francisco J
FJ
University of Miami, Miami, FL 33136, USA. fcivanto@med.miami.edu
Zitsch
Robert P
RP
Schuller
David E
DE
Agrawal
Amit
A
Smith
Russell B
RB
Nason
Richard
R
Petruzelli
Guy
G
Gourin
Christine G
CG
Wong
Richard J
RJ
Ferris
Robert L
RL
El Naggar
Adel
A
Ridge
John A
JA
Paniello
Randal C
RC
Owzar
Kouros
K
McCall
Linda
L
Chepeha
Douglas B
DB
Yarbrough
Wendell G
WG
Myers
Jeffrey N
JN
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002294:Carcinoma, Squamous Cell / Q000473:pathology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009062:Mouth Neoplasms / Q000473:pathology*; D037981:Neck Dissection; D009367:Neoplasm Staging; D011237:Predictive Value of Tests; D011446:Prospective Studies; D015203:Reproducibility of Results; D021701:Sentinel Lymph Node Biopsy