Analysis of surgical margins with the molecular marker eIF4E: a prognostic factor in patients with head and neck cancer.
OBJECTIVE
Complete excision of cancer is guided by histologic assessment of surgical margins. Molecular markers may be more sensitive in identifying malignant cells. eIF4E, a eukaryotic protein synthesis initiation factor, is found elevated in all head and neck squamous cell cancers (HNSCC). In a preliminary study using Western blots and a retrospective study using immunohistochemistry, eIF4E elevation in histologically tumor-free surgical margins correlated with a higher local-regional recurrence. We wanted to confirm this hypothesis in a prospective study.


METHODS
Immunohistochemical analysis of surgical margins and tumors with an antibody to eIF4E was performed on all newly diagnosed HNSCC patients who underwent surgical resection for their disease between January 1996 and December 1997.


RESULTS
All 65 patients had elevated levels of eIF4E in the tumors. Thirty-six patients (55%) had elevated eIF4E in histologically tumor-free margins, and 20 of these patients (56%) have had local-regional recu rrences. Twenty-nine patients (45%) had no elevation of eIF4E in the margins, and only two of these patients (6.9%) have had recurrences. Cox regression analysis showed that elevated eIF4E in the margins was an independent prognostic factor (P =.009) for recurrence. The Kaplan-Meier curves for the probability of nonrecurrence were significantly different for positive and negative eIF4E margins (P =. 0001, log-rank test).


CONCLUSIONS
In histologically tumor-free surgical margins, elevated levels of eIF4E predict a significantly increased risk of recurrence. Elevated levels of eIF4E in tumor margins may identify patients who could benefit from additional therapy.
Nathan
C O
CO
Departments of Otolaryngology/Head and Neck Surgery, Pathology, Biochemistry/Molecular Biology, and the Feist-Weiller Cancer Center, Louisiana State University Medical Center, Shreveport, LA 71130, USA. cnatha@lsumc.edu
Franklin
S
S
Abreo
F W
FW
Nassar
R
R
De Benedetti
A
A
Glass
J
J
D000704:Analysis of Variance; D014408:Biomarkers, Tumor / Q000032:analysis*; D002294:Carcinoma, Squamous Cell / Q000737:chemistry* / Q000473:pathology / Q000601:surgery; D039561:Eukaryotic Initiation Factor-4E; D005260:Female; D006258:Head and Neck Neoplasms / Q000737:chemistry* / Q000473:pathology / Q000601:surgery; D006801:Humans; D008297:Male; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local; D009367:Neoplasm Staging; D018365:Neoplasm, Residual; D010448:Peptide Initiation Factors / Q000032:analysis*; D011379:Prognosis; D011446:Prospective Studies; D012044:Regression Analysis; D016896:Treatment Outcome
D014408:Biomarkers, Tumor; D039561:Eukaryotic Initiation Factor-4E; D010448:Peptide Initiation Factors