A prospective trial on initiation factor 4E (eIF4E) overexpression and cancer recurrence in node-positive breast cancer.
OBJECTIVE
A previous study of patients with stage I to III breast cancer showed that those patients whose tumors were in the highest tertile of eIF4E overexpression experienced a higher risk for recurrence. This study was designed to determine whether high eIF4E overexpression predicts cancer recurrence independent of nodal status by specifically targeting patients with node-positive disease.


METHODS
The prospective trial was designed to accrue 168 patients with node-positive breast cancer to detect a 2.5-fold increase in risk for recurrence. eIF4E level was quantified by Western blots as x-fold elevated compared with breast tissues from noncancer patients. End points measured were disease recurrence and cancer-related death. Statistical analyses performed include survival analysis by the Kaplan-Meier method, log-rank test, and Cox proportional hazard model.


RESULTS
One hundred seventy-four patients with node-positive breast cancer were accrued. All patients fulfilled study inclusion and exclusion criteria, treatment protocol, and surveillance requirements, with a compliance rate >95%. The mean eIF4E elevation was 11.0 +/- 7.0-fold (range, 1.4-34.3-fold). Based on previously published data, tertile distribution was as follow: 1) lowest tertile (<7.5-fold) = 67 patients, 2) intermediate tertile (7.5-14-fold) = 54 patients, and 3) highest tertile (>14-fold) = 53 patients. At a median follow up of 32 months, patients with the highest tertile had a statistically significant higher cancer recurrence rate (log-rank test, P = 0.002) and cancer-related death rate (P = 0.036) than the lowest group. Relative risk calculations demonstrated that high eIF4E patients had a 2.4-fold increase in relative risk increase for cancer recurrence (95% confidence interval, 1.2-4.1; P = 0.01).


CONCLUSIONS
In this prospective study designed to specifically address risk for recurrence in patients with node-positive breast cancer, the patients whose tumors were in the highest tertile of eIF4E overexpression had a 2.4-fold increase in relative risk for cancer recurrence. Therefore, eIF4E overexpression appears to be an independent predictor of a worse outcome in patients with breast cancer independent of nodal status.
McClusky
Derek R
DR
Department of Surgery, Louisiana State University Health Sciences Center in Shreveport, Shreveport, Louisiana 71130, USA.
Chu
Quyen
Q
Yu
Herbert
H
Debenedetti
Arrigo
A
Johnson
Lester W
LW
Meschonat
Carol
C
Turnage
Richard
R
McDonald
John C
JC
Abreo
Fleurette
F
Li
Benjamin D L
BD
D014408:Biomarkers, Tumor / Q000096:biosynthesis*; D015153:Blotting, Western; D001943:Breast Neoplasms / Q000378:metabolism* / Q000473:pathology / Q000601:surgery; D004591:Electrophoresis, Polyacrylamide Gel; D039561:Eukaryotic Initiation Factor-4E / Q000096:biosynthesis*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D015994:Incidence; D008198:Lymph Nodes / Q000378:metabolism / Q000473:pathology; D008207:Lymphatic Metastasis; D015410:Mastectomy, Extended Radical; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local / Q000453:epidemiology / Q000378:metabolism / Q000473:pathology; D009367:Neoplasm Staging; D011446:Prospective Studies; D012307:Risk Factors; D015996:Survival Rate
D014408:Biomarkers, Tumor; D039561:Eukaryotic Initiation Factor-4E