MIB-1 labeling index as a prognostic indicator for survival in patients with FIGO stage IB squamous cell carcinoma of the cervix.

OBJECTIVE

The goal of this study was to assess whether the MIB-1 labeling index (LI) and conventional parameters could distinguish between a good and a poor prognosis in patients with squamous cell cervical carcinoma of the same FIGO stage.

METHODS

The study included 97 cases of stage IB squamous cell cervical carcinoma which were treated with radical hysterectomy between 1989 and 1991. The relation of the MIB-1 LI, conventional clinicopathologic parameters, and survival was evaluated.

RESULTS

The MIB-1 LI of the entire group of tumors was 57.1 +/- 15.9 (mean +/- SD). The MIB-1 LI was significantly different only in living and dead patients, while it was not related to conventional clinicopathologic prognostic parameters. The 5- and 10-year survival rates of patients with an MIB-1 LI </=55 were 90.0 and 88.6%, respectively, which were significantly better than the survival rates of patients with LI >55, which were 73.1 and 66%, respectively. Multivariate analyses showed that MIB-1 LI >55, lymph node metastasis, and tumor size >/=40 mm were powerful predictors of shorter survival.

CONCLUSIONS

Lymph node metastasis, tumor size, and MIB-1 LI were significant prognostic markers in patients with stage IB squamous cell cervical carcinoma.