Pretransplantation α-Fetoprotein Slope and Milan Criteria

Abstract

Hepatocellular carcinoma (HCC) is a major cause of orthotropic liver transplantations (OLT). However, tumor recurrence remains a concern. Our group has shown that a rising natural α-fetoprotein (AFP) slope (NAS) correlates with tumor characteristics. We want to assess if a rising NAS predicts tumor recurrence. We reviewed first OLT for HCC (n=144) at our center from 1992 to 2010. Patients with less than two AFP values before treatment were excluded (n=52). A rising NAS (>0.1 μg/L/day) was found in 28 patients whereas 64 presented a stable or dropping NAS. Demographics, pre-OLT therapy, and tumor characteristics were collected. Statistical analysis was performed using ANOVA, chi-square or Fisher's test, and logistic regression for recurrence after OLT. Demographics were similar among the recurrence (n=12) and nonrecurrence (n=80) groups. Patients who recurred received more treatment (P=0.017), had a higher number of lesions (P=0.025), a greater total tumor size (P=0.001), and a higher incidence of microvascular invasion (P=0.013). More patients exceeded the Milan criteria (75.0% vs. 31.3%, odds ratio [OR] 6.60, 95% confidence interval [CI] 1.45-4.05, P=0.008) and had a rising NAS (58.3% vs. 26.3%, OR 3.20, 95% CI 1.11-9.22, P=0.024) among the recurrence group. NAS was also a strong predictor of microvascular invasion (P=0.040). After correcting for age and sex, both a rising NAS (OR 3.98, 95% CI 1.01-15.81, P=0.039) and nonadherence to Milan criteria (OR 5.69, 95% CI 1.14-28.38, P=0.034) were strong predictors of recurrence after OLT. The NAS is a predictor of microvascular invasion, a finding exclusive to pathology and in itself a predictor of HCC recurrence after OLT. The NAS and Milan criteria are good predictors of recurrence. These results encourage a frequent monitoring of AFP variations before OLT.