Follicular lymphoma (FL) has a meshwork of follicular dendritic cells (FDCs). We previously demonstrated the presence of estrogen receptor alpha (ERα) CD23 FDCs in grades 1-2 FL. The significance of FDCs as a prognostic factor in FL remains unknown. The current study aimed to compare clinicopathological features, including prognosis, between FL with and without ERα FDCs. This study evaluated the clinicopathological significance of ERα expression in 70 FL patients by immunostaining. The presence of ERα mRNA on FDCs from 5 FL patients was confirmed by CD21/ERα double staining (immunohistochemistry and in situ hybridization). We defined patients with frequent ERα expression as the ERα group and those with infrequent ERα expression as the ERα group. Thirty-two patients were assigned to the ERα group (45.7%), and 38 patients were assigned to the ERα group (54.3%). Both overall survival (OS) and progression-free survival (PFS) were significantly better in the ERα group than in the ERα group (OS, log-rank, P = .0465; PFS, log-rank, P = .0336). Moreover, high ERα expression on FDCs was an independent prognostic factor for OS in both the univariate ([hazard ratio] HR, 0.163; P = .0260) and multivariate (HR, 0.050; P = .0188) analyses and for PFS in both the univariate (HR, 0.232; P = .0213) and multivariate (HR, 0.084; P = .0243) analyses. ERα mRNA expression was detected in CD21 FDCs within the neoplastic follicles of FL patients. In conclusion, a neoplastic follicular microenvironment with ERα-positive FDCs might affect the grade and presence of the follicular pattern of FL and improve patient prognosis.
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| http://dx.doi.org/10.1002/hon.2730 | DOI Listing |
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