Hereditary Coagulation Factor XI Deficiency: A Rare or Neglected Disease? Results From a Retrospective, Single-Centre Cohort in Northern Italy

Authors: Canovi, S; Leone, MC; Depietri, L; Veropalumbo, MR; Pilia, A; Granito, M; Bonanno, A; Casali, A; Colla, R; Ghirarduzzi, A.

Affiliations: Azienda USL IRCCS Reggio Emilia, Lab Anal Chim Clin Aziendale, Reggio Emilia, Italy.

Publication: Blood coagulation & fibrinolysis. 2024. 35. 32–36

ABSTRACT: To examine real-life clinical data regarding hereditary factor XI (FXI) deficiency from a secondary care center. Retrospective review of clinical records for every FXI:C 0.7 IU/ml or less reported from 2012 to 2020. Seventy-nine patients were included. Six (7.6%) had a severe deficiency (FXI:C <0.2 IU/ml). Only 55 (69.6%) patients were referred to the Haemostasis Centre. Among them, six (15%) were subsequently not identified at increased haemorrhagic risk before a surgical/obstetrical procedure. Thirty-three (41.8%) experienced at least one bleeding event, minor (25 patients) and/or major (16 patients). Minor bleedings were predominantly spontaneous and more frequent in women, major events were mainly provoked. No correlation was found between FXI:C and risk of bleeding (P = 0.9153). Lower FXI:C, but not a positive bleeding history, was related with higher likelihood of being referred to the Haemostasis Centre (P = 0.0333). Hereditary FXI deficiency prevalence is likely underestimated, real-life clinical practices outside reference centres could be suboptimal.