Acute Promyelocytic Leukaemia. Relationship of Cytochemical Pattern with Clinical, Morphologic and Immunological Characteristics, and Outcome.

Abstract

In a series of 61 acute promyelocytic leukemia (APL) cases multiple clinical and biological characteristics were studied in order to assess their prognostic significance and to evaluate the relationship of cytochemical pattern with clinical, morphologic, and immunological characteristics and outcome. Alpha-naphthyl acetate esterase (ANAE) activi1:y was expressed in 23 out of 41 cases (56%). Sodium fluoride-sensitive naphthol AS-D acetate esterase was evident in only one out of 22 cases (5 %). ANAE reactivity was more frequently found in typical hypergranular APL (P = 0.003) and was associated with a shorter interval symptoms-diagnosis (P = 0.04). The expression of HLA-DK, CD33, CD13 and CD11b did not show any correlation with ANAE reactivity. Complete remission (CR) was achieved in 64 % of treated patients. The actuarial median remission duration was 22 ± 3 months. CR rate was significantly related to the presence of fever, age, absolute reticulocyte count, and albumin level, while the remission duration was associated with absolute reticulocyte, leucocyte and granulocyte counts, and albumin level. In our study ANAE activity did not reflect any important clinical and biological features of APL, apart from its obvious correlation with morphological subtype. In addition ANAE activity did not correlate with early response to therapy nor related with long-term prognosis.