No abstract

The occurrence of unexplained peripheral blood cytopenia, particularly neutropenia, has been recently reported after rituximab. Its prevalence may be underestimated since it may occur late after treatment. This study analysed all cases of unexplained delayed-onset peripheral blood cytopenia of WHO grade II - IV occurring in an unselected series of patients treated with rituximab in order to evaluate its prevalence and clinical significance. Seventy-seven courses of rituximab (corresponding to 317 rituximab infusions) given to 72 consecutive patients affected by non-Hodgkin's Lymphoma and treated at a single Center with rituximab, alone (nine cases), associated with chemotherapy (50) or with chemotherapy and autologous stem cell transplantation (18) were evaluated. Twenty-three cases of cytopenia (29.8%) were observed. Neutropenia developed in 21 cases (27.3%), thrombocytopenia in eight (10.4%), anemia in four (5.2%). Multiple cytopenias were observed in nine cases. Neutropenia developed after a median of 10 weeks, anemia of 5 weeks and thrombocytopenia of 4 weeks after the last rituximab dose. Severe infections occurred in four of 21 neutropenic patients (19%), compared to two of 56 controls (3.6%) (p = 0.043). Cytopenia eventually resolved in nine of 18 evaluable cases after a median of 10 weeks (range 1 - 23). Age, sex, histology, bone marrow infiltration, hypogammaglobulinemia, previous chemotherapy, autologous stem cell transplant, rituximab schedule and timing, rituximab doses were analysed as predictors for cytopenia; by multivariate analysis only a previous treatment with chemotherapy and more than four rituximab doses were significantly associated with a higher risk of post-rituximab delayed cytopenia. Delayed-onset cytopenia, particularly neutropenia, is a clinically significant complication of rituximab treatment, which merits further investigation.

Order of Authors: Carlo L Balduini; Luigi Gugliotta; Mario Luppi; Luca Laurenti; Catherine Klersy; Carla Pieresca; Gerlando Quintini; Francesco Iuliano; Rossana Re; Pierangelo Spedini; Nicola Vianelli; Alfonso Zaccaria; Enrico M Pogliani; Roberto Musso; Enrico Bobbio Pallavicini; Giovanni Quarta; Piero Galieni; Alberto Fragasso; Gianluca Casella; Patrizia Noris; Edoardo Ascari Abstract: Therapeutic plasma exchange (PE) is the accepted therapy for thrombotic thrombocytopenic purpura (TTP). Because not all patients obtain remission, other treatment modalities have been used in addition to PE, but no randomized clinical trial evaluated their efficacy. The aim of this multicentric study was to compare the effectiveness of standard-versus high-dose methylprednisolone as an adjunctive treatment to PE in the acute phase of TTP. Sixty patients with idiopathic TTP were randomized to receive standard-dose (1 mg/kg/die i.v.) or high-dose methylprednisolone (10 mg/kg/die for three days, thereafter 2.5 mg/kg/die) in addition to PE. Both dosages of steroids were well tolerated. At the end of induction therapy (day 23), the percentage of patients failing to obtain complete remission was significantly higher in the standard-dose (16/30) than in the high-dose group (7/30). Also the number of cases without a good response at day 9 and the number of deaths were higher in the standard-dose arm, but the differences did not reach the statistical significance. Results of present study indicate that the association of PE with high-dose instead of standard-dose steroids reduces the percentage of TTP patients that fail to achieve complete remission.Response to Reviewers: Reviewer #1: The authors have proved that the association of plasma exchanged with high-dose methylprednisolone instead of standard-dose reduces the percentage of TTP patients that failed to achieve complete remission. This observation has important clinical implication. I have no major remarksMinor remarks: Activity of ADAMTS 13 and autoantibodies against ADAMTS 13 were not tested. In my opinion this paper can be published in Annals Of Hematology in the present form.Reviewer #2: General:In this randomized clinical trial Balduini and colleagues compared low-dose vs. high dose steroids as an adjunctive treatment to plasma exchange with fresh frozen plasma / cryosupernatant in 60 patients suffering from acute TTP. In the low-dose arm more patients (13/30 vs. 7/30, p= 0.17) failed to achieve a good response at day 9 (primary endpoint of the study) and also more patients failed to achieve complete remission (16/30 vs. 7/30; p= 0.03). Also the number of death (4 vs. 1) was higher, this was however not statistically significant. The authors conclude that plasma exchange in combination with high dose steroids is superior to low-dose steroids. Over the years the Italian TTP study group has been able to conduct several randomized clinical trials in the setting of acute TTP addressing open questions in the field where many other groups have failed to do likewise due to lack of sui...

Purpose: This phase II prospective study aimed to evaluate the efficacy and safety of 5-days azacytidine (5d-AZA) in patients with low-risk myelodysplastic syndromes (MDS). Second, single-nucleotide polymorphism (SNP) genetic profile and phosphoinositide-phospholipase C (PI-PLC) b1 levels were studied to evaluate possible biologic markers able to predict the hematologic response.Experimental Design: The study tested a lower intensity schedule of azacytidine. The treatment plan consisted of 75 mg/sqm/d subcutaneous administered for 5 days every 28 days, for a total of 8 cycles.Results: Thirty-two patients were enrolled in the study. The overall response rate was 47% (15 of 32) on intention-to-treat and 58% (15 of 26) for patients completing the treatment program. In this latter group, 5 (19%) achieved complete remission (CR) and 10 (38%) had hematologic improvement, according to the International Working Group (IWG) criteria. Three patients have maintained their hematologic improvement after 37, 34, and 33 months without other treatments. Moreover, 21 and 2 of 26 cases completing 8 cycles were transfusion-dependent for red blood cells and platelets at baseline, respectively. Of these, 7 (33%) and 2 (100%) became transfusion-independent at the end of the treatment program, respectively. Grade 3-4 neutropenia occurred in 28% of patients and 4 patients died early due to infections or hemorrhage. SNP results were not significantly correlated to the clinical outcome, whereas PI-PLCb1 level anticipated either positive or negative clinical responses.Conclusions: 5d-AZA is safe and effective in a proportion of patients with low-risk MDS. PI-PLCb1 gene expression is a reliable and dynamic marker of response that can be useful to optimize azacytidine therapy.