CVCs may cause complications in up to 40% of patients, with type of CVC, underlying disease and patient age being the three main factors that affect the incidence of CVC-related complications. SL-HB catheters have the best performance.

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Immunological synapse assembly relies on the clustering of lipid rafts and is required for optimal T cell activation. We demonstrate that the Wiskott-Aldrich syndrome protein (WASP) is recruited to lipid rafts immediately after TCR and CD28 triggering and is required for the movements of lipid rafts. T cells from Wiskott-Aldrich syndrome (WAS) patients, lacking WASP, proliferate poorly after TCR/CD28 activation and have impaired capacities to cluster the lipid raft marker GM1 and to upregulate GM1 cell surface expression. T cell proliferation and lipid raft clustering are restored by retroviral transfer of the WASP gene. These results demonstrate that WASP plays a central role in the movements of lipid rafts and identify a potential mechanism underlying the T cell defect affecting WAS patients.

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Summary. About 30% of patients with severe aplastic anaemia (SAA) unresponsive to one course of immunosuppressive (IS) therapy with antithymocyte or antilymphocyte globulin can achieve complete or partial remission after a second IS treatment. Among various second-line treatments, rabbit ATG (r-ATG) could represent a safe and effective alternative to horse ALG (h-ALG). In a multicentre study, 30 patients with SAA (17 males and 13 females, median age 21 years, range 2±67) not responding to a ®rst course with h-ALG plus cyclosporin (CyA) and granulocyte colony stimulating factor (G-CSF), were given a second course using r-ATG (3´5 mg/kg/d for 5 d), CyA (5 mg/kg orally from day 1 to 180) and G-CSF (5 mg/kg subcutaneously from day 1 to 90). The median interval between ®rst and second treatment was 151 d (range 58±361 d). No relevant side-effects were observed, but one patient died early during treatment because of sepsis. Overall response, de®ned as transfusion independence, was achieved in 23/30 (77%) patients after a median time of 95 d (range 14±377). Nine patients (30%) achieved complete remission (neutrophils >2´0´10 9 /l, haemoglobin >11 g/dl and platelets >100´10 9 /l). The overall survival rate was 93% with a median follow-up of 914 d (range 121±2278). So far, no patient has relapsed. Female gender was signi®cantly associated with a poorer likelihood to respond (P 0´0006). These data suggest that r-ATG is a safe and effective alternative to h-ALG for SAA patients unresponsive to ®rst-line IS treatment.