['Therapeutic or prophylactic use of platelet concentrates (PC) is essential for patients with thrombocytopenia due to intensive chemotherapy for various malignancies. PC quality has been improved after introduction of storage containers that are more oxygen permeable than the second-generation PC containers. Consequently, shelf life of PCs at our blood bank has been extended to 6.5 days after monitoring each PC for bacterial contamination. In this prospective observational study, we compared apheresis PCs harvested by Amicus cell separator with buffy-coat (BC) PCs during storage for up to 6.5 days.', 'All PCs were collected from healthy volunteer donors and were prepared for routine clinical use. A total of 446 transfusion episodes with 688 PCs for 77 adult patients with oncological and haematological diseases were registered during a 13-month period. Outcome measures were corrected count increment after 1 h (CCI-1), after 18-24 h (CCI-2), and transfusion intervals. Transfusions were carried out after storage from 1.5 to 6.5 days.', 'Both CCI and the transfusion intervals decreased statistically significantly by increasing storage time after transfusions with apheresis PCs or BC PCs. However, less than 4% of the variation in CCI and transfusion interval could be explained by platelet storage time. There were no significant differences between BC PCs and apheresis PCs, regarding CCI and transfusion intervals.'] Does clinical effect of buffy-coat vs. apheresis platelet concentrate in patients with severe thrombocytopenia after intensive chemotherapy?