The design, development and documentation of software. See software engineer, systems analysis & design, programming, object-oriented programming, software metrics, CASE and Systemantics.
Overview. Posttransplant lymphoproliferative disease (PTLD) is an unusual entity that has many features of an immune system malignancy. It is characterized by uncontrolled proliferation of lymphoid lineage cells (typically B cells, rarely non-B lineage) in a context of posttransplant immunosuppression.
PTLD can also occur after allogeneic stem cell transplant, especially if people received stem cells with many of the T-cells removed (T-cell depleted). PTLD is almost always related to a virus that has been linked to lymphoma, the Epstein-Barr virus (EBV).