You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Post-transplant lymphoma occurs due to proliferation of which of the following cells - and explain in detail?
Post-transplant lymphoproliferative disorders (PTLD) are a diverse group of abnormal lymphoid growths that include both hyperplasias and neoplasias.
They have been divided into several general pathologic categories that have prognostic significance.
These include early or hyperplastic PTLD, polymorphic PTLD, and lymphomatous or monomorphic PTLD.
The majority of PTLDs are of B-cell origin and contain Epstein-Barr virus (EBV), however, PTLDs of T or NK cell origin have been described and late-arising EBV negative lymphoid tumors are becoming more frequently reported in this population.