In our study, features associated with TBP were pleural ADA between 70 and 150 IU/L (inversely, negative association with ADA ≥ 150), lymphocytes ≥ 35%, eosinophils < 10%, LD/ADA ratio < 18, absence of leukocytosis, and absence of thrombocytopenia. This evidence concerns the gene ADA and Thrombocytopenia.