GATA1 and Thrombocytopenia: On the other hand, patients with pericentric inv(3) more frequently showed increased monocytes in PB and BM, thrombocytopenia and decreased megakaryocytes compared to patients with classic inv(3)/t(3;3), which could largely be due to the difference in the partner genes on 3p other than GATA1 on 3q21.