STAT5B and neoplasm: As for HTR2B, expression of STAT1, STAT2, STAT5A, STAT5B, and STAT6 genes, which were moderately to highly expressed in the primary tumor 142, was rapidly lost with cell passaging in the derivative T142 UM cell line (Figure 1B; similar results were also obtained with the 143 primary tumor and its derivative cell line T143 (data not shown)).