borderline significantP = .062
15 , 17 , 45 By this method, R304Q displays a borderline significant reduced interaction compared with wild-type AIP ( P = .062). 45 In a different study, the expression of phosphodiesterase 4A4 (PDE4A4) and phosphodiesterase 4A8 (PDE4A8) were analysed in human somatotrophinomas with confocal microscopy and immunofluorescence. 32 AIP mut-positive PitNETs were associated with low levels of PDE4A4 and PDE4A8 expression.