Objective To study the effect of 8 Br cAMP on oncogene expression and cell growth in human cultured retinoblastoma cells. Methods The c fos,N myc and p21ras mRNAs were detected by in situ hybridization and RNA dot blot techniques.The immunoreactivity (IR) of proliferative cell nuclear antigen (PCNA),c Fos,N Myc and P 21ras were detected by immunohistochemistry and protein dot blot techniques. Results In the HXO Rb44 cells the signals for ...