This volume ofAdvances in Cancer Researchbegins with a review by M. Roussel of the key effectors of cytokine and growth factor signaling to the cell cycle block. P 53 and how it controls the cell cycle, genomic stability, and apoptosis are reviewed by M.R.A. Mowat. The third chapter, by T.S. Lewis and colleagues, discusses the effect of MAP kinase cascades as examples of signal transduction mechanisms in signaling pathways. In Chapter 4, Soziet al. Review the frequent abnormalities found in theFHITgene in a variety of cancer-derived cell lines. Volume 74 concludes with an overview by J.J. Hsuan and co-workers of the cellular functions of PtdlnsP2 and the regulation of its biosynthesis.