This book, part contributed volume, part proceedings, discusses state-of-the-art advances on human cell transformation in cell models for the study of cancer and aging. Several of the chapters are from the Human Cell Transformation: Advances in Cell Models for the Study of Cancer and Aging conference that was held in June 2018 at McGill University. The authors represent international expertise on a wide variety of topics ranging from different types of cancer (prostate, bone, breast, etc.) to tumor microenvironment, tumor progression, homogeneity, and possible therapies and treatments.