You are being asked to take part in this research study (also known as a clinical trial) because you have cancer and you have been in an atezolizumab study (hereafter referred to as the parent study) sponsored by Genentech Inc. (hereafter referred to as Genentech) or F. Hoffmann-La Roche Ltd (hereafter referred to as Roche). In the parent study, you may have benefitted from the study treatment at the time of discontinuation from the parent study.