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Researchers are conducting an observational study to assess patient satisfaction, effectiveness, and safety of subcutaneous Atezolizumab treatment in people with certain types of lung cancer and hepatocellular carcinoma. The study focuses on participants treated for approved indications in routine clinical practice across multiple countries and centers. It collects primary data on patient-reported outcomes and clinical effectiveness in real-world settings. Participants receive Atezolizumab as prescribed by their doctors for conditions including early-stage non-small cell lung cancer NSCLC after surgery and chemotherapy, metastatic NSCLC, extensive-stage small cell lung cancer ES-SCLC, and advanced or unresectable hepatocellular carcinoma HCC. Atezolizumab administration is at the physicians discretion and is independent of study participation. The study includes several cohorts based on cancer type and stage. During the study, participants report treatment satisfaction using the Therapy Administration Satisfaction Questionnaire Subcutaneous TASQ-SC at cycles 2 and 3, each lasting 3 weeks. Researchers also evaluate overall survival up to about 3.5 years, quality of life with the EORTC QLQ-C30 questionnaire, and record adverse events during the same period. The study aims to monitor patient experience, clinical outcomes, and safety over the long term, with participation lasting several years.