This Study in Patients With Different Types of Cancer (Solid Tumours) Aims to Find a Safe Dose of Xentuzumab in Combination With Abemaciclib With or Without Hormonal Therapies. The Study Also Tests How Effective These Medicines Are in Patients With Lung and Breast Cancer

This is a study in adult patients with different types of cancer. The purpose of this study is to find a safe dose of: * Xentuzumab in combination with abemaciclib * Xentuzumab in combination with abemaciclib and hormonal therapies The study also tests whether these medicines make tumours shrink in participants with lung and breast cancer. Participants can stay in the study as long as they benefit from and can tolerate treatment. All participants get xentuzumab infusions and abemaciclib tablets. Participants who have breast cancer get different types of hormonal therapies in addition to xentuzumab and abemaciclib. For all participants, the size of the tumour is measured regularly. Doctors also regularly check the general health of the participants."