* Provision of signed and dated, written Master informed consent form (ICF) prior to any trial-specific procedures, sampling, or analyses.
* Patient ≥18 years of age at the time of signature of the ICF.
* Eastern Cooperative Oncology Group (ECOG) score: 0 or 1.
* Patient must agree to a pre-treatment biopsy (if archival tissue is not available) and on-treatment tumour biopsy.
* Life expectancy of at least 12 weeks after the start of the treatment according to the Investigator's judgement.
* Male or female patients. Women of childbearing potential (WOCBP) and men able to father a child must be willing and able to use highly effective methods of birth control (that result in a low failure rate of less than 1% per year when used consistently and correctly) during trial participation and for at least 6 months after the last administration of trial medication.
- Histologically confirmed diagnosis of one of the following cohorts:
* Cohort 1 GEC - Locally advanced, unresectable or metastatic gastric adenocarcinoma or gastro oesophageal adenocarcinoma (GEC) (defined as primary tumour localisation below the gastro oesophageal junction (GEJ) with prior anti-PD-1 or anti-PD-L1 based treated tumour.
* Cohort 2 Patients with secondary resistance to anti-PD-1 or anti-PD-L1 based therapy: Any advanced or metastatic solid tumour with previously anti-PD-1 or anti-PD-L1 based treatment who progressed after achieving benefit
* Cohort 3 Patients with primary resistance to anti-PD-1 or anti-PD-L1 based therapy: Select advanced or metastatic solid tumour types with previous anti-PD- 1/PD-L1 based treated tumour without achieving benefit.
* All patients must have measurable lesions according to RECIST v1.1
* Patient must agree to pre- and on-treatment tumour biopsies. If archived tumour tissue is available from the last treatment failure, sections may be supplied instead of a pre-treatment biopsy.
* Histologically confirmed diagnosis of one of the following cohorts:
* Cohort 1: GEC: Locally advanced, unresectable or metastatic gastric adenocarcinoma or GEC.
* Cohort 2: Patients with secondary resistance to anti-PD-1 or anti-PD-L1 based therapy: Any advanced or metastatic solid tumour (excluding NSCLC and melanoma) with previously anti-PD-1 or anti-PD-L1 based treatment which progressed after achieving benefit.
* Cohort 3: Patients with primary resistance to anti-PD-1 or anti-PD-L1 based therapy: Select advanced or metastatic solid tumour types with previous anti-PD-1/PD-L1 based treated tumour without achieving benefit.
* Cohort 4: Locally advanced, unresectable or metastatic second line or greater, microsatellite stable (MSS) colorectal cancer.
* Cohort 5: Advanced Endometrial cancer: Endometrial carcinoma that is pMMR (Mismatch Repair-Proficient)/MSS and is advanced, recurrent, or persistent and has relapsed or is refractory to curative therapy.
* All patients must have at least one measurable lesion according to RECIST v1.1
* Further inclusion criteria apply
* Any investigational treatment anti-tumour treatment within 4 weeks or within 5 half-life periods (whichever is shorter) prior to the initiation of trial treatment.
* More than one anti-PD-(L)1-based treatment regimen prior to entering study
* Major surgery ('major' according to the Investigator's assessment) performed within 12 weeks prior to first trial treatment or planned within 12 months after screening, e.g., hip replacement.
* Known history of severe hypersensitivity reactions to other mAbs or known hypersensitivity to the trial drugs or their excipients.
* Presence of central nervous system (CNS) metastases, unless treated and asymptomatic and off corticosteroids and/or anticonvulsant therapy for at least 2 weeks prior to start of treatment.
* Immunosuppressive corticosteroid doses (\>10 mg prednisone daily or equivalent) within 4 weeks prior to the first dose of study treatment.
* Active autoimmune disease or a documented history of autoimmune disease, except vitiligo or resolved childhood asthma/atopy. Patients who were permanently discontinued from previous anti-PD-1 or anti-PD-L1 therapy because of a immune-related adverse event (irAE).
- Previous treatment with an anti-LAG-3 Agent
* Unresolved, Grade \>1 toxicity before the start of treatment with the study drug except for hair loss (alopecia) and hypothyroidism that requires thyroid hormone supplements but is asymptomatic under therapy.
* Significant cardiovascular/cerebrovascular diseases (i.e. uncontrolled hypertension, unstable angina, history of infarction within past 6 months, congestive heart failure \> New York Heart Association \[NYHA\] II)
* History of severe haemorrhagic or thromboembolic event in the past 12 months
* Known inherited predisposition to bleeding or to thrombosis, in the opinion of the investigator - Further exclusion criteria apply
Indiana University (IU)
Indiana University Hospital / IU Simon Cancer Center