Study of the Safety and Efficacy of LHC165 Single Agent and in Combination With PDR001 in Patients With Advanced Malignancies

Inclusion Criteria: * Written informed consent must be obtained prior to any procedures unless considered standard of care. * Adult men and women (≥ 18 years of age) with histologically confirmed diagnosis of metastatic and/or advanced solid tumors not amenable to curative treatment by surgery. * Patients must be willing and able to comply with the protocol for the duration of the study including undergoing treatment and scheduled visits and examinations including follow up. * Dose escalation: Patients with accessible tumors and with measurable disease as determined by RECIST 1.1 and have progressed despite standard treatment or are intolerant of standard treatment, or for whom no standard treatment exists. * Dose expansion: Patients with advanced/metastatic solid tumors: HNSCC, melanoma, accessible tumors and visceral tumors (LHC165 combination with PDR001 only). Patients must have measurable disease as determined by RECIST 1.1 and have progressed despite standard treatment or are intolerant to standard treatment, or for whom no standard treatment exists• Patients must have at least two sites of disease amenable to biopsy. * Patient has an Eastern Cooperative Oncology Group (ECOG) performance status 0-2. Exclusion Criteria: * Presence of symptomatic or uncontrolled central nervous system (CNS) metastases requiring local CNS-directed treatment. * Patients diagnosed with hematological malignancies. * Patients with prior stem cell transplants. * Patients previously treated with TLR-7/8 agonist treatment. * History of primary immunodeficiency * Patients who discontinued prior anti-PD-1/PD-L1 therapy due to an anti-PD-1/PD-L1-related toxicity. * Malignant disease, other than that being treated in this study