Safety, Preliminary Efficacy and PK of Isatuximab (SAR650984) Alone or in Combination With Atezolizumab in Patients With Advanced Malignancies

Inclusion Criteria

• Participants must have a known diagnosis of either unresectable HCC, platinum-refractory recurrent/metastatic SCCHN, platinum-resistant/refractory EOC with evidence of measurable disease or recurrent GBM.
• Greater than or equal to (>=)18 years of age.
• For participants with HCC: Documentation of progressive disease (PD) during or after treatment with either sorafenib or lenvatinib, or intolerance to the therapy.
• For participants with SCCHN: Received and failed up to 2 lines of prior systemic anti-cancer therapy with documentation of tumor recurrence or PD within 6 months of last platinum-based therapy in primary, recurrent, or metastatic setting.
• For participants with EOC: Received up to 3 lines of prior platinum-containing therapy when the disease was platinum-sensitive, and the participants should not have received any systemic therapy for platinum-resistant/refractory disease. Specific to France only: Documentation of PD on or after 1 line of anti-cancer therapy for platinum resistant/refractory disease (unless participants are ineligible or intolerant to standard of care for platinum-resistant/refractory disease).
• For participants with GBM: Documentation of PD or first recurrence during or after temozolomide maintenance therapy for newly diagnosed GBM treated with 1st line radiotherapy plus concurrent temozolomide.

Exclusion Criteria

• Prior exposure to agent that blocks CD38 or participation in clinical studies with isatuximab.
• For participants with HCC, SCCHN, EOC or GBM prior exposure to any agent (approved or investigational) that blocks the PD-1/PD-L1 pathway.
• Evidence of other immune related disease /conditions.
• History of non-infectious pneumonitis requiring steroids or current pneumonitis; history of the thoracic radiation.
• Received a live-virus vaccination within 28 days of planned treatment start. Seasonal flu vaccines that do not contain live virus are permitted.
• Prior solid organ or bone marrow transplantation.
• Eastern Cooperative Oncology Group performance status >=2 for participants with HCC, SCCHN or EOC or Karnofsky performance score less than or equal to (<=) 70 for participants with GBM.
• Poor bone marrow reserve.
• Poor organ function. The above information was not intended to contain all considerations relevant to a participant's potential participation in a clinical trial.