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Inclusion Criteria:

* Cancer diagnosis for participants for Part 1A and Part 1B:

  1. Metastatic and/or unresectable HCC diagnosed by histology and/or cytology, or diagnosed clinically by the American Association for the Study of Liver Diseases (AASLD) criteria for participants with liver cirrhosis (participants without liver cirrhosis must be diagnosed histologically) OR Other histology/cytology proven advanced and/or metastatic non-HCC solid tumors
  2. Not amenable to available standard of care: participants must have experienced disease progression on/after standard of care, or no acceptable standard curative or palliative treatments exist (or are no longer effective), according to Investigator judgement, or the participant declines standard of care therapy.
* Cancer diagnosis for participants for Part 2A:

  1. Metastatic NSCLC with no actionable driver gene mutants (such as epidermal growth factor receptor (EGFR), anaplastic lymphoma kinase (ALK)), diagnosed by histology and/or cytology not amenable to available standard of care and must have progressed on/after therapy that included an anti-PD(L)-1 agent with or without platinum-based chemotherapy.
  2. Progressive disease should be observed during the course of anti-PD(L)-1 therapy or within 12 weeks from the last dose of anti-PD(L)-1 therapy
* Additional for Part 2A: At least 1 measurable lesion per RECIST 1.1 criteria
* For all participants:

  1. Positive GPC3 expression on tumor tissue as determined locally or centrally
  2. Capable of giving signed informed consent

Exclusion Criteria:

* Eastern Cooperative Oncology Group (ECOG) performance status of ≥2.
* Predicted life expectancy ≤3 months.
* For participants with HCC: Child Pugh Class B or C liver score within 14 days of initiation of IMP. Participants with Child Pugh Class B-7 score are allowed for Part 1A.
* Known active brain metastases or leptomeningeal metastases.
* History of allogenic or solid organ transplant
* Treatment-related immune-mediated (or immune-related) AEs from immune-modulatory agents (including but not limited to anti-PD1/PD-L1 agents and anti-cytotoxic T lymphocyte associated protein 4 monoclonal antibodies) that caused permanent discontinuation of the agent, or that were Grade 4 in severity
* Significant cardiovascular disease within 3 months prior to initiation of IMP, uncontrolled arrhythmia requiring medication, or unstable angina.
* Ongoing AEs caused by any prior anti-cancer therapy \>Grade 2
* Known uncontrolled human immunodeficiency virus (HIV), hepatitis B infection, or known untreated current hepatitis C infection
* Known second malignancy either progressing or requiring active treatment within the last year.
* For combination therapy: Ongoing or recent (within 5 years) evidence of significant autoimmune disease that required treatment with systemic immunosuppressive treatments, which may suggest risk for immune-related adverse events
* Receipt of a live-virus vaccination within 28 days of planned treatment start.
* For Part 2A, has received prior GPC3 targeted anticancer treatment.
* Current pneumonitis or interstitial lung disease, or history of interstitial lung disease or pneumonitis that required oral or IV glucocorticoids to assist with management.

NOTE: Other Inclusion/Exclusion criteria may apply. The above information is not intended to contain all considerations relevant to a participant's potential participation in a clinical trial.

• Los Angeles, California, United States
• New York, New York, United States
• Providence, Rhode Island, United States
• Houston, Texas, United States
• Toronto, Ontario, Canada
• Québec, Quebec, Canada
• Shanghai, China
• Wuhan, China
• Singapore, Singapore
• Singapore, Singapore
• Singapore, Singapore
• Seoul, Seoul-teukbyeolsi, South Korea
• Seoul, Seoul-teukbyeolsi, South Korea