Intrathecal Double Checkpoint Inhibition

Patients shall be treated with a fixed dose of intrathecal nivolumab and increasing doses of intrathecal ipilimumab. From cycle 2, patients will receive systemic nivolumab/ipilimumab in addition to intrathecal treatment. Systemic nivolumab/ipilimumab corresponds to the current standard of care for non-small cell lung cancer and for melanoma patients.