UICC stage III A or III B (without malignant pleural or pericardial effusion) non-small cell lung cancer

Whole body PDG-PET scan before the start of therapy available: no distant metastasis.

CT or preferably MRI of the brain before the start of radical therapy available; no brain metastasis.

Platinum-based chemotherapy is mandatory.

Radical local therapy: concurrent or sequential chemotherapy and radiotherapy with or without surgery.

Radiotherapy dose without surgery to at least biological equivalent of 60 Gy.

No prior cranial irradiation.sufficient proficiency in Dutch language

sufficient proficiency in Dutch language

MRI (and not CT scan) pre-PCI

Prophylactic Cranial Irradiation (PCI) Cognitive Tests in Non-small Cell Lung Cancer (NSCLC) Patients