The first-line treatment with single agent AZD3759 results in superior Progression Free Survival (PFS) compared to Standard of Care (SoC) Epidermal Growth Factor Receptor Tyrosine Kinase Inhibitors (EGFR-TKI), in patients with advanced EGFR mutation positive non-small cell lung cancer (NSCLC) with Central Nervous System (CNS) metastasis

This is a Phase II/III randomized, open-label, multicenter study to compare the efficacy and safety of first line single-agent AZD3759 vs. Erlotinib or Gefitinib treatment in patients with advanced EGFR mutation positive NSCLC with CNS metastases.

Eligible patients with documented EGFR mutation+ (L858R and/or Exon 19Del) TKI-naïve advanced NSCLC and documented intracranial disease will be enrolled.

Inclusion Criteria:

1. Properly completed patient informed consent
2. Male or female aged at least 18 years
3. Histologically or cytologically confirmed diagnosis of NSCLC with activating EGFR mutations including L858R and/or Exon19Del. EGFR mutation status will be determined by local or central laboratory testing on tumour tissue or plasma utilizing a validated methodology which has been approved by the regulatory authority.
4. No prior treatment with chemotherapy, EGFR-TKIs, or biological therapies that are considered first line treatment for advanced NSCLC.
5. All patients must have a documented diagnosis of advanced (Stage IV) NSCLC with Magnetic Resonance Imaging (MRI) documented CNS metastases that include brain metastases (BM). BM + patients with co- existent leptomeningeal involvement are eligible for the study.
6. Eligible patients are not candidates for definitive surgical resection or radiation of all lesions in the opinion of the treating physician.
7. All patients must be stable without any systemic (oral or parenteral) corticosteroid or anticonvulsant therapy for at least 2 weeks prior to study treatment. Inhaled non-absorbable and topical corticosteroid use are permitted as indicated.
8. Patients may have prior placement of a properly functioning CNS shunt or Ommaya reservoir.
9. Eastern Cooperative Oncology Group (ECOG) performance status 0 to 1 with no deterioration over the previous 2 weeks.
10. Women of child-bearing potential and male subjects shall agree to take medically acceptable contraception measures while on study treatment and for 3 months following completion of study treatment. All women of child-bearing potential must have a negative blood pregnancy test at screening.
11. (a) For Patients with measurable CNS lesions must have AT LEAST ONE site of CNS lesion, which was not previously irradiated, that can be accurately measured at baseline as ≥ 10 mm in the longest diameter by MRI and which is suitable for accurate repeated measurements. Measurable extracranial disease is not required. (b) For Patients with non-measurable CNS lesions must have AT LEAST ONE extracranial lesion, which has not been previously irradiated, within the screening period that can be accurately measured at baseline as ≥ 10 mm in the longest diameter (except lymph nodes which must have short axis ≥ 15 mm) by CT/MRI and are suitable for accurate repeated measurement.