An Open-Label Phase 1/2 Study of Itacitinib in Combination With Osimertinib in Subjects With Locally Advanced or Metastatic Non-Small Cell Lung Cancer

• 18 years of age or older at screening; outside the U.S. and European Union, an older limit could apply depending on local regulation (eg, 19 years and older for South Korea and 20 years and older for Taiwan).

• Histologically or cytologically confirmed unresectable locally advanced (Stage IIIB) or metastatic (Stage IV) NSCLC.

• Documented evidence of somatic activating mutation in EGFR (eg, G719X, exon 19 deletion, L858R, L861Q) in a tumor tissue sample. If a tissue sample is not available, then EGFR mutation status may be determined from circulating tumor DNA obtained from a blood sample using a validated or approved test kit.

‣ Phase 1: Subjects must have previously received and progressed on or after treatment with an EGFR tyrosine kinase inhibitor (TKI). Additional lines of systemic therapy including investigational agents for locally advanced or metastatic NSCLC are allowed.

⁃ Phase 2: Subjects must not have received more than 1 prior line of therapy for locally advanced or metastatic NSCLC. First-line treatment must include an EGFR TKI, and subjects must have documented disease progression during or following treatment. Subjects with disease that progressed more than 6 months after completion of neoadjuvant/adjuvant chemotherapy or chemoradiation therapy are eligible if they received an EGFR TKI as first-line treatment for advanced NSCLC.

∙ Subjects must have evidence of a T790M mutation in tumor tissue or plasma obtained after disease progression during or after treatment with an EGFR TKI. T790M mutation status from a local laboratory is acceptable; however, a tumor tissue sample or plasma sample suitable for centralized T790M mutation analysis must be available.

• Radiographically measurable or evaluable disease per RECIST v1.1.