- No prior chemotherapy or therapy with systemic anti-tumor therapy (e.g., monoclonal antibody therapy) or prior exposure to agents directed at the HER axis (e.g. epidermal growth factor receptor tyrosine kinase inhibitors (EGFR TKI), Herceptin). Prior surgery and/or localized palliative irradiation is permitted provided that the irradiated lesion is not the only measurable lesion. Prior adjuvant chemotherapy > 1 year ago and prior treatment with an EGFR-TKI for patients with an activating EGFR mutation is allowed.