...If a patient declines to participate in any voluntary exploratory research and/or genetic component of the study, there will be no penalty or loss of benefit to the patient and he/she will not be excluded from other aspect of the study.Part A of the study (Phase I):Dose escalationPatients must have documented histologically or cytologically confirmed locally advanced or metastatic NSCLC with EGFR or HER2 mutations, and have relapsed from, been refractory to or are intolerant to prior standard therapy without preferred alternative therapy.Dose expansionDose expansion cohort 1 and cohort 2: NSCLC patients with EGFR Exon20ins or HER2 Exon20ins, who have relapsed from, been refractory to or are intolerant to at least one line of prior systemic therapy.Dose expansion cohort 3 and cohort 4: NSCLC patients with EGFR Exon20ins, who have relapsed from, been refractory to or are intolerant to at least one line of prior systemic therapy.Dose expansion cohort 5: NSCLC patients with EGFR Exon20ins, who have not received prior systemic therapy (treatment naïve).Dose expansion cohort 6: NSCLC patients with EGFR Exon20ins, who have recevied at least one line of prior systemic therapy, and must have relapsed from, been refractory to or intolerant to Amivantamab treatment.Part B of the study (Phase II):Patients must have histologically or cytologically confirmed locally advanced or metastatic NSCLC with EGFR Exon20ins which is confirmed by central laboratory using an analytically validated next generation sequencing-based assay in archived tumor samples (if a patient has more than one FFPE blocks, the most recent tissue is preferred) or any fresh tumor biopsies (if archived tumor sample is not available) prior to the study entry. ...