The drug being tested in this study is called YK-029A. YK-029A is being tested to evaluate the efficacy as a first line treatment compare with platinum-based chemotherapy in the participants with locally advanced or NSCLC whose tumors harbor EGFR exon 20 insertion mutations.~The study will enroll 350 patients. Participants will be randomly assigned to one of the two treatment groups-YK-029A Group (Arm A) or Platinum-based Chemotherapy Group (Arm B).~The participants will be administered with YK-029A orally in arm A and pemetrexed/cisplatin or pemetrexed/carboplatin intravenously (IV) in arm B until the participants experience progressive disease (PD) as assessed by blinded independent review committee (IRC), intolerable toxicity or another discontinuation criteria.~Participants in the chemotherapy group should not be allowed to cross over to treatment with YK-029A after IRC-assessed PD is documented. Randomized treatment with YK-029A or platinum-based chemotherapy may be continued after PD, at the discretion of the investigator and with the sponsor's approval, if there is still evidence of clinical benefit.~This multi-center trial will be conducted in China . The overall time to participate in this study is until 3 years after the last participant is randomized. Participants will make multiple visits to the clinic and will be followed for survival, subsequent anticancer therapy, subsequent disease assessment outcome until disease progression on a subsequent anticancer therapy, and participant-reported health status (EORTC QLQ-C30 and EORTC QLQ-LC13) for 3 years after the last participant is randomized in the study and 30 days after the last dose of study drug for safety follow-up.
The purpose of this study is to compare the effectiveness of YK-029A as first-line treatment with that of platinum-based chemotherapy in participants with locally advanced or metastatic non-small cell lung cancer (NSCLC) whose tumors has epidermal growth factor receptor (EGFR) exon 20 insertion mutations.~Participants will be randomly assigned to one of the two treatment groups YK-029A group or Platinum-based chemotherapy group.~Participants will receive YK-029A orally and pemetrexed/cisplatin or pemetrexed/carboplatin via vein until the participants experience worsening disease (PD) as assessed by blinded independent review committee (IRC), intolerable harmful effects or another discontinuation criteria.