Introduction: The JAVELIN Lung 101 phase 1b/2 trial evaluated avelumab (immune checkpoint inhibitor) combined with lorlatinib or crizotinib (tyrosine kinase inhibitors) in ALK -positive or ALK -negative advanced NSCLC, respectively., Methods: Starting doses of lorlatinib 100 mg once daily or crizotinib 250 mg twice daily were administered with avelumab 10 mg/kg every 2 weeks. Primary objectives were assessment of maximum tolerated dose (MTD) and recommended phase 2 dose in phase 1 and objective response rate in phase 2. Primary end points were dose-limiting toxicity (DLT) and confirmed objective response per Response Evaluation Criteria in Solid Tumors, version 1.1., Results: In the avelumab plus lorlatinib group ( ALK -positive; n = 31; 28 in phase 1b; three in phase 2), two of 28 assessable patients (7%) had DLT, and the MTD and recommended phase 2 dose was avelumab 10 mg/kg every 2 weeks plus lorlatinib 100 mg once daily. In the avelumab plus crizotinib group ( ALK -negative; n = 12; all phase 1b), five of 12 assessable patients (42%) had DLT, and the MTD was exceeded with avelumab 10 mg/kg every 2 weeks plus crizotinib 250 mg twice daily; alternative crizotinib doses were not assessed. Objective response rate was 52% (95% confidence interval, 33%-70%) with avelumab plus lorlatinib (complete response, 3%; partial response, 48%) and 25% (95% confidence interval, 6%-57%) with avelumab plus crizotinib (all partial responses)., Conclusions: Avelumab plus lorlatinib treatment in ALK -positive NSCLC was feasible, but avelumab plus crizotinib treatment in ALK -negative NSCLC could not be administered at the doses tested. No evidence of increased antitumor activity was observed in either group., Clinicaltrialsgov Identifier: NCT02584634., Competing Interests: Dr. Solomon reports providing a consulting or advisory role for Amgen, AstraZeneca, BeiGene, Bristol Myers Squibb, Cancer Council of Victoria, D3 Bio, Janssen, Lilly, the healthcare business of Merck KGaA, Darmstadt, Germany, Pfizer, Roche/Genentech, Takeda, and Thoracic Oncology Group of Australasia; has provided speaker services for Amgen, AstraZeneca, Pfizer, and Roche/Genentech; and has received institutional research funding from 10.13039/100017239BeiGene, 10.13039/100002491Bristol Myers Squibb, 10.13039/100020536Lilly, 10.13039/100004336Novartis, Nuvalent, 10.13039/100004319Pfizer, 10.13039/100004337Roche/10.13039/100004328Genentech, and 10.13039/100004339Sanofi. Prof. Dagogo-Jack reports providing a consulting or advisory role for AstraZeneca, Bayer, Boehringer Ingelheim, BostonGene, Catalyst Pharmaceuticals, Genentech, Janssen, Novocure, Pfizer, Sanofi, Syros Pharmaceuticals, and Xcovery; has received travel, accommodations, or expenses from Array BioPharma, Creative Educational Concepts, DAVA Oncology, Medscape, OncLive/MJH Life Sciences, Pfizer, The ASCO Post, and Total Health Conferencing; and has received institutional research funding from 10.13039/100007174Array BioPharma, 10.13039/100017658Calithera Biosciences, Genentech, Pfizer, 10.13039/100004336Novartis, and Vivace Therapeutics. Prof. Lee reports providing a consulting or advisory role for AstraZeneca/MedImmune, Bristol Myers Squibb, and Novartis; has received honoraria from AstraZeneca/MedImmune, the healthcare business of Merck KGaA, Darmstadt, Germany, and Roche; and has received travel, accommodations, or expenses from Novartis. Prof. Boyer reports providing a consulting or advisory role for AstraZeneca/MedImmune, Bristol Myers Squibb, and Merck & Co., Kenilworth, NJ; has received institutional research funding from 10.13039/100002429Amgen, 10.13039/100019621Ascentage Pharma, 10.13039/100004325AstraZeneca, 10.13039/100017239BeiGene, Boehringer Ingelheim, Bristol Myers Squibb, Lilly, 10.13039/100004334Merck & Co., Kenilworth, NJ, OncoMed, 10.13039/100012742Peregrine Pharmaceuticals, Pfizer, and Roche/Genentech; and has received travel, accommodations, or expenses from Boehringer Ingelheim, Bristol Myers Squibb, Merck & Co., Kenilworth, NJ, and Roche/Genentech. Prof. Ramalingam reports providing a consulting or advisory role for AbbVie, Amgen, AstraZeneca, Boehringer Ingelheim, Bristol Myers Squibb, Celgene, Lilly/ImClone, Roche/Genentech, Takeda, and the healthcare business of Merck KGaA, Darmstadt, Germany. Dr. Carcereny has no relationships to disclose. Prof. Felip reports providing a consulting or advisory role for AbbVie, Amgen, AstraZeneca, Bayer, Blueprint Medicines, Boehringer Ingelheim, Bristol Myers Squibb, Lilly, GlaxoSmithKline, Janssen, Merck & Co., Kenilworth, NJ, Novartis, Pfizer, Puma Biotechnology, Roche, Sanofi, Genzyme, Takeda, and the healthcare business of Merck KGaA, Darmstadt, Germany; has provided speaker services for AstraZeneca, Boehringer Ingelheim, Bristol Myers Squibb, Lilly, Medscape, Merck & Co., Kenilworth, NJ, Novartis, PeerVoice, Pfizer, Prime Oncology, Roche, Springer, Takeda, touchIME, and CME Outfitters; has received research funding from grant for Oncology Innovation, Fundación Merck Salud, Madrid, Spain, an affiliate of Merck KGaA, Darmstadt, Germany; and is an independent member of the board of Grifol. Dr. Han reports providing a consulting or advisory role for Merck & Co., Kenilworth, NJ; has received honoraria from Novartis; and has received institutional research funding from Roche. Dr. Hida has received honoraria from AstraZeneca, Boehringer Ingelheim, Bristol Myers Squibb, Chugai Pharma, Clovis Oncology, Kissei Pharmaceutical, Lilly, Merck & Co., Kenilworth, NJ, Novartis, Ono Pharmaceutical, Pfizer, and Taiho Pharmaceutical; and has received institutional research funding from 10.13039/100006483AbbVie, 10.13039/501100004948Astellas, AstraZeneca, Boehringer Ingelheim, Bristol Myers Squibb, Chugai Pharma, Clovis Oncology Daiichi Sankyo, 10.13039/501100002975Dainippon Sumitomo Pharma, 10.13039/501100003769Eisai, 10.13039/100014584Ignyta, 10.13039/100016288Kissei Pharmaceutical, 10.13039/501100004095Kyowa Hakko Kirin, 10.13039/100004334Merck & Co., Kenilworth, NJ, Novartis, Ono Pharmaceutical, Pfizer, Servier, 10.13039/100009954Taiho Pharmaceutical, Takeda, and the healthcare business of Merck KGaA, Darmstadt, Germany. Dr. Hughes reports providing a consulting or advisory role for AstraZeneca, Boehringer Ingelheim, Bristol Myers Squibb, Eisai, Pfizer, Merck & Co., Kenilworth, NJ, and Roche. Dr. Kim has no relationships to disclose. Dr. Nishio has received lecture fees from Chugai Pharmaceutical, Pfizer, Novartis, and Takeda. Dr. Seto has received honoraria from Astellas Pharma, AstraZeneca, Boehringer Ingelheim, Bristol Myers Squibb, Chugai Pharma, Kissei Pharmaceutical, Kyowa Hakko Kirin, Lilly Japan, Merck & Co., Kenilworth, NJ, Nippon Kayaku, Ono Pharmaceutical, Pfizer, Roche Singapore, Taiho Pharmaceutical, Takeda, and Yakult Honsha; and has received institutional research funding from Astellas Pharma, AstraZeneca, 10.13039/100015731Bayer Yakuhin, Boehringer Ingelheim, Chugai Pharma, Daiichi Sankyo, Eisai, Kissei Pharmaceutical, Lilly, Merck & Co., Kenilworth, NJ, Novartis, Pfizer, and the healthcare business of Merck KGaA, Darmstadt, Germany. Dr. Okamoto has received honoraria from AstraZeneca, Bristol Myers Squibb, Chugai Pharmaceutical, Eli Lilly, Johnson & Johnson, Merck & Co., Kenilworth, NJ, Boehringer Ingelheim, Nippon Kayaku, Novartis, Ono Pharmaceutical, and Taiho Pharmaceutical; and has received institutional research funding from AnHeart Therapeutics, AstraZeneca, Bristol Myers Squibb, Chugai Pharmaceutical, Covidien Japan, Daiichi Sankyo, Lilly, KM Biologics, the healthcare business of Merck KGaA, Darmstadt, Germany, Merck & Co., Kenilworth, NJ, Boehringer Ingelheim, Nippon Kayaku, Novartis, Pfizer, and Taiho Pharmaceutical. Dr. Zhang is an employee of Pfizer and owns stock and has other ownership interests in Pfizer. Dr. Martini is an employee of Pfizer and owns stock and has other ownership interests in Pfizer. Dr. Wang was an employee of Pfizer at the time this study was conducted. Dr. De Beukelaer was an employee of Pfizer at the time this study was conducted and owns stock and has other ownership interests in Pfizer. Dr. Bauer reports providing a consulting or advisory role for AstraZeneca, Bayer, Lilly, and Pfizer; has provided speaker services for Bayer, Bristol Myers Squibb, Lilly, and Pfizer; and has received institutional research funding from AstraZeneca, Bayer, Bristol Myers Squibb, Lilly, and Pfizer., (© 2024 by the International Association for the Study of Lung Cancer.)