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Introduction: The primary analysis (median follow-up 34.9 mo across all arms) of the phase 3 POSEIDON study revealed a statistically significant overall survival (OS) improvement with first-line tremelimumab plus durvalumab and chemotherapy (T+D+CT) versus CT in patients with EGFR and ALK wild-type metastatic NSCLC (mNSCLC). D+CT had a trend for OS improvement versus CT that did not reach statistical significance. This article reports prespecified OS analyses after long-term follow-up (median >5 y)., Methods: A total of 1013 patients were randomized (1:1:1) to T+D+CT, D+CT, or CT, stratified by tumor cell programmed cell death ligand-1 (PD-L1) expression (≥50% versus <50%), disease stage (IVA versus IVB), and tumor histologic type (squamous versus nonsquamous). Serious adverse events were collected during follow-up., Results: After a median follow-up of 63.4 months across all arms, T+D+CT had sustained OS benefit versus CT (hazard ratio [HR] = 0.76, 95% confidence interval [CI]: 0.64-0.89; 5-y OS: 15.7% versus 6.8%). OS improvement with D+CT versus CT (HR = 0.84, 95% CI: 0.72-1.00; 5-y OS: 13.0%) was consistent with the primary analysis. OS benefit with T+D+CT versus CT remained more pronounced in nonsquamous (HR = 0.69, 95% CI: 0.56-0.85) versus squamous (HR = 0.85, 95% CI: 0.65-1.10) mNSCLC. OS benefit with T+D+CT versus CT was still evident regardless of PD-L1 expression, including patients with PD-L1 tumor cell less than 1%, and remained evident in STK11-mutant (nonsquamous), KEAP1-mutant, and KRAS-mutant (nonsquamous) mNSCLC. No new safety signals were identified., Conclusions: After a median follow-up of more than 5 years, T+D+CT had durable long-term OS benefit versus CT, supporting its use as first-line treatment in mNSCLC, including in patient subgroups with harder-to-treat disease., Competing Interests: Disclosure Peters has received grants (paid to institution) from Amgen, Arcus, AstraZeneca, BeiGene, Boehringer Ingelheim, Bristol-Myers Squibb, F. Hoffmann-La Roche/Genentech, GlaxoSmithKline, iTeos, Merck Sharp & Dohme, Merck Serono, Mirati, PharmaMar, Promontory Therapeutics, and Seattle Genetics; has received payment or honoraria for lectures, presentations, speakers bureaus, manuscript writing, or educational events (paid to institution) from AiCME, AstraZeneca, Boehringer Ingelheim, Bristol-Myers Squibb, ecancer, Eli Lilly, F. Hoffmann-La Roche/Genentech, Foundation Medicine, GlaxoSmithKline, Illumina, Imedex, Ipsen, Medscape, Merck Sharp & Dohme, Mirati, MJH Life Sciences, Novartis, Peerview, Pfizer, RTP, and Takeda; and has participation on a data safety monitoring board or advisory board (payment to institution) for AbbVie, AiCME, Amgen, Arcus, AstraZeneca, Bayer, BeiGene, BerGenBio, Biocartis, Bioinvent, Blueprint Medicines, Boehringer Ingelheim, Bristol-Myers Squibb, Clovis, Daiichi Sankyo, Debiopharm, ecancer, Eli Lilly, Elsevier, F. Hoffmann-La Roche/Genentech, Fishawack, Foundation Medicine, F-Star, Genzyme, Gilead, GlaxoSmithKline, Hutchmed, Illumina, Imedex, Incyte, Ipsen, IQVIA, iTeos, Janssen, Medscape, Medtoday, Merck Sharp & Dohme, Merck Serono, Merrimack, Mirati, MJH Life Sciences, Novartis, Novocure, Nykode Therapeutics, OncologyEducation, Peerview, Pharma Mar, Pfizer, Promontory Therapeutics, Regeneron, RMEI, RTP, Sanofi, Seattle Genetics, and Takeda. Cho reports receiving research funding from MOGAM Institute, LG Chem, Oscotec, Interpark Bio Convergence Corp., GIInnovation, GI-Cell, Abion, AbbVie, AstraZeneca, Bayer, Blueprint Medicines, Boehringer Ingelheim, Champions Oncology, CJ Bioscience, CJ Blossom Park, Cyrus, Dizal Pharma, Genexine, Janssen, Lilly, Merck Sharp & Dohme, Novartis, Nuvalent, Oncternal, Ono, Regeneron, Dong-A ST, Bridgebio Therapeutics, Yuhan, ImmuneOncia, Illumina, Kanaph Therapeutics, Therapex, JINTSbio, Hanmi, CHA Bundang Medical Center, and Vertical Bio AG; receiving royalties from Champions Oncology, Crown Bioscience, Imagen, and PearlRiver Bio GmbH; receiving consulting fees from Abion, BeiGene, Novartis, AstraZeneca, Boehringer Ingelheim, Roche, Bristol-Myers Squibb, CJ, CureLogen, Cyrus Therapeutics, Ono, Onegene Biotechnology, Yuhan, Pfizer, Eli Lilly, GI-Cell, Guardant, HK Inno-N, Imnewrun Biosciences Inc., Janssen, Takeda, Merck Sharp & Dohme, Janssen, Medpacto, Blueprint Medicines, RandBio, and Hanmi; receiving payment or honoraria for presentations from ASCO, AstraZeneca, Guardant, Roche, ESMO, International Association for the Study of Lung Cancer, Korean Cancer Association, Korean Society of Medical Oncology, Korean Society of Thyroid-Head and Neck Surgery, Korean Cancer Study Group, Novartis, Merck Sharp & Dohme, The Chinese Thoracic Oncology Society, and Pfizer; having scientific advisory board participation for Kanaph Therapeutics Inc., Bridgebio Therapeutics, Cyrus Therapeutics, Guardant Health, Oscotec Inc., J INTS Bio, Therapex Co., Ltd., Gilead, and Amgen; having membership of the board of directors for J INTS BIO; having stock ownership in TheraCanVac Inc., Gencurix Inc., Bridgebio Therapeutics, Kanaph Therapeutics Inc., Cyrus Therapeutics, Interpark Bio Convergence Corp., and J INTS BIO; having employment with Yonsei University Health System; and being a founder of DAAN Biotherapeutics. Alatorre-Alexander has received payment or honoraria for lectures, presentations, speakers bureaus, manuscript writing, or educational events from Amgen, AstraZeneca, Bristol-Myers Squibb, Janssen, Merck Sharp & Dohme, and Roche; received support for attending meetings and/or travel from AstraZeneca, Merck Sharp & Dohme, and Roche; and participated on a data safety monitoring board or advisory board for Amgen, AstraZeneca, Bristol-Myers Squibb, Janssen, Merck Sharp & Dohme, and Roche. Geater has received research funding (paid to institution) from AstraZeneca, Boehringer Ingelheim, Merck Sharp & Dohme, Novartis, and Roche; received honoraria from AstraZeneca and Boehringer Ingelheim; and performed an advisory role for Merck Sharp & Dohme and Pfizer. Laktionov has received payment or honoraria for lectures, presentations, speakers bureaus, manuscript writing, or educational events for AstraZeneca, Biocad, Bristol-Myers Squibb, Merck Sharp & Dohme, and Roche AG, and has participated on a data safety monitoring board or advisory board for AstraZeneca, Biocad, Bristol-Myers Squibb, Merck Sharp & Dohme, Pfizer, and Roche AG. Kim has received grants (paid to institution) from Yuhan and support for attending an investigator meeting from AstraZeneca. Hussein has received consulting fees from IntegraConnect, Coherus Biosciences, Athenex, Karyopharm Therapeutics, Bristol-Myers Squibb, AstraZeneca, Mirati Therapeutics, Exelixis, Biopharma, Oncocyte, Aptitude Health, IntrinsiQ, GIntrinsiQ, National Community Oncology Dispensing Association, Integra PrescisionQ, AbbVie, and CTI BioPharma Corp. Araujo has received grants from Lilly, Boehringer, Merck Sharp & Dohme, Bristol-Myers Squibb, Roche, Pfizer, AstraZeneca, Novartis, and Merck; consulting fees from Merck Sharp & Dohme, Roche, AstraZeneca, Bristol-Myers Squibb, Lilly, Illumina, and Sanofi; payment or honoraria for lectures, presentations, speakers bureaus, manuscript writing, or educational events from Merck Sharp & Dohme, Bristol-Myers Squibb, AstraZeneca, Boehringer, Merck, Roche, Pfizer, and Lilly; and support for attending meetings and/or travel from Daiichi Sankyo, Bristol-Myers Squibb, and AstraZeneca. Saito has received grants from AstraZeneca, Bristol-Myers Squibb, Chugai Pharmaceutical, and ONO Pharmaceutical, and payment or honoraria for lectures, presentations, speakers bureaus, manuscript writing, or educational events from AstraZeneca, Boehringer Ingelheim, Bristol-Myers Squibb, Chugai Pharmaceutical, ONO Pharmaceutical, and Pfizer. Reinmuth has received consulting fees from Amgen, AstraZeneca, Bristol-Myers Squibb, Daiichi Sankyo, GlaxoSmithKline, Hoffmann-La Roche, Janssen, Merck Sharp & Dohme, and Pfizer; received payment or honoraria for lectures, presentations, speakers bureaus, manuscript writing, or educational events from Amgen, AstraZeneca, Bristol-Myers Squibb, Boehringer Ingelheim, Daiichi Sankyo, Eli Lilly, GlaxoSmithKline, Hoffmann-La Roche, Janssen, Merck Sharp & Dohme, Pfizer, Sanofi, and Takeda; received support for attending meetings and/or travel from Janssen, Sanofi, and Takeda; and participated on a data safety monitoring board or advisory board for Symphogen. Lowery, Mann, Stewart, and Jiang are employees of, and own stocks in, AstraZeneca. Garon has received grants paid to their institution from ABL-Bio, AstraZeneca, Bristol-Myers Squibb, Daiichi Sanko, Dynavax Technologies, Eli Lilly, EMD Serono, Genentech, Gilead, Iovance Biotherapeutics, Merck, Mirati Therapeutics, Neon, and Novartis; consulting fees paid to their institution from AbbVie, ABL-Bio, AstraZeneca, Boehringer Ingelheim, Bristol-Myers Squibb, Dracen Pharmaceuticals, EMD Serono, Eisai, Eli Lilly, Gilead, GlaxoSmithKline, Merck, Natera, Novartis, Personalis, Regeneron, Sanofi, Shionogi, Xilio, and Zymeworks; and support for attending meetings and/or travel from A2 Bio and Novartis. Mok reports receiving grants paid to their institution from AstraZeneca, Bristol-Myers Squibb, G1 Therapeutics, Merck Sharp & Dohme, Merck Serono, Novartis, Pfizer, Roche, SFJ, Takeda, and Xcovery; consulting fees from AbbVie Inc., ACEA Pharma, Adagene, Alpha Biopharma Co., Ltd., Amgen, Amoy Diagnostics Co., AVEO Pharmaceuticals, Inc., Bayer Healthcare Pharmaceuticals Ltd., BeiGene, Berry Oncology, Boehringer Ingelheim, Blueprint Medicines Corporation, Bristol-Myers Squibb, Bowtie Life Insurance Company Limited, Bridge Biotherapeutics Inc., Covidien LP, C4 Therapeutics Inc., Cirina Ltd., CStone Pharmaceuticals, Curio Science, D3 Bio Ltd., Da Volterra, Daiichi Sankyo, Eisai, Elevation Oncology, F. Hoffmann-La Roche Ltd./Genentech, Fishawack Facilitate Ltd., G1 Therapeutics Inc., geneDecode Co., Ltd., Gilead Sciences, Inc., GLG’s Healthcare, Gritstone Oncology, Inc., Guardant Health, Hengrui Therapeutics Inc., HutchMed, Ignyta, Inc., Illumina Inc., Incyte Corporation, Inivata, IQVIA, Janssen, Lakeshore Biotech Ltd., Lilly, Lunit USA, Inc., Loxo-Oncology, Lucence Health Inc., Medscape LLC/WebMD, Medtronic, Merck Serono, Merck Sharp & Dohme, Mirati Therapeutics Inc., MiRXES, MoreHealth, Novartis, Novocure GmbH, Omega Therapeutics Inc., OrigiMed, OSE Immunotherapeutics, PeerVoice, Pfizer, PrIME Oncology, Prenetics, Puma Biotechnology Inc., Qiming Development (HK) Ltd., Regeneron Pharmaceuticals Inc., Roche Pharmaceuticals/Diagnostics/Foundation One, Sanofi-Aventis, SFJ Pharmaceutical Ltd., Simcere of America Inc., Synergy Research, Summit Therapeutics Sub, Inc., Takeda Pharmaceuticals HK Ltd., Tigermed, Vertex Pharmaceuticals, Virtus Medical Group, XENCOR, Inc., and Yuhan Corporation; receiving payment or honoraria for lectures, presentations, speakers bureaus, manuscript writing, or educational events from ACEA Pharma, Alpha Biopharma Co. Ltd., Amgen, Amoy Diagnostics Co. Ltd., AstraZeneca (before January 1, 2019), BeiGene, Boehringer Ingelheim, Bristol-Myers Squibb, Daiichi Sankyo, Daz Group, Fishawack Facilitate Ltd., InMed Medical Communications, Janssen Pharmaceutica NV, Jiahui Holdings Co. Ltd., LiangYiHui Healthcare, Lilly, Lucence Health Inc., MD Health Brazil, Medscape LLC, Merck Pharmaceuticals HK Ltd., Merck Sharp & Dohme, MiRXES, Novartis, OrigiMed Co. Ltd., P. Permanyer SL, PeerVoice, Physicians’ Education Resource, Pfizer, PrIME Oncology, Research to Practice, Roche Pharmaceuticals/Diagnostics/Foundation One, Sanofi-Aventis, Shanghai BeBirds Translation & Consulting Co. Ltd., Taiho Pharmaceutical Co. Ltd., Takeda Oncology, and Touch Independent Medical Education Ltd.; receiving support for attending meetings and/or travel from Boehringer Ingelheim, Pfizer, Bristol-Myers Squibb, Merck Sharp & Dohme (paid to institution), Novartis, Roche (paid to self and institution), AstraZeneca, Daiichi Sankyo, MiRXES, AbbVie, Zai Lab, and Liangyihui (paid to self); having participation on a data safety monitoring board or advisory board for AbbVie Inc., ACEA Pharma, Amgen, AstraZeneca, Berry Oncology, Blueprint Medicines Corporation, Boehringer Ingelheim, Bowtie Life Insurance Co., Ltd., Bristol-Myers Squibb, C4 Therapeutics Inc., Covidien LP, CStone Pharmaceuticals, Curio Science, D3 Bio Ltd., Daiichi Sankyo Inc., Eisai, Fishawack Facilitate Ltd., G1 Therapeutics Inc., Gilead Sciences Inc., Gritstone Oncology Inc., Guardant Health, geneDecode Co. Ltd. (uncompensated), Hengrui Therapeutics Inc., HutchMed, Ignyta Inc., Incyte Corporation, Imagene AI Ltd., Inivata, IQVIA, Janssen, Lakeshore Biotech, Lilly, Loxo-Oncology Inc., Lunit Inc., Merck Serono, Merck Sharp & Dohme, Mirati Therapeutics Inc., MiRXES Group, Novartis, OrigiMed, Pfizer, Puma Biotechnology Inc., Roche/Genentech, Regeneron Pharmaceuticals Inc., Sanofi-Aventis R&D, SFJ Pharmaceutical, Simcere of America Inc., Simcere Zaiming, Inc., Takeda, Vertex Pharmaceuticals, Virtus Medical Group, XENCOR, Inc., and Yuhan Corporation; having leadership or fiduciary role in other board, society, committee, or advocacy group, paid or unpaid, with AstraZeneca PLC, HutchMed, and Aurora; and having stock or stock options in AstraZeneca, Aurora Tele-Oncology Ltd., Biolidics Ltd., HutchMed, Prenetics, D3 Bio, Lunit, Bowtie Life Insurance, Lakeshore Biotech Ltd., Loxo-oncology, Virtus Medical Group, and Phanes Therapeutics, Inc. Johnson has received research funding paid to their institution from AbbVie, Acerta, Adaptimmune, Amgen, Apexigen, Arcus Biosciences, Array BioPharma, Artios Pharma, AstraZeneca, Atreca, BeiGene, BerGenBio, BioAtla, Black Diamond, Boehringer Ingelheim, Calithera Biosciences, Carisma Therapeutics, Corvus Pharmaceutical, Curis, CytomX, Daiichi Sankyo, Dracen Pharmaceuticals, Dynavax, Lilly, Elicio Therapeutics, EMD Serono, EQRx, Erasca, Exelixis, Fate Therapeutics, Genentech/Roche, Genmab, Genocea Biosciences, GlaxoSmithKline, Gritstone Oncology, Guardant Health, Harpoon, Helsinn Healthcare SA, Hengrui Therapeutics, Hutchison MediPharma, IDEAYA Biosciences, IGM Biosciences, Immunitas Therapeutics, Immunocore, Incyte, Janssen, Kadmon Pharmaceuticals, Kartos Therapeutics, Loxo-Oncology, Lycera, Memorial Sloan-Kettering, Merck, Merus, Mirati Therapeutics, NeoImmune Tech, Neovia Oncology, Novartis, Numab Therapeutics, Nuvalent, OncoMed Pharmaceuticals, Palleon Pharmaceuticals, Pfizer, PMV Pharmaceuticals, Rain Therapeutics, Regeneron Pharmaceuticals, Relay Therapeutics, Revolution Medicines, Ribon Therapeutics, Rubius Therapeutics, Sanofi, Seven and Eight Biopharmaceuticals/Birdie Biopharmaceuticals, Shattuck Labs, Silicon Therapeutics, Stem CentRx, Syndax Pharmaceuticals, Takeda Pharmaceuticals, Tarveda, TCR2 Therapeutics, Tempest Therapeutics, Tizona Therapeutics, TMUNITY Therapeutics, Turning Point Therapeutics, University of Michigan, Vyriad, Y-mAbs Therapeutics, Bristol-Myers Squibb, Checkpoint Therapeutics, City of Hope National Medical Center, Jounce Therapeutics, Mythic Therapeutics, RasCal Therapeutics, WindMIL Therapeutics, ArriVent BioPharma, Bayer, LockBody Therapeutics, and Taiho Oncology; and receiving consulting fees paid to their institution from AbbVie, Amgen, Arrivent, Alentis Therapeutics, AstraZeneca, Bristol-Myers Squibb, D3 Bio Limited, Daiichi Sankyo, Fate Therapeutics, Genentech/Roche, Genmab, Genocea Biosciences, GlaxoSmithKline, Gritstone Oncology, Hookipa Biotech, Janssen, Merck, Mirati Therapeutics, Molecular Axiom, Novartis, Pyramid Biosciences, Revolution Medicines, Sanofi-Aventis, SeaGen, Takeda Pharmaceuticals, VBL Therapeutics, Arcus Biosciences, Immunocore, Jazz Pharmaceuticals, Synthekine, Boehringer Ingelheim, Gilead Sciences, Normunity, Lilly, Novocure, and Pfizer. The remaining authors delcare no conflict of interest., (Copyright © 2024 International Association for the Study of Lung Cancer. Published by Elsevier Inc. All rights reserved.)

Keratinocytes produce lipids that are critical for the skin barrier, however, little is known about the impact of age on fatty acid (FA) biosynthesis in these cells. We have examined the relationship between keratinocyte FA composition, lipid biosynthetic gene expression, gene promoter methylation and age. Expression of elongase (ELOVL6 and 7) and desaturase (FADS1 and 2) genes was lower in adult versus neonatal keratinocytes, and was associated with lower concentrations of n-7, n-9 and n-10 polyunsaturated FA in adult cells. Consistent with these findings, transient FADS2 knockdown in neonatal keratinocytes mimicked the adult keratinocyte FA profile in neonatal cells. Interrogation of methylation levels across the FADS2 locus (53 genomic sites) revealed differential methylation of 15 sites in neonatal versus adult keratinocytes, of which three hypermethylated sites in adult keratinocytes overlapped with a SMARCA4 protein binding site in the FADS2 promoter., Competing Interests: Declaration of competing interest Messenger D.J.(2), Barrett K.E.(2), Hyliands D.(2), Talbot D.(2), Fowler M.I.(2), Kawatra T.(2), Gunn D.A.(2), Lim FL.(2), Wainwright L.J.(2), Jenkins G.(2), are employed by Unilever R&D. Griffiths H.R.(1,3) received part funding from Unilever R&D and BBSRC to undertake this study., (Copyright © 2022 The Authors. Published by Elsevier Inc. All rights reserved.)

The in situ control of redox insult in human organs is of major clinical relevance, yet remains incompletely understood. Activation of nuclear factor (erythroid-derived 2)-like 2 (Nrf2), the "master regulator" of genes controlling cellular redox homeostasis, is advocated as a therapeutic strategy for diseases with severely impaired redox balance. It remains to be shown whether this strategy is effective in human organs, rather than only in isolated human cell types. We have therefore explored the role of Nrf2 in a uniquely accessible human (mini-) organ: scalp hair follicles. Microarray and qRT-PCR analysis of human hair follicles after Nrf2 activation using sulforaphane identified the modulation of phase II metabolism, reactive oxygen species clearance, the pentose phosphate pathway, and glutathione homeostasis. Nrf2 knockdown (small interfering RNA) in cultured human hair follicles confirmed the regulation of key Nrf2 target genes (i.e., heme oxygenase-1, NAD(P)H dehydrogenase, quinone 1, glutathione reductase, glutamate-cysteine ligase catalytic subunit, ABCC1, peroxiredoxin 1). Importantly, Nrf2 activation significantly reduced reactive oxygen species levels and associated lipid peroxidation. Nrf2 preactivation reduced premature catagen and hair growth inhibition induced by oxidative stress (H 2 O 2 or menadione), significantly ameliorated the H 2 O 2 -dependent increase in matrix keratinocyte apoptosis and reversed the reactive oxygen species-induced reduction in hair matrix proliferation. This study thus provides direct evidence for the crucial role of Nrf2 in protecting human organ function (i.e., scalp hair follicles) against redox insult., (Copyright © 2016 The Authors. Published by Elsevier Inc. All rights reserved.)

There are few studies on sick building syndrome (SBS) including clinical measurements for atopy and fractional exhaled nitric oxide (FeNO). Our aim was to study associations between SBS symptoms, selected personal factors, office characteristics and indoor office exposures among office workers from a university in Malaysia. Health data were collected by a questionnaire (n=695), skin prick test (SPT) (n=463) and FeNO test (n=460). Office settled dust was vacuumed and analyzed for endotoxin, (1,3)-β-glucan and house dust mites (HDM) allergens group 1 namely Dermatophagoides pteronyssinus (Der p 1) and Dermatophagoides farinae (Der f 1). Office indoor temperature, relative air humidity (RH), carbon monoxide (CO) and carbon dioxide (CO2) were measured by a direct reading instrument. Associations were studied by two-levels multiple logistic regression with mutual adjustment and stratified analysis. The prevalence of weekly dermal, mucosal and general symptoms was 11.9%, 16.0% and 23.0% respectively. A combination of SPT positivity (allergy to HDM or cat) and high FeNO level (≥25 ppb) was associated with dermal (p=0.002), mucosal (p<0.001) and general symptoms (p=0.05). Der f1 level in dust was associated with dermal (p<0.001), mucosal (p<0.001) and general (p=0.02) symptoms. Among those with allergy to D. farinae, associations were found between Der f 1 levels in dust and dermal (p=0.003), mucosal (p=0.001) and general symptoms (p=0.007). Office-related symptoms were associated with Der f 1 levels in dust (p=0.02), low relative air humidity (p=0.04) and high office temperature (p=0.05). In conclusion, a combination of allergy to cat or HDM and high FeNO is a risk factor for SBS symptoms. Der f 1 allergen in dust can be a risk factor for SBS in the office environment, particularly among those sensitized to Der f 1 allergen., (Copyright © 2015 Elsevier B.V. All rights reserved.)

We have used global gene expression profiling, combined with pathway analysis tools, to identify in rats the molecular events associated with paraquat toxicity in the lung. Early (2, 8 and 18h) gene expression changes induced following intraperitoneal (i.p.) exposure to paraquat were measured in the caudal lobe of lungs using Affymetrix rat genome GeneChips (31,042 probe sets). A single high dose of paraquat dichloride (20mg/kg) was used that has been shown previously to cause in rats extensive lung fibrosis after 10 days. Hierarchical clustering of 543 paraquat-responsive genes (false discovery rate<0.05) revealed that under these conditions of exposure paraquat induces a staged transcriptional response in the rat lung that precedes the appearance of lung damage. We report here that many of the transcriptional responses to paraquat were rapid (being maximal at 2h post-dose), and that the predominant molecular functions and biological processes associated with these genes include membrane transport, oxidative stress, lung development, epithelial cell differentiation and transforming growth factor beta (TGF-beta) signalling. These data provide novel insights into the molecular pathways that lead to toxicity after exposure of the rat lung to paraquat.