2016
DOI: 10.1200/jco.2016.34.15_suppl.3025
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PD-L1 expression in advanced NSCLC: Primary lesions versus metastatic sites and impact of sample age.

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Cited by 24 publications
(20 citation statements)
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“…90 From the 22C3 and 28-8 pharmDx (Dako 22C3 pharmDx and Dako 28-8 pharmDx) interpretation manuals, a critical step for PD-L1 IHC is a short fixation time of less than 3 hours; other parameters such as prolonged fixation, paraffin embedding, dehydration, and use of unstained slides are not critical issues, as long as unstained slides are less than 6 months old. Specimen age for PD-L1 testing should be less than 3 years, as advanced age of tissue blocks in one PD-L1 study 91 for the ATLANTIC phase II trial showed a similar percentage for tumor proportion score that was greater than 25% (around 30%), which dropped for specimens older than 3 years (14%).…”
Section: Analytic Issuesmentioning
confidence: 99%
“…90 From the 22C3 and 28-8 pharmDx (Dako 22C3 pharmDx and Dako 28-8 pharmDx) interpretation manuals, a critical step for PD-L1 IHC is a short fixation time of less than 3 hours; other parameters such as prolonged fixation, paraffin embedding, dehydration, and use of unstained slides are not critical issues, as long as unstained slides are less than 6 months old. Specimen age for PD-L1 testing should be less than 3 years, as advanced age of tissue blocks in one PD-L1 study 91 for the ATLANTIC phase II trial showed a similar percentage for tumor proportion score that was greater than 25% (around 30%), which dropped for specimens older than 3 years (14%).…”
Section: Analytic Issuesmentioning
confidence: 99%
“…Ces données sont toutefois contredites par une étude s'intéressant aux cancers bronchiques, présentée récemment à l'ASCO [26], ne retrouvant pas de différence majeure entre le statut PD-L1 des échantillons récents ou anciens d'un même patient (concordance de 76 % quand la différence d'âge des échantillons est inférieure à 3 ans), ni de différence d'expression entre la tumeur primaire et la métastase (concordance de 88,6 %). Le clone SP 263 de Ventana a été utilisé pour un cut-off de 25 % d'expression sur les cellules tumorales.…”
Section: L'expression De Pd-1/pd-l1unclassified
“…The pharmaceutical action is based on the inhibition of PD1 or PD-L1 and tackled by five different agents, each with its own PD-L1 antibody: nivolumab with 28-8 rabbit antibody [93]; pembrolizumab with 22C3 mouse antibody [94]; atezolizumab with SP142 rabbit antibody; durvalumab with SP263 rabbit antibody [95]; and avelumab with rabbit antibody 73- The tissue handling procedure for PD-L1 IHC does not principally differ from other diagnostic or predictive IHC markers such as ALK [97]. Critical analytical steps are minimum fixation time of 3-6 h; cut unstained slides, preferably not older than 3-6 months and specimen age <3 years [98]. The use of PD-L1 IHC on decalcified tissues should be interpreted with caution until further validation studies on PD-L1 IHC have become available.…”
Section: Pd-l1mentioning
confidence: 99%