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Comprehensive Comparison of 22C3 and SP263 PD-L1 Expression in Non-Small-Cell Lung Cancer Using Routine Clinical and Conditioned Archives

SIMPLE SUMMARY: The PD-L1 22C3 and SP263 assays are routinely used to select patients for immunotherapy in NSCLC, and their IHC expression results demonstrate a strong correlation. However, their interchangeability should be carefully examined when using long-term preserved FFPE blocks more than 3 y...

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Autores principales: Kim, Sue Youn, Kim, Tae-Eun, Park, Chan Kwon, Yoon, Hyoung-Kyu, Sa, Young Jo, Kim, Hyo Rim, Woo, In Sook, Kim, Tae-Jung
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9265108/
https://www.ncbi.nlm.nih.gov/pubmed/35804910
http://dx.doi.org/10.3390/cancers14133138
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author Kim, Sue Youn
Kim, Tae-Eun
Park, Chan Kwon
Yoon, Hyoung-Kyu
Sa, Young Jo
Kim, Hyo Rim
Woo, In Sook
Kim, Tae-Jung
author_facet Kim, Sue Youn
Kim, Tae-Eun
Park, Chan Kwon
Yoon, Hyoung-Kyu
Sa, Young Jo
Kim, Hyo Rim
Woo, In Sook
Kim, Tae-Jung
author_sort Kim, Sue Youn
collection PubMed
description SIMPLE SUMMARY: The PD-L1 22C3 and SP263 assays are routinely used to select patients for immunotherapy in NSCLC, and their IHC expression results demonstrate a strong correlation. However, their interchangeability should be carefully examined when using long-term preserved FFPE blocks more than 3 years or paraffin sections held for more than one week at room temperature conditions, where the PD-L1 sensitivity of SP263 is superior to that of 22C3. ABSTRACT: PD-L1 harmonization studies revealed a strong correlation between the 22C3 and SP263 assays in non-small-cell lung cancer (NSCLC). However, the assays’ characteristics have yet to be validated in a variety of clinical and analytical settings. The results of 431 NSCLC samples tested concurrently in routine clinical practice with the PD-L1 22C3 and SP263 assays were reviewed, and both assays were performed on 314 archives of surgically resected NSCLCs to assess PD-L1 expression in relation to variables such as FFPE block age and FFPE section storage condition. In routine clinical samples, 22C3 showed the highest concordance rate with 94.5% of SP263 tumor proportion score (TPS) ≥50% and 92.3% of SP263 TPS ≥1%, while SP263 showed a concordance rate with 79.6% of 22C3 TPS ≥50% and 89.9% of 22C3 TPS ≥1%. In the archival analysis, the high TPS of 22C3 and SP263 (versus TPS 1%) were significantly associated with a more recent block (<3 years versus ≥3 years) ([Formula: see text] = 0.007 and [Formula: see text] = 0.009, respectively). Only the TPS of 22C3 was reduced when FFPE sections were stored at room temperature compared to SP263. However, when stored at 4 °C, the storage duration had no effect on expression in either assay. For 22C3 TPS 1–49 percent and ≥50 percent (OR = 1.73, [Formula: see text] = 0.006 and OR = 1.98, [Formula: see text] = 0.002, respectively). There was a considerably larger chance of preserved 22C3 expression in recent room-temperature paraffin section storage, although SP263 demonstrated preserved expression in prolonged room-temperature section storage. Despite the good association between PD-L1 22C3 and SP263 in routine clinical samples, FFPE blocks older than 3 years and sections held at room temperature for more than 1 week may result in an underestimation of PD-L1 status, particularly for the 22C3 test. However, the SP263 assay was more sensitive under these conditions.
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spelling pubmed-92651082022-07-09 Comprehensive Comparison of 22C3 and SP263 PD-L1 Expression in Non-Small-Cell Lung Cancer Using Routine Clinical and Conditioned Archives Kim, Sue Youn Kim, Tae-Eun Park, Chan Kwon Yoon, Hyoung-Kyu Sa, Young Jo Kim, Hyo Rim Woo, In Sook Kim, Tae-Jung Cancers (Basel) Article SIMPLE SUMMARY: The PD-L1 22C3 and SP263 assays are routinely used to select patients for immunotherapy in NSCLC, and their IHC expression results demonstrate a strong correlation. However, their interchangeability should be carefully examined when using long-term preserved FFPE blocks more than 3 years or paraffin sections held for more than one week at room temperature conditions, where the PD-L1 sensitivity of SP263 is superior to that of 22C3. ABSTRACT: PD-L1 harmonization studies revealed a strong correlation between the 22C3 and SP263 assays in non-small-cell lung cancer (NSCLC). However, the assays’ characteristics have yet to be validated in a variety of clinical and analytical settings. The results of 431 NSCLC samples tested concurrently in routine clinical practice with the PD-L1 22C3 and SP263 assays were reviewed, and both assays were performed on 314 archives of surgically resected NSCLCs to assess PD-L1 expression in relation to variables such as FFPE block age and FFPE section storage condition. In routine clinical samples, 22C3 showed the highest concordance rate with 94.5% of SP263 tumor proportion score (TPS) ≥50% and 92.3% of SP263 TPS ≥1%, while SP263 showed a concordance rate with 79.6% of 22C3 TPS ≥50% and 89.9% of 22C3 TPS ≥1%. In the archival analysis, the high TPS of 22C3 and SP263 (versus TPS 1%) were significantly associated with a more recent block (<3 years versus ≥3 years) ([Formula: see text] = 0.007 and [Formula: see text] = 0.009, respectively). Only the TPS of 22C3 was reduced when FFPE sections were stored at room temperature compared to SP263. However, when stored at 4 °C, the storage duration had no effect on expression in either assay. For 22C3 TPS 1–49 percent and ≥50 percent (OR = 1.73, [Formula: see text] = 0.006 and OR = 1.98, [Formula: see text] = 0.002, respectively). There was a considerably larger chance of preserved 22C3 expression in recent room-temperature paraffin section storage, although SP263 demonstrated preserved expression in prolonged room-temperature section storage. Despite the good association between PD-L1 22C3 and SP263 in routine clinical samples, FFPE blocks older than 3 years and sections held at room temperature for more than 1 week may result in an underestimation of PD-L1 status, particularly for the 22C3 test. However, the SP263 assay was more sensitive under these conditions. MDPI 2022-06-27 /pmc/articles/PMC9265108/ /pubmed/35804910 http://dx.doi.org/10.3390/cancers14133138 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Kim, Sue Youn
Kim, Tae-Eun
Park, Chan Kwon
Yoon, Hyoung-Kyu
Sa, Young Jo
Kim, Hyo Rim
Woo, In Sook
Kim, Tae-Jung
Comprehensive Comparison of 22C3 and SP263 PD-L1 Expression in Non-Small-Cell Lung Cancer Using Routine Clinical and Conditioned Archives
title Comprehensive Comparison of 22C3 and SP263 PD-L1 Expression in Non-Small-Cell Lung Cancer Using Routine Clinical and Conditioned Archives
title_full Comprehensive Comparison of 22C3 and SP263 PD-L1 Expression in Non-Small-Cell Lung Cancer Using Routine Clinical and Conditioned Archives
title_fullStr Comprehensive Comparison of 22C3 and SP263 PD-L1 Expression in Non-Small-Cell Lung Cancer Using Routine Clinical and Conditioned Archives
title_full_unstemmed Comprehensive Comparison of 22C3 and SP263 PD-L1 Expression in Non-Small-Cell Lung Cancer Using Routine Clinical and Conditioned Archives
title_short Comprehensive Comparison of 22C3 and SP263 PD-L1 Expression in Non-Small-Cell Lung Cancer Using Routine Clinical and Conditioned Archives
title_sort comprehensive comparison of 22c3 and sp263 pd-l1 expression in non-small-cell lung cancer using routine clinical and conditioned archives
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9265108/
https://www.ncbi.nlm.nih.gov/pubmed/35804910
http://dx.doi.org/10.3390/cancers14133138
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