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Higher PD-L1 Immunohistochemical Detection Signal in Frozen Compared to Matched Paraffin-Embedded Formalin-Fixed Tissues

Purpose: Response to anti-PD-L1/PD-1 immunotherapy correlates with PD-L1 expression in breast cancer. However, the prevalence of PD-L1 positive breast cancer is variable, which could be due to differences in the population/cohort of patients tested or the preservation/detection technology used. To i...

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Autores principales: Ghebeh, Hazem, Mansour, Fatmah A., Colak, Dilek, Alfuraydi, Akram A., Al-Thubiti, Amal A., Monies, Dorota, Al-Alwan, Monther, Al-Tweigeri, Taher, Tulbah, Asma
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8293136/
https://www.ncbi.nlm.nih.gov/pubmed/34206205
http://dx.doi.org/10.3390/antib10030024
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author Ghebeh, Hazem
Mansour, Fatmah A.
Colak, Dilek
Alfuraydi, Akram A.
Al-Thubiti, Amal A.
Monies, Dorota
Al-Alwan, Monther
Al-Tweigeri, Taher
Tulbah, Asma
author_facet Ghebeh, Hazem
Mansour, Fatmah A.
Colak, Dilek
Alfuraydi, Akram A.
Al-Thubiti, Amal A.
Monies, Dorota
Al-Alwan, Monther
Al-Tweigeri, Taher
Tulbah, Asma
author_sort Ghebeh, Hazem
collection PubMed
description Purpose: Response to anti-PD-L1/PD-1 immunotherapy correlates with PD-L1 expression in breast cancer. However, the prevalence of PD-L1 positive breast cancer is variable, which could be due to differences in the population/cohort of patients tested or the preservation/detection technology used. To investigate this variability, we examined the effect of two tissue preservation methods on PD-L1 immunohistochemical detection in breast cancer. Methods: We compared PD-L1 expression in patient-matched frozen (FR) and formalin-fixed paraffin-embedded (FFPE) tissues of breast cancer patients. PD-L1 expression was assessed using tumor proportion score (TPS, simply PD-L1 score), and case positivity was determined with PD-L1 score ≥5. Results: In FFPE tissues, PD-L1 was positive in 7–10% of tested patients, depending on the antibody used. In patient-matched FR tissues, the same antibodies showed positive PD-L1 expression in 20–30% of cases. The impact of the antibody tested on the rate of PD-L1 positivity (% of PDL1 positive cases) was minor, as evident in the near perfect concordance between PD-L1 score obtained using the different antibodies whether tested in FR or FFPE tissues. However, there was a systematic drop by an average of 13–20% in the PD-L1 score obtained in FFPE tissues compared to their patient-matched FR tissues. Conclusions: In the tested patient-matched cohort, there was consistently a higher PD-L1 score in FR than FFPE tissues, regardless of the antibody used, demonstrating a significant effect on PD-L1 detection due to the preservation method. These findings should inspire further work to improve the sensitivity of PD-L1 detection and possibly search for more sensitive antibodies in FFPE tissues.
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spelling pubmed-82931362021-07-22 Higher PD-L1 Immunohistochemical Detection Signal in Frozen Compared to Matched Paraffin-Embedded Formalin-Fixed Tissues Ghebeh, Hazem Mansour, Fatmah A. Colak, Dilek Alfuraydi, Akram A. Al-Thubiti, Amal A. Monies, Dorota Al-Alwan, Monther Al-Tweigeri, Taher Tulbah, Asma Antibodies (Basel) Article Purpose: Response to anti-PD-L1/PD-1 immunotherapy correlates with PD-L1 expression in breast cancer. However, the prevalence of PD-L1 positive breast cancer is variable, which could be due to differences in the population/cohort of patients tested or the preservation/detection technology used. To investigate this variability, we examined the effect of two tissue preservation methods on PD-L1 immunohistochemical detection in breast cancer. Methods: We compared PD-L1 expression in patient-matched frozen (FR) and formalin-fixed paraffin-embedded (FFPE) tissues of breast cancer patients. PD-L1 expression was assessed using tumor proportion score (TPS, simply PD-L1 score), and case positivity was determined with PD-L1 score ≥5. Results: In FFPE tissues, PD-L1 was positive in 7–10% of tested patients, depending on the antibody used. In patient-matched FR tissues, the same antibodies showed positive PD-L1 expression in 20–30% of cases. The impact of the antibody tested on the rate of PD-L1 positivity (% of PDL1 positive cases) was minor, as evident in the near perfect concordance between PD-L1 score obtained using the different antibodies whether tested in FR or FFPE tissues. However, there was a systematic drop by an average of 13–20% in the PD-L1 score obtained in FFPE tissues compared to their patient-matched FR tissues. Conclusions: In the tested patient-matched cohort, there was consistently a higher PD-L1 score in FR than FFPE tissues, regardless of the antibody used, demonstrating a significant effect on PD-L1 detection due to the preservation method. These findings should inspire further work to improve the sensitivity of PD-L1 detection and possibly search for more sensitive antibodies in FFPE tissues. MDPI 2021-06-22 /pmc/articles/PMC8293136/ /pubmed/34206205 http://dx.doi.org/10.3390/antib10030024 Text en © 2021 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
Ghebeh, Hazem
Mansour, Fatmah A.
Colak, Dilek
Alfuraydi, Akram A.
Al-Thubiti, Amal A.
Monies, Dorota
Al-Alwan, Monther
Al-Tweigeri, Taher
Tulbah, Asma
Higher PD-L1 Immunohistochemical Detection Signal in Frozen Compared to Matched Paraffin-Embedded Formalin-Fixed Tissues
title Higher PD-L1 Immunohistochemical Detection Signal in Frozen Compared to Matched Paraffin-Embedded Formalin-Fixed Tissues
title_full Higher PD-L1 Immunohistochemical Detection Signal in Frozen Compared to Matched Paraffin-Embedded Formalin-Fixed Tissues
title_fullStr Higher PD-L1 Immunohistochemical Detection Signal in Frozen Compared to Matched Paraffin-Embedded Formalin-Fixed Tissues
title_full_unstemmed Higher PD-L1 Immunohistochemical Detection Signal in Frozen Compared to Matched Paraffin-Embedded Formalin-Fixed Tissues
title_short Higher PD-L1 Immunohistochemical Detection Signal in Frozen Compared to Matched Paraffin-Embedded Formalin-Fixed Tissues
title_sort higher pd-l1 immunohistochemical detection signal in frozen compared to matched paraffin-embedded formalin-fixed tissues
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8293136/
https://www.ncbi.nlm.nih.gov/pubmed/34206205
http://dx.doi.org/10.3390/antib10030024
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