NET G3 vs NEC: p53 and Rb1 Immunolabeling in High-grade Gastrointestinal Neuroendocrine Neoplasms - Is It Enough for the Differential Diagnosis?

High-grade gastrointestinal neuroendocrine neoplasms (GI-NENs) are divided into well-differentiated G3 neuroendocrine tumors (NETs G3) and neuroendocrine carcinomas (NECs), having identical cut-offs of proliferation, but different biomolecular origins. This translates in distinct treatment choices....

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Veröffentlicht in:Journal of gastrointestinal and liver diseases : JGLD 2023-06, Vol.32 (2), p.162-169
Hauptverfasser: Dinu, Alexandra, Aschie, Mariana, Cozaru, Georgeta Camelia, Mitroi, Anca Florentina, Grasa, Catalin Nicolae, Iordache, Ionut Eduard, Deacu, Mariana, Orasanu, Cristian Ionut, Nicolau, Antonela-Anca, Baltatescu, Gabriela Izabela
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container_title Journal of gastrointestinal and liver diseases : JGLD
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creator Dinu, Alexandra
Aschie, Mariana
Cozaru, Georgeta Camelia
Mitroi, Anca Florentina
Grasa, Catalin Nicolae
Iordache, Ionut Eduard
Deacu, Mariana
Orasanu, Cristian Ionut
Nicolau, Antonela-Anca
Baltatescu, Gabriela Izabela
description High-grade gastrointestinal neuroendocrine neoplasms (GI-NENs) are divided into well-differentiated G3 neuroendocrine tumors (NETs G3) and neuroendocrine carcinomas (NECs), having identical cut-offs of proliferation, but different biomolecular origins. This translates in distinct treatment choices. Our aim was to establish if p53/Rb1 immunohistochemical status in GI-NENs with Ki67 index >20% can predict the histopathological diagnosis. p53/Rb1 immunolabelling was performed on 42 cases of high-grade GI-NENs, diagnosed as NET G3, NEC and mixed neuroendocrine-non-neuroendocrine neoplasms (MiNEN) with NEC component. Immunolabeled slides were digitally scanned, with automatic quantification of p53 and Rb1, blind to the diagnosis. The p53 positive percentage was stratified; two cut-offs were selected, naming the intervals as N (null, 20%). The Rb1 expression loss in >90% of neoplastic cells was considered mutational. NETs G3 mainly showed the T status (14/16, 87.5%), followed by N (1/16, 6.25%) and C (1/16, 6.25%); NECs and NEC components in MiNENs predominantly expressed the C status (19/26, 73.08%), followed by N (5/26, 19.23%) and T (2/26, 7.69%) (p
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This translates in distinct treatment choices. Our aim was to establish if p53/Rb1 immunohistochemical status in GI-NENs with Ki67 index &gt;20% can predict the histopathological diagnosis. p53/Rb1 immunolabelling was performed on 42 cases of high-grade GI-NENs, diagnosed as NET G3, NEC and mixed neuroendocrine-non-neuroendocrine neoplasms (MiNEN) with NEC component. Immunolabeled slides were digitally scanned, with automatic quantification of p53 and Rb1, blind to the diagnosis. The p53 positive percentage was stratified; two cut-offs were selected, naming the intervals as N (null, &lt;1%), T (tumor, 1%-20%) and C (carcinoma, &gt;20%). The Rb1 expression loss in &gt;90% of neoplastic cells was considered mutational. NETs G3 mainly showed the T status (14/16, 87.5%), followed by N (1/16, 6.25%) and C (1/16, 6.25%); NECs and NEC components in MiNENs predominantly expressed the C status (19/26, 73.08%), followed by N (5/26, 19.23%) and T (2/26, 7.69%) (p&lt;0.001, χ 2 =27.017). NET G3s showed positive expression for Rb1; 73.08% of NECs expressed negative Rb1 (p&lt;0.001, χ 2 =21.351). NECs and NEC components in MiNENs showed Rb1 mutational status in 13 C cases (13/19, 68.42%), 4 N cases (4/5, 80%) and in both the T cases (p=0.002, χ 2 =11.187). Our results highlight the correlations between the p53/Rb1 immunostainings and the histopathological diagnosis of high-grade GI-NENs. NECs and NEC components in MiNENs showed a p53 mutational status (0% or 21-100%) and predominantly negative Rb1 expression. NETs G3 showed a p53 wild-type status (1-20%) and retained Rb1 expression. 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This translates in distinct treatment choices. Our aim was to establish if p53/Rb1 immunohistochemical status in GI-NENs with Ki67 index &gt;20% can predict the histopathological diagnosis. p53/Rb1 immunolabelling was performed on 42 cases of high-grade GI-NENs, diagnosed as NET G3, NEC and mixed neuroendocrine-non-neuroendocrine neoplasms (MiNEN) with NEC component. Immunolabeled slides were digitally scanned, with automatic quantification of p53 and Rb1, blind to the diagnosis. The p53 positive percentage was stratified; two cut-offs were selected, naming the intervals as N (null, &lt;1%), T (tumor, 1%-20%) and C (carcinoma, &gt;20%). The Rb1 expression loss in &gt;90% of neoplastic cells was considered mutational. NETs G3 mainly showed the T status (14/16, 87.5%), followed by N (1/16, 6.25%) and C (1/16, 6.25%); NECs and NEC components in MiNENs predominantly expressed the C status (19/26, 73.08%), followed by N (5/26, 19.23%) and T (2/26, 7.69%) (p&lt;0.001, χ 2 =27.017). NET G3s showed positive expression for Rb1; 73.08% of NECs expressed negative Rb1 (p&lt;0.001, χ 2 =21.351). NECs and NEC components in MiNENs showed Rb1 mutational status in 13 C cases (13/19, 68.42%), 4 N cases (4/5, 80%) and in both the T cases (p=0.002, χ 2 =11.187). Our results highlight the correlations between the p53/Rb1 immunostainings and the histopathological diagnosis of high-grade GI-NENs. NECs and NEC components in MiNENs showed a p53 mutational status (0% or 21-100%) and predominantly negative Rb1 expression. NETs G3 showed a p53 wild-type status (1-20%) and retained Rb1 expression. 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This translates in distinct treatment choices. Our aim was to establish if p53/Rb1 immunohistochemical status in GI-NENs with Ki67 index &gt;20% can predict the histopathological diagnosis. p53/Rb1 immunolabelling was performed on 42 cases of high-grade GI-NENs, diagnosed as NET G3, NEC and mixed neuroendocrine-non-neuroendocrine neoplasms (MiNEN) with NEC component. Immunolabeled slides were digitally scanned, with automatic quantification of p53 and Rb1, blind to the diagnosis. The p53 positive percentage was stratified; two cut-offs were selected, naming the intervals as N (null, &lt;1%), T (tumor, 1%-20%) and C (carcinoma, &gt;20%). The Rb1 expression loss in &gt;90% of neoplastic cells was considered mutational. NETs G3 mainly showed the T status (14/16, 87.5%), followed by N (1/16, 6.25%) and C (1/16, 6.25%); NECs and NEC components in MiNENs predominantly expressed the C status (19/26, 73.08%), followed by N (5/26, 19.23%) and T (2/26, 7.69%) (p&lt;0.001, χ 2 =27.017). NET G3s showed positive expression for Rb1; 73.08% of NECs expressed negative Rb1 (p&lt;0.001, χ 2 =21.351). NECs and NEC components in MiNENs showed Rb1 mutational status in 13 C cases (13/19, 68.42%), 4 N cases (4/5, 80%) and in both the T cases (p=0.002, χ 2 =11.187). Our results highlight the correlations between the p53/Rb1 immunostainings and the histopathological diagnosis of high-grade GI-NENs. NECs and NEC components in MiNENs showed a p53 mutational status (0% or 21-100%) and predominantly negative Rb1 expression. NETs G3 showed a p53 wild-type status (1-20%) and retained Rb1 expression. 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subjects Carcinoma, Neuroendocrine - diagnosis
Carcinoma, Neuroendocrine - genetics
Carcinoma, Neuroendocrine - pathology
Diagnosis, Differential
Gastrointestinal Neoplasms - diagnosis
Gastrointestinal Neoplasms - genetics
Humans
Neuroendocrine Tumors - diagnosis
Neuroendocrine Tumors - genetics
Neuroendocrine Tumors - metabolism
Pancreatic Neoplasms - pathology
Tumor Suppressor Protein p53 - genetics
title NET G3 vs NEC: p53 and Rb1 Immunolabeling in High-grade Gastrointestinal Neuroendocrine Neoplasms - Is It Enough for the Differential Diagnosis?
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