Expression of HGF, pMet, and pAkt is related to benefit of radiotherapy after breast-conserving surgery : a long-term follow-up of the SweBCG91-RT randomised trial
(2020) In Molecular Oncology 14(11). p.2713-2726- Abstract
Experimental studies suggest that hepatocyte growth factor (HGF) and its transmembrane tyrosine kinase receptor, Met, in part also relying on Akt kinase activity, mediate radioresistance. We investigated the importance of these biomarkers for the risk of ipsilateral breast tumour recurrence (IBTR) after adjuvant radiotherapy (RT) in primary breast cancer. HGF, phosphorylated Met (pMet) and phosphorylated Akt (pAkt) were evaluated immunohistochemically on tissue microarrays from 1004 patients in the SweBCG91-RT trial, which randomly assigned patients to breast-conserving therapy, with or without adjuvant RT. HGF was evaluated in the stroma (HGFstr); pMet in the membrane (pMetmem); HGF, pMet and pAkt in the cytoplasm... (More)
Experimental studies suggest that hepatocyte growth factor (HGF) and its transmembrane tyrosine kinase receptor, Met, in part also relying on Akt kinase activity, mediate radioresistance. We investigated the importance of these biomarkers for the risk of ipsilateral breast tumour recurrence (IBTR) after adjuvant radiotherapy (RT) in primary breast cancer. HGF, phosphorylated Met (pMet) and phosphorylated Akt (pAkt) were evaluated immunohistochemically on tissue microarrays from 1004 patients in the SweBCG91-RT trial, which randomly assigned patients to breast-conserving therapy, with or without adjuvant RT. HGF was evaluated in the stroma (HGFstr); pMet in the membrane (pMetmem); HGF, pMet and pAkt in the cytoplasm (HGFcyt, pMetcyt, pAktcyt); and pAkt in the nucleus (pAktnuc). The prognostic and treatment predictive effects were evaluated to primary endpoint IBTR as first event during the first 5 years. Patients with tumours expressing low levels of HGFcyt and pMetcyt and high levels of pAktnuc derived a larger benefit from RT [hazard ratio (HR): 0.11 (0.037–0.30), 0.066 (0.016–0.28) and 0.094 (0.028–0.31), respectively] compared to patients with high expression of HGFcyt and pMetcyt, and low pAktnuc [HR: 0.36 (0.19–0.67), 0.35 (0.20–0.64) and 0.47 (0.32–0.71), respectively; interaction analyses: P = 0.052, 0.035 and 0.013, respectively]. These differences remained in multivariable analysis when adjusting for patient age, tumour size, histological grade, St Gallen subtype and systemic treatment (interaction analysis, P-values: 0.085, 0.027, and 0.023, respectively). This study suggests that patients with immunohistochemically low HGFcyt, low pMetcyt and high pAktnuc may derive an increased benefit from RT after breast-conserving surgery concerning the risk of developing IBTR.
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- author
- Sjöström, Martin LU ; Veenstra, Cynthia ; Holmberg, Erik ; Karlsson, Per ; Killander, Fredrika LU ; Malmström, Per LU ; Niméus, Emma LU ; Fernö, Mårten LU and Stål, Olle
- organization
- publishing date
- 2020-11
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Akt, breast cancer, HGF, Met, radiotherapy, treatment prediction
- in
- Molecular Oncology
- volume
- 14
- issue
- 11
- pages
- 14 pages
- publisher
- Elsevier
- external identifiers
-
- pmid:32946618
- scopus:85091612879
- ISSN
- 1574-7891
- DOI
- 10.1002/1878-0261.12803
- language
- English
- LU publication?
- yes
- id
- 468a17c1-1078-4f42-8aaf-ad8face328b1
- date added to LUP
- 2020-10-28 13:34:13
- date last changed
- 2024-04-03 16:19:33
@article{468a17c1-1078-4f42-8aaf-ad8face328b1,
abstract = {{<p>Experimental studies suggest that hepatocyte growth factor (HGF) and its transmembrane tyrosine kinase receptor, Met, in part also relying on Akt kinase activity, mediate radioresistance. We investigated the importance of these biomarkers for the risk of ipsilateral breast tumour recurrence (IBTR) after adjuvant radiotherapy (RT) in primary breast cancer. HGF, phosphorylated Met (pMet) and phosphorylated Akt (pAkt) were evaluated immunohistochemically on tissue microarrays from 1004 patients in the SweBCG91-RT trial, which randomly assigned patients to breast-conserving therapy, with or without adjuvant RT. HGF was evaluated in the stroma (HGF<sub>str</sub>); pMet in the membrane (pMet<sub>mem</sub>); HGF, pMet and pAkt in the cytoplasm (HGF<sub>cyt</sub>, pMet<sub>cyt</sub>, pAkt<sub>cyt</sub>); and pAkt in the nucleus (pAkt<sub>nuc</sub>). The prognostic and treatment predictive effects were evaluated to primary endpoint IBTR as first event during the first 5 years. Patients with tumours expressing low levels of HGF<sub>cyt</sub> and pMet<sub>cyt</sub> and high levels of pAkt<sub>nuc</sub> derived a larger benefit from RT [hazard ratio (HR): 0.11 (0.037–0.30), 0.066 (0.016–0.28) and 0.094 (0.028–0.31), respectively] compared to patients with high expression of HGF<sub>cyt</sub> and pMet<sub>cyt</sub>, and low pAkt<sub>nuc</sub> [HR: 0.36 (0.19–0.67), 0.35 (0.20–0.64) and 0.47 (0.32–0.71), respectively; interaction analyses: P = 0.052, 0.035 and 0.013, respectively]. These differences remained in multivariable analysis when adjusting for patient age, tumour size, histological grade, St Gallen subtype and systemic treatment (interaction analysis, P-values: 0.085, 0.027, and 0.023, respectively). This study suggests that patients with immunohistochemically low HGF<sub>cyt</sub>, low pMet<sub>cyt</sub> and high pAkt<sub>nuc</sub> may derive an increased benefit from RT after breast-conserving surgery concerning the risk of developing IBTR.</p>}},
author = {{Sjöström, Martin and Veenstra, Cynthia and Holmberg, Erik and Karlsson, Per and Killander, Fredrika and Malmström, Per and Niméus, Emma and Fernö, Mårten and Stål, Olle}},
issn = {{1574-7891}},
keywords = {{Akt; breast cancer; HGF; Met; radiotherapy; treatment prediction}},
language = {{eng}},
number = {{11}},
pages = {{2713--2726}},
publisher = {{Elsevier}},
series = {{Molecular Oncology}},
title = {{Expression of HGF, pMet, and pAkt is related to benefit of radiotherapy after breast-conserving surgery : a long-term follow-up of the SweBCG91-RT randomised trial}},
url = {{http://dx.doi.org/10.1002/1878-0261.12803}},
doi = {{10.1002/1878-0261.12803}},
volume = {{14}},
year = {{2020}},
}