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Research
Zhiyong Liang
Peking Union Medical College Hospital
Corresponding Author
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Objective
HER2 immunohistochemistry (IHC) 2+ breast cancer patients need to determine the final HER2 status by fluorescence in situ hybridization (FISH) for selection of suitable treatment options. Although the HER2-positive cases can benefit from the anti-HER2 targeted therapy, it only made a small proportion of this group, so finding more targeted therapy methods is necessary. NTRK, RET, ROS1 and RET gene fusions have been fully investigated in non-small cell lung carcinoma and are subject to targeted therapy in clinical practice and trials. However, there are only few reports investigating these four fusion genes in breast cancer. Our study is designed to evaluate the four fusion genes in HER2 IHC 2+ breast cancer patients to find an alternative treatment option.
Methods
One hundred and seventy-seven tissue samples were included. IHC was employed to assess ALK and NTRK protein levels. FISH probes specific for HER2, ALK, NTRK1, NTRK2, NTRK3, ROS1 and RET were used.
Results
The HER2-positivity rate of all HER2 IHC 2+ cases were 5.7%. The total fusion rate of the four oncogenes was 3.95% in HER2 IHC 2+ breast cancer patients. The fusion-positive patients were prone to be ER/PR/HER2 IHC triple negative (P=0.01) and were associated with poorly differentiated tumor (P=0.005). The NTRK, RET, ROS1, and ALK fusion rate was 0.56%, 1.13%, 1.13%, 1.13%, respectively.
Conclusions
NRTK, RET, ROS1, and ALK fusion rearrangements were detected in triple-negative breast carcinoma patients which can provide patients with alternate treatment opportunities in clinical practice.
Keywords
Breast carcinoma, HER2, NTRK, ROS1, ALK, RET
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A new preprint design is coming!
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This is a preprint, a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Research
Zhiyong Liang
Peking Union Medical College Hospital
Corresponding Author
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
History
CURRENT STATUS: Posted
Version 1
Posted 21 Jan, 2021
No community comments so far
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
Subject Areas
Pathology
License:
This work is licensed under a CC BY 4.0 License. Read Full License
Objective
HER2 immunohistochemistry (IHC) 2+ breast cancer patients need to determine the final HER2 status by fluorescence in situ hybridization (FISH) for selection of suitable treatment options. Although the HER2-positive cases can benefit from the anti-HER2 targeted therapy, it only made a small proportion of this group, so finding more targeted therapy methods is necessary. NTRK, RET, ROS1 and RET gene fusions have been fully investigated in non-small cell lung carcinoma and are subject to targeted therapy in clinical practice and trials. However, there are only few reports investigating these four fusion genes in breast cancer. Our study is designed to evaluate the four fusion genes in HER2 IHC 2+ breast cancer patients to find an alternative treatment option.
Methods
One hundred and seventy-seven tissue samples were included. IHC was employed to assess ALK and NTRK protein levels. FISH probes specific for HER2, ALK, NTRK1, NTRK2, NTRK3, ROS1 and RET were used.
Results
The HER2-positivity rate of all HER2 IHC 2+ cases were 5.7%. The total fusion rate of the four oncogenes was 3.95% in HER2 IHC 2+ breast cancer patients. The fusion-positive patients were prone to be ER/PR/HER2 IHC triple negative (P=0.01) and were associated with poorly differentiated tumor (P=0.005). The NTRK, RET, ROS1, and ALK fusion rate was 0.56%, 1.13%, 1.13%, 1.13%, respectively.
Conclusions
NRTK, RET, ROS1, and ALK fusion rearrangements were detected in triple-negative breast carcinoma patients which can provide patients with alternate treatment opportunities in clinical practice.
Figure 1
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