Aggressive luminal breast cancer: Are cis-spliced fusion proteins pathological?

“Our findings may provide a useful therapeutic approach for treating breast cancer patients who may suffer from early relapse and intrinsic resistance.” Credit: 2023 Liu and Wang. “Our findings may provide a useful therapeutic approach for treating breast cancer patients who may suffer from early relapse and intrinsic resistance.” BUFFALO, NY- August 16, 2023 – […]

Aug 21, 2023 - 20:00

Aggressive luminal breast cancer: Are cis-spliced fusion proteins pathological?

“Our findings may provide a useful therapeutic approach for treating breast cancer patients who may suffer from early relapse and intrinsic resistance.”

Oncotarget

Credit: 2023 Liu and Wang.

“Our findings may provide a useful therapeutic approach for treating breast cancer patients who may suffer from early relapse and intrinsic resistance.”

BUFFALO, NY- August 16, 2023 – A new editorial paper was published in Oncotarget’s Volume 14 on June 12, 2023, entitled, “Are cis-spliced fusion proteins pathological in more aggressive luminal breast cancer?”

A vast majority of breast cancers (~70%) are estrogen receptor-alpha positive (ER+), for which endocrine therapy is the common treatment. However, recurrence often occurs leading to tumor progression, metastasis and eventually patient death, and the underlying molecular mechanisms remain poorly understood. In this new editorial, researchers Chia-Chia Liu and Xiao-Song Wang from the University of Pittsburgh discuss their recent study regarding recurrent gene fusions — hallmarks of some cancers that resulted either from chromosomal rearrangements or from cis- or trans-splicing.

“Importantly, selected oncogenic fusions have been matched with effective targeted therapy in several solid tumors. For instance, EML4-ALK, one of the most important oncogenic driver genes of non-small cell lung cancer (NSCLC) uncovered in recent years.”

In addition to gene fusions resulting from genomic rearrangements, a read-through SLC45A3-ELK4 fusion transcript has been identified in prostate cancer which is associated with disease progression and metastasis. Although the whole genome and RNA sequencing provide an effective way to detect fusion genes, the downstream identification and validation of fusion genes or their products in solid tumors remains a major challenge. Through analysis of RNA-seq data from TCGA, the authors of this editorial and their co-authors recently identified a neoplastic fusion transcript RAD51AP1-DYRK4 in luminal B breast cancer (~17.5%) showing higher ki67 expression which is an indication of aggressive clinical characteristics.

“In this study, we examined the utility of MEK inhibitor trametinib (Mekinist) currently used for treating melanoma with BRAF mutations, in blocking the MEK-ERK signaling driven by RAD51AP1-DYRK4 fusion. Interestingly […] RAD51AP1-DYRK4 may endow sensitivity to MEK inhibition in luminal B breast cancer [13]. To our knowledge, this is one of the few non-traditional fusions generated by read-through events in the absence of DNA rearrangement that play an important role in tumorigenesis.”

Read the full editorial: DOI: https://doi.org/10.18632/oncotarget.28438

Correspondence to: Xiao-Song Wang

Email: xiaosongw@pitt.edu

Keywords: luminal B breast cancer, RAD51AP1-DYRK4, MEK inhibitor, chimerical transcript

About Oncotarget: Oncotarget (a primarily oncology-focused, peer-reviewed, open access journal) aims to maximize research impact through insightful peer-review; eliminate borders between specialties by linking different fields of oncology, cancer research and biomedical sciences; and foster application of basic and clinical science.

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