Research findings bring order to the genomic chaos of ovarian high grade serous carcinoma

NewsGuard 100/100 Score

New research findings based on the evolution of malignant tumors increase our understanding of the characteristics of an ovarian cancer subtype that is difficult to treat. The findings may also make it easier to effectively target therapies at the right patients.

Every year, approximately 400 women die of ovarian cancer in Finland, while the corresponding figure for Europe overall is more than 40,000. Ovarian cancer is a genetically very heterogeneous disease, which makes it exceptionally difficult to study and treat. The prognosis is particularly poor in ovarian high grade serous carcinoma (HGSC), a subtype of ovarian cancer. Less than 40% of patients with this subtype survive five years after their diagnosis.

The researchers were able to classify HGSC tumors into three groups on the basis of genomic changes. The groups differ in the intracellular signaling pathways, the ways in which the tumors grow, and response to treatment. The findings can help therapies to become more accurate and help patients with HGSC.

Prior studies have not identified generally accepted subgroups of HGSC tumours that would enable targeted treatment in the same way as, for example, in breast cancer. Our study is a step forward in identifying effective targeted therapies."

Sampsa Hautaniemi, Professor of Systems Biology, University of Helsinki

Three signaling pathways

The researchers analyzed genomics data on cancer tumors collected in the DECIDER project from 148 patients with HGSC treated and recruited in Turku University Hospital. Depending on the stage of development, they divided the tumors into three evolutionary states: evolving, maintaining and adaptive. The classification was based on the tumors' pattern of spread and their development in metastases. Depending on the group, the cancer populations grew up in combinations of either genetically different or clonal cells. These combinations either continued to evolve in metastases or remained unchanged.

The researchers identified signaling pathways characteristic of each tumor group, which make these tumors biologically distinct.

"There are targeted drugs already in clinical use for many of them. We demonstrated that a single signaling pathway, PI3K/AKT, is particularly important for certain patients. While the importance of this pathway has been known, it was not known who are most likely to respond to treatment targeted at this signaling pathway. Based on our findings, we are better able to identify the subset of patients likely to benefit from such treatment," says Postdoctoral Researcher Jaana Oikkonen from the University of Helsinki.

Tumor evolution should be investigated

The study approaches the issue from the perspective of tumor evolution, or how the tumor develops and spreads into new metastases. This approach is currently important in research on HGSC as the knowledge available is largely based on studies with small sample or patient numbers.

"The dataset we analyzed was one of the largest, if not the largest, to date in terms of HGSC tumor samples. This is yet another indication of the capacity for top-level research in Finland in spite of our small population," Hautaniemi says.

"Our findings bring order to the genomic chaos of HGSC. Now, the entire research field will advance faster, making it easier to target therapies. Of course, there is still work to be done. Further research is being carried out on, for instance, what would be the easiest way to classify patients into the three groups identified," says Postdoctoral Researcher Alexandra Lahtinen from the University of Helsinki.

The results of the joint study carried out by the University of Helsinki, Turku University Hospital, HUS Helsinki University Hospital, the University of Turku and the University of Copenhagen were published in the Cancer Cell journal in May.

Journal reference:

Lahtinen, A., et al. (2023). Evolutionary states and trajectories characterized by distinct pathways stratify patients with ovarian high grade serous carcinoma. Cancer Cell.


The opinions expressed here are the views of the writer and do not necessarily reflect the views and opinions of News Medical.
Post a new comment

While we only use edited and approved content for Azthena answers, it may on occasions provide incorrect responses. Please confirm any data provided with the related suppliers or authors. We do not provide medical advice, if you search for medical information you must always consult a medical professional before acting on any information provided.

Your questions, but not your email details will be shared with OpenAI and retained for 30 days in accordance with their privacy principles.

Please do not ask questions that use sensitive or confidential information.

Read the full Terms & Conditions.

You might also like...
Lung cancer screening yields early diagnoses and increased cure rates in veterans