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Molecular Pathology and Treatment of Ovarian Cancer

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Molecular Oncology".

Deadline for manuscript submissions: closed (28 February 2025) | Viewed by 1917

Special Issue Editor

Special Issue Information

Dear Colleagues,

Ovarian cancer is a sneaky disease. The most common form, “high-grade serous ovarian carcinoma” (HGSOC), accounts for almost 70% of all diagnoses. Unfortunately, it represents the most aggressive and lethal form, often resistant to chemotherapy drugs, mainly because it is diagnosed at an advanced stage. In fact, ovarian cancer often presents with very generic symptoms that delay diagnosis. Even when the symptoms act as an alarm bell, ovarian cancer is already at a relatively advanced stage. It is estimated that less than 20% of ovarian cancers are diagnosed at an early stage, but when this happens, about 90% reach five-year survival from diagnosis. As far as we know, standard gynecological check-ups are not useful for the early identification of ovarian cancer, as are transvaginal ultrasounds, which also identify already advanced tumors, or even the measurement of the CA-125 marker, an imperfect test that gives many false positives and is therefore not useful as a screening test to be proposed to all women, regardless of their individual risk level. Moreover, the search for blood biological markers for early diagnosis has not yet yielded appreciable results, and the available tests are not sufficiently reliable. Furthermore, ovarian cancers are characterized by a great variability of genetic mutations (even affecting the well-known BRCA gene), which makes it difficult to identify the most effective targets for a targeted therapy. Surgery still plays a major role in the treatment of ovarian cancer, and in the early stages, it is curative in about 70% of cases. However, even in early-stage cancer, chemotherapy is prescribed after surgery, given the 25–30% risk of disease recurrence. From a pharmacological point of view, platinum-based chemotherapy, taxol, and derivatives are still the mainstay of treatment today. However, important innovations have emerged from research. Several innovative therapies have recently been developed and tested, including new combinations of chemotherapeutics, new times and methods of administration, and not least the immunotherapy approach. The difficulty in identifying effective early detection and screening tools and innovative therapeutic approaches to reduce ovarian cancer-related mortality suggests the topic of this Special Issue. Thus, studies and research that are actually focusing on: (i) the identification of new biomarkers that can be used in a possible screening; (ii) early diagnosis techniques; and (iii) new therapeutic approaches are welcome.

Dr. Laura Paleari
Guest Editor

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Keywords

  • ovarian cancer
  • screening
  • early diagnosis
  • predictive/prognostic markers
  • innovative therapy
  • molecular pathology
  • precision medicine

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Published Papers (2 papers)

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Research

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16 pages, 5043 KiB  
Article
Proteasome Inhibitor MG-132 and PKC-ι-Specific Inhibitor ICA-1S Degrade Mutant p53 and Induce Apoptosis in Ovarian Cancer Cell Lines
by Mahfuza Marzan, Nuzhat Nowshin Oishee, Abigail Oluwafisayo Olatunji, Abiral Hasib Shourav, Radwan Ebna Noor, Aaron Joshua Astalos, James W. Leahy and Mildred Acevedo-Duncan
Int. J. Mol. Sci. 2025, 26(7), 3035; https://doi.org/10.3390/ijms26073035 - 26 Mar 2025
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Abstract
Ovarian cancer is the most lethal gynecological cancer, with a 5-year survival rate of approximately 50%. Mutation in the p53 gene and overexpression of the atypical protein kinase C iota (PKC-ι) are two phenomena widely manifested in ovarian cancer. This study investigated the [...] Read more.
Ovarian cancer is the most lethal gynecological cancer, with a 5-year survival rate of approximately 50%. Mutation in the p53 gene and overexpression of the atypical protein kinase C iota (PKC-ι) are two phenomena widely manifested in ovarian cancer. This study investigated the role of PKC-ι-specific inhibitor ICA-1S and proteasome inhibitor MG-132 in ovarian cancer cell lines. To discern the result, cell proliferation assays, cytotoxicity assays, Western blotting, immunofluorescence, flow cytometry, small interfering RNA, and co-immunoprecipitation techniques were applied. ICA-1S and MG-132 were found to inhibit the proliferation of ovarian cancer cell lines significantly. ICA-1S reduced the level of oncogenic PKC-ι as expected. In addition, ICA-1S and MG-132 both were able to decrease the level of mutated p53 in the ES-2 cell line through separate pathways. On the contrary, MG-132 increased the level of wild-type p53 in the HEY-T30 cell line by inhibiting proteasomal degradation. MG-132 also induced apoptosis and autophagy in the ovarian cancer cell lines. We concluded that ICA-1S alone or in combination with MG-132 could be a potential treatment for mutated p53-containing and PKC-ι-overexpressing ovarian cancers. Full article
(This article belongs to the Special Issue Molecular Pathology and Treatment of Ovarian Cancer)
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Review

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37 pages, 2353 KiB  
Review
Precision Medicine in High-Grade Serous Ovarian Cancer: Targeted Therapies and the Challenge of Chemoresistance
by Sara Polajžer and Katarina Černe
Int. J. Mol. Sci. 2025, 26(6), 2545; https://doi.org/10.3390/ijms26062545 - 12 Mar 2025
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Abstract
The poor prognosis for high-grade serous ovarian cancer (HGSOC), the dominant subtype of ovarian cancer, reflects its aggressive nature, late diagnosis, and the highest mortality rate among all gynaecologic cancers. Apart from late diagnosis, the main reason for the poor prognosis and its [...] Read more.
The poor prognosis for high-grade serous ovarian cancer (HGSOC), the dominant subtype of ovarian cancer, reflects its aggressive nature, late diagnosis, and the highest mortality rate among all gynaecologic cancers. Apart from late diagnosis, the main reason for the poor prognosis and its unsuccessful treatment is primarily the emergence of chemoresistance to carboplatin. Although there is a good response to primary treatment, the disease recurs in 80% of cases, at which point it is largely resistant to carboplatin. The introduction of novel targeted therapies in the second decade of the 21st century has begun to transform the treatment of HGSOC, although their impact on overall survival remains unsatisfactory. Targeting the specific pathways known to be abnormally activated in HGSOC is especially difficult due to the molecular diversity of its subtypes. Moreover, a range of molecular changes are associated with acquired chemoresistance, e.g., reversion of BRCA1 and BRCA2 germline alleles. In this review, we examine the advantages and disadvantages of approved targeted therapies, including bevacizumab, PARP inhibitors (PARPis), and treatments targeting cells with neurotrophic tyrosine receptor kinase (NTRK), B-rapidly accelerated fibrosarcoma (BRAF), and rearranged during transfection (RET) gene alterations, as well as antibody–drug conjugates. Additionally, we explore promising new targets under investigation in ongoing clinical trials, such as immune checkpoint inhibitors, anti-angiogenic agents, phosphatidylinositol-3-kinase (PI3K) inhibitors, Wee1 kinase inhibitors, and ataxia telangiectasia and Rad3-related protein (ATR) inhibitors for platinum-resistant disease. Despite the development of new targeted therapies, carboplatin remains the fundamental medicine in HGSOC therapy. The correct choice of treatment strategy for better survival of patients with advanced HGSOC should therefore include a prediction of patients’ risks of developing chemoresistance to platinum-based chemotherapy. Moreover, effective targeted therapy requires the selection of patients who are likely to derive clinical benefit while minimizing potential adverse effects, underscoring the essence of precision medicine. Full article
(This article belongs to the Special Issue Molecular Pathology and Treatment of Ovarian Cancer)
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