Cancer Research and Treatment

Original Articles

Clinical Impact of TP53 Mutations in Patients with Head and Neck Cancer Who Were Treated with Targeted Therapies or Immunotherapy: Eun Joo Kang, Shinwon Hwang, Yun-Gyoo Lee, Jong-Kwon Choi, Seong Hoon Shin, Yoon Hee Choi, Keun-Wook Lee, Hyun Woo Lee, Min Kyoung Kim, Seung Taek Lim, Hwan Jung Yun, Sang-Gon Park, Sangwoo Kim, Sung-Bae Kim, Hye Ryun Kim; Received August 28, 2024 Accepted December 21, 2024 Published online December 23, 2024; DOI: https://doi.org/10.4143/crt.2024.836 [Accepted]

Abstract PDF: Purpose
TP53 mutations are common in head and neck squamous cell carcinoma (HNSCC). We evaluated their clinical impact in patients treated with targeted agents or immunotherapy in the KCSG HN15-16 TRIUMPH trial.
Materials and Methods
We analyzed clinical characteristics and outcomes of patients with TP53 mutations in the TRIUMPH trial, a multicenter, biomarker-driven umbrella trial in Korea. Patients were assigned to treatment groups based on genomic profiles: Group 1, alpelisib; Group 2, poziotinib; Group 3, nintedanib; and Group 4, abemaciclib. If there was no identifiable target, the patients were allocated to Group 5 (durvalumab ± tremelimumab).
Results
TP53 mutations were detected in 116/179 patients (64.8%), more frequently in HPV-negative and non-oropharyngeal cancers. Patients with TP53 mutations exhibited shorter progression-free survival (PFS) than TP53 wild-type in all the patients (1.7 vs. 3.8 months, p=0.002) and in those who received targeted treatments (2.5 vs. 7.3 months, p=0.009). Furthermore, TP53 mutations were strongly associated with poor overall survival than TP53 wild-type in all the patients (11.1 vs. 28.8 months, p=0.005) and in Group 5 (8.1 vs. 33.0 months, p=0.001).
Conclusion
TP53 mutations were associated with aggressive clinical characteristics and poor survival, particularly in HNSCC patients treated with immunotherapy.

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Association between Mutation and Expression of TP53 as a Potential Prognostic Marker of Triple-Negative Breast Cancer: Ji-Yeon Kim, Kyunghee Park, Hae Hyun Jung, Eunjin Lee, Eun Yoon Cho, Kwang Hee Lee, Soo Youn Bae, Se Kyung Lee, Seok Won Kim, Jeong Eon Lee, Seok Jin Nam, Jin Seok Ahn, Young-Hyuck Im, Yeon Hee Park; Cancer Res Treat. 2016;48(4):1338-1350. Published online February 18, 2016; DOI: https://doi.org/10.4143/crt.2015.430

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Purpose
TP53, the most frequently mutated gene in breast cancer, is more frequently altered in HER2-enriched and basal-like breast cancer. However, no studies have clarified the role of TP53 status as a prognostic and predictive marker of triple-negative breast cancer (TNBC).
Materials and Methods
We performed p53 immunohistochemistry (IHC), nCounter mRNA expression assay, and DNA sequencing to determine the relationship between TP53 alteration and clinical outcomes of TNBC patients.
Results
Seventy-seven of 174 TNBC patients were found to harbor a TP53 mutation. Patients with missense mutations showed high protein expression in contrast to patients with deletion mutations (positivity of IHC: wild type vs. missense vs. deletion mutation, 53.6% vs. 89.8% vs. 25.0%, respectively; p < 0.001). TP53 mRNA expression was influenced by mutation status (mRNA expression [median]: wild type vs. missense vs. deletion mutation, 207.36± 132.73 vs. 339.61±143.21 vs. 99.53±99.57,respectively; p < 0.001). According to survival analysis, neither class of mutation nor protein or mRNA expression status had any impact on patient prognosis. In subgroup analysis, low mRNA expression was associated with poor prognosis in patientswith a TP53 missense mutation (5-year distantrecurrence-free survival [5Y DRFS]: low vs. high, 50.0% vs. 87.8%; p=0.009), while high mRNA expression with a TP53 deletion mutation indicated poor prognosis (5Y DRFS: low vs. high, 91.7% vs. 75.0%; p=0.316).
Conclusion
Association between TP53 mutation and expression indicates a potential prognostic marker of TNBC; hence both DNA sequencing and mRNA expression analysis may be required to predict the prognosis of TNBC patients.

Citations

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The Blocking of c-Met Signaling Induces Apoptosis through the Increase of p53 Protein in Lung Cancer: Hae-Yun Jung, Hyun-Jung Joo, Jong Kuk Park, Yeul Hong Kim; Cancer Res Treat. 2012;44(4):251-261. Published online December 31, 2012; DOI: https://doi.org/10.4143/crt.2012.44.4.251

Abstract PDF PubReader ePub

PURPOSE
c-Met is an attractive potential target for novel therapeutic inhibition of human cancer, and c-Met tyrosine kinase inhibitors (TKIs) are effective growth inhibitors of various malignancies. However, their mechanisms in anticancer effects are not clear. In the present study, we investigated the possibility that blocking c-Met signaling induces p53-mediated growth inhibition in lung cancer.
MATERIALS AND METHODS
The growth inhibitory effects of c-Met TKI (SU11274) on lung cancer cells and a xenograft model were assessed using the MTT assay, flow cytometry, and terminal deoxyribonucleotide transferase-mediated nick-end labeling staining. The role of p53 protein in the sensitivity of c-Met TKI (SU11274) was examined by Western blot analysis and immunohistochemistry.
RESULTS
SU11274 significantly induced apoptosis in A549 cells with wild-type p53, compared with that in Calu-1 cells with null-type p53. SU11274 increased p53 protein by enhancing the stability of p53 protein. Increased p53 protein by SU11274 induced up-regulation of Bax and PUMA expression and down-regulation of Bcl-2 expression, subsequently activating caspase 3. In p53 knock-out and knock-in systems, we confirmed that SU11274 caused apoptosis through the p53-mediated apoptotic pathway. Likewise, in the A549 xenograft model, SU11274 effectively shrank tumor volume and induced apoptosis via increased p53 protein expression. Blocking c-Met signaling increased the level of p53 protein.
CONCLUSION
Our finding suggested that p53 plays an important role in SU11274-induced apoptosis, and p53 status seems to be related to the sensitivity to SU11274 in lung cancer.

Citations

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Fragment-based design and synthesis of coumarin-based thiazoles as dual c-MET/STAT-3 inhibitors for potential antitumor agents
Bassem H. Naguib, Heba A. Elsebaie, Mohamed S. Nafie, Samy Mohamady, Nader R. Albujuq, Aya Samir Ayed, Dina Nada, Ahmed F. Khalil, Salma M. Hefny, Haytham O. Tawfik, Moataz A. Shaldam
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Artonin F Induces the Ubiquitin-Proteasomal Degradation of c-Met and Decreases Akt-mTOR Signaling
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p53 Prevents Immature Escaping from Cell Cycle G2 Checkpoint Arrest through Inhibiting cdk2-dependent NF-Y Phosphorylation: Un-Jung Yun, Heui-Dong Park, Deug Y Shin; Cancer Res Treat. 2006;38(4):224-228. Published online December 31, 2006; DOI: https://doi.org/10.4143/crt.2006.38.4.224

Abstract PDF PubReader ePub

Purpose

Recent studies have suggested that p53 regulates the G2 checkpoint in the cell cycle and this function is required for the maintenance of genomic integrity. In this study, we addressed a role of p53 in escaping from cell cycle G2 arrest following DNA damage.

Materials and Methods

Cell cycle checkpoint arrest in the human colon cancer cell line HCT116 and its derivatives carry p53 or p21 deletions, were examined by FACS analysis, immunoprecipitation, Western blot and IP-kinase assay.

Results

While the cells with functional p53 were arrested at both the G1 and G2 checkpoints, the p53-deficient cells failed to arrest at G1, but they were arrested at G2. However, the p53-deficient cells failed to sustain G2 checkpoint arrest and they entered mitosis earlier than did the p53-positive cells and so this resulted in extensive cell death. Cdc2 kinase becomes reactivated in p53-deficient cells in association with entry into mitosis, but not in the p53-positive cells. Upon DNA damage, the p21-deficient cells, like the p53-negative cells, not only failed to repress cdk2-dependent NF-Y phosphorylation, but they also failed to repress the expression of such cell cycle G2-regulatory genes as cdc2, cyclin B, RNR-R2 and cdc25C, which have all been previously reported as targets of NF-Y transcription factor.

Conclusions

p53 is essential to prevent immature escaping from cell cycle G2 checkpoint arrest through p21-mediated cdk2 inactivation, and this leads to inhibition of cdk2-dependent NF-Y phosphorylation and NF-Y dependent transcription of the cell cycle G2-rgulatory genes, including cdc2 and cyclin B.

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