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Manirakiza F, Yamada H, Iwashita Y, Ishino K, Ishikawa R, Kovacs Z, Osvath E, Nzitakera A, Gurzu S, Sugimura H. TP53 mutations in Romanian patients with colorectal cancer. Genes Environ 2023; 45:20. [PMID: 37391803 DOI: 10.1186/s41021-023-00277-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Accepted: 06/05/2023] [Indexed: 07/02/2023] Open
Abstract
BACKGROUND Colorectal cancer (CRC) has been ranked as the second most deadly cancer and the third most diagnosed cancer cases for the year 2020. Specifically for Romania, the number of CRC-related deaths in 2019 was estimated at 6307 people, with a standardized mortality rate of 33.8 per 100,000 inhabitants. Although the tumor protein 53 (TP53) gene is intensively studied, there are few data on TP53 mutations in Romanian CRC. Furthermore, since genetic alterations may show geographical differences, our study aimed to analyze the clinical status and TP53 somatic variation in Romanian CRC patients. SUBJECTS AND METHODS DNA from 40 randomly selected cases of CRC was extracted from formalin-fixed paraffin-embedded tissues and sequenced using direct Sanger sequencing techniques, and variants were annotated according to the recommendations of the Human Genome Variation Society. Novel variants were analyzed using MutationTaster2021 to predict their effects. RESULTS The mean age was 63.6 years (range 33-85 years) with a male to female ratio of 2.3. More than 45% (18/40) had an advanced cancer stage (≥ stage III). Mutations were found in 21/40 cases (52.5%), with one case having two mutations, giving a total of twenty-two mutations in the TP53 coding DNA. These mutations include 3 (13.6%) insertion-deletion mutations, two of which are novel frameshift mutations: c.165delT (in exon 4) and c.928_935dup (in exon 9), both of which are predicted to lead to nonsense-mediated mRNA decay and are classified as deleterious. The remaining 19 (86.36%) were substitution mutations: 1 nonsense and 18 (81.8%) missense mutations, with G > A (n = 7/19; 36.8%) and C > T (n = 6/19; 31.5%) transitions being the most common. The G > T transversion was found in 21.05% (4/19) of the substitution mutations. CONCLUSION We have described two novel frameshift mutations in TP53. The discovery of novel mutations following the efforts of The Cancer Genome Atlas and other large-scale cancer genome sequencing projects may be further evidence of the heterogeneous nature of mutations in cancer and may indicate that the identification of carcinogenic mutations is not yet saturated. Further sequencing is therefore needed, especially in less studied populations. Importantly, consideration of their geographical environment will shed light on population-specific carcinogenesis.
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Affiliation(s)
- Felix Manirakiza
- Department of Tumor Pathology, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-Ku, Shizuoka, 431-3192, Japan
- Department of Pathology, School of Medicine and Pharmacy, College of Medicine and Health Sciences, University of Rwanda, P.O. Box 3286, Kigali, Rwanda
| | - Hidetaka Yamada
- Department of Tumor Pathology, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-Ku, Shizuoka, 431-3192, Japan
| | - Yuji Iwashita
- Department of Tumor Pathology, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-Ku, Shizuoka, 431-3192, Japan
| | - Keiko Ishino
- Department of Tumor Pathology, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-Ku, Shizuoka, 431-3192, Japan
| | - Rei Ishikawa
- Department of Tumor Pathology, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-Ku, Shizuoka, 431-3192, Japan
| | - Zsolt Kovacs
- Research Center of Oncopathology and Translational Research (CCOMT), George Emil Palade University of Medicine, Pharmacy, Science and Technology, Targu-Mures, 540139, Romania
| | - Eva Osvath
- Department of Pathology, George Emil Palade University of Medicine, Pharmacy, Science and Technology, Targu-Mures, 540139, Romania
| | - Augustin Nzitakera
- Department of Tumor Pathology, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-Ku, Shizuoka, 431-3192, Japan
- Department of Biomedical Laboratory Sciences, School of Health Sciences, College of Medicine and Health Sciences, University of Rwanda, P.O. Box 3286, Kigali, Rwanda
| | - Simona Gurzu
- Research Center of Oncopathology and Translational Research (CCOMT), George Emil Palade University of Medicine, Pharmacy, Science and Technology, Targu-Mures, 540139, Romania
- Department of Pathology, George Emil Palade University of Medicine, Pharmacy, Science and Technology, Targu-Mures, 540139, Romania
| | - Haruhiko Sugimura
- Department of Tumor Pathology, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-Ku, Shizuoka, 431-3192, Japan.
- Sasaki Institute, Sasaki Foundation, 2-2, Kanda Surugadai, Chiyoda-ku, Tokyo, 101-0062, Japan.
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Shen Y, Yu L, Xu X, Yu S, Yu Z. Neoantigen vaccine and neoantigen-specific cell adoptive transfer therapy in solid tumors: Challenges and future directions. CANCER INNOVATION 2022; 1:168-182. [PMID: 38090649 PMCID: PMC10686129 DOI: 10.1002/cai2.26] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2022] [Revised: 07/26/2022] [Accepted: 08/01/2022] [Indexed: 06/11/2024]
Abstract
The phenomenon of tumor hierarchy and genetic instability can be explained by the "two-hits theory" and results in the occurrence of many somatic mutations. The expression of nonsynonymous mutations results in the production of mutant proteins from tumor cells, namely tumor-specific antigens called neoantigens. Because neoantigens do not exist in healthy cells, they have the potential to stimulate antitumor immune responses by CD4+ and CD8+ T-cell activation without jeopardizing normal tissues. Immunotherapy has reshaped the cancer treatment paradigm in recent decades with the introduction of immune-checkpoint blockade therapy and transgenic T-cell receptor/chimeric antigen receptor T cells. However, these strategies performed poorly in solid tumors because of the obstacles of the immunosuppressive microenvironment caused by regulatory T cells and other suppressor cells. Therefore, other immunotherapeutic strategies are under development, such as personalized vaccines, to trigger de novo T-cell responses against neoantigens and lead to the amplification of tumor-specific T-cell subclones. Neoantigen epitope prediction algorithms have enabled the detection of neoantigens and the creation of tailored neoantigen vaccines as a result of the fast development of next-generation sequencing and cancer bioinformatics. Here we provide an overview of the current neoantigen cancer vaccines and adoptive T-cell transfer therapy with neoantigen-specific lymphocytes. We also discuss the challenges in developing neoantigen-targeted immunotherapeutic strategies for cancer.
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Affiliation(s)
- Yanwei Shen
- Shanghai Jianshan Medical Tech Co LtdShanghaiChina
| | - Lu Yu
- Shanghai Jianshan Medical Tech Co LtdShanghaiChina
| | - Xiaoli Xu
- Shanghai Jianshan Medical Tech Co LtdShanghaiChina
| | - Shaojun Yu
- Department of Surgery, The Second Affiliated HospitalZhejiang University School of MedicineHangzhouChina
| | - Zhuo Yu
- Department of Medical Oncology, Beijing Tsinghua Changgung Hospital, School of Clinical MedicineTsinghua UniversityBeijingChina
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