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Breast cancer
PIK3CA Mutation is Associated with Poor Response to HER2-Targeted Therapy in Breast Cancer Patients
Ju Won Kim, Ah Reum Lim, Ji Young You, Jung Hyun Lee, Sung Eun Song, Nam Kwon Lee, Seung Pil Jung, Kyu Ran Cho, Cheol Yong Kim, Kyong Hwa Park
Cancer Res Treat. 2023;55(2):531-541.   Published online September 7, 2022
DOI: https://doi.org/10.4143/crt.2022.221
AbstractAbstract PDFSupplementary MaterialPubReaderePub
Purpose
Mutations in the PIK3CA gene occur frequently in breast cancer patients. Activating PIK3CA mutations confer resistance to human epidermal growth factor receptor 2 (HER2)-targeted treatments. In this study, we investigated whether PIK3CA mutations were correlated with treatment response or duration in patients with HER2-positive (HER2+) breast cancer.
Materials and Methods
We retrospectively reviewed the clinical information of patients with HER2+ breast cancer who received HER2-targeted therapy for early-stage or metastatic cancers. The pathologic complete response (pCR), progression-free survival (PFS), and overall survival were compared between patients with wild-type PIK3CA (PIK3CAw) and those with mutated PIK3CA (PIK3CAm). Next-generation sequencing was combined with examination of PFS associated with anti-HER2 monoclonal antibody (mAb) treatment.
Results
Data from 90 patients with HER2+ breast cancer were analyzed. Overall, 34 (37.8%) patients had pathogenic PIK3CA mutations. The pCR rate of the PIK3CAm group was lower than that of the PIK3CAw group among patients who received neoadjuvant chemotherapy for early-stage cancer. In the metastatic setting, the PIK3CAm group showed a significantly shorter mean PFS (mPFS) with first-line anti-HER2 mAb. The mPFS of second-line T-DM1 was lower in the PIK3CAm group than that in the PIK3CAw group. Sequencing revealed differences in the mutational landscape between PIK3CAm and PIK3CAw tumors.
Conclusion
Patients with HER2+ breast cancer with activating PIK3CA mutations had lower pCR rates and shorter PFS with palliative HER2-targeted therapy than those with wild-type PIK3CA. Precise targeted-therapy is needed to improve survival of patients with HER2+/PIK3CAm breast cancer.

Citations

Citations to this article as recorded by  
  • Safety and efficacy of pyrotinib for HER‑2‑positive breast cancer in the neoadjuvant setting: A systematic review and meta‑analysis
    Qian Ma, Bai Wei, Bi-Cheng Wang, Ganxin Wang, Xuan Zhou, Yan Wang
    Oncology Letters.2024;[Epub]     CrossRef
  • A novel PIK3CA hot-spot mutation in breast cancer patients detected by HRM-COLD-PCR analysis
    Saoussen Debouki-Joudi, Wala Ben Kridis, Fatma Trifa, Wajdi Ayadi, Abdelmajid Khabir, Tahia Sellami-Boudawara, Jamel Daoud, Afef Khanfir, Raja Mokdad-Gargouri
    Breast Disease.2024; 43(1): 213.     CrossRef
  • Liquid Biopsy in the Clinical Management of Cancers
    Ho-Yin Ho, Kei-See (Kasey) Chung, Chau-Ming Kan, Sze-Chuen (Cesar) Wong
    International Journal of Molecular Sciences.2024; 25(16): 8594.     CrossRef
  • Modeling the management of patients with human epidermal growth factor receptor 2-positive breast cancer with liquid biopsy: the future of precision medicine
    Eleonora Nicolò, Caterina Gianni, Giuseppe Curigliano, Carolina Reduzzi, Massimo Cristofanilli
    Current Opinion in Oncology.2024; 36(6): 503.     CrossRef
  • Current progress in chimeric antigen receptor-modified T cells for the treatment of metastatic breast cancer
    Li Yin, Gui-lai Chen, Zhuo Xiang, Yu-lin Liu, Xing-yu Li, Jing-wang Bi, Qiang Wang
    Biomedicine & Pharmacotherapy.2023; 162: 114648.     CrossRef
  • Genomic analysis of plasma circulating tumor DNA in patients with heavily pretreated HER2 + metastatic breast cancer
    Kyoungmin Lee, Jongwon Lee, Jungmin Choi, Sung Hoon Sim, Jeong Eun Kim, Min Hwan Kim, Yeon Hee Park, Jee Hyun Kim, Su-Jin Koh, Kyong Hwa Park, Myoung Joo Kang, Mi Sun Ahn, Kyoung Eun Lee, Hee-Jun Kim, Hee Kyung Ahn, Han Jo Kim, Keon Uk Park, In Hae Park
    Scientific Reports.2023;[Epub]     CrossRef
  • Association of PIK3CA mutation with outcomes in HER2-positive breast cancer treated with anti-HER2 therapy: A meta-analysis and bioinformatic analysis of TCGA‑BRCA data
    Haizhu Chen, Xingbin Hu, Daquan Wang, Ying Wang, Yunfang Yu, Herui Yao
    Translational Oncology.2023; 37: 101738.     CrossRef
  • Appraisal of Systemic Treatment Strategies in Early HER2-Positive Breast Cancer—A Literature Review
    Danilo Giffoni de Mello Morais Mata, Rania Chehade, Malek B. Hannouf, Jacques Raphael, Phillip Blanchette, Abdullah Al-Humiqani, Monali Ray
    Cancers.2023; 15(17): 4336.     CrossRef
  • The clinical significance of HER2 expression in DCIS
    Ioanna Akrida, Francesk Mulita
    Medical Oncology.2022;[Epub]     CrossRef
  • 7,208 View
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  • 8 Web of Science
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Genomic Signatures from Clinical Tumor Sequencing in Patients with Breast Cancer Having Germline BRCA1/2 Mutation
Ju Won Kim, Hyo Eun Kang, Jimi Choi, Seung Gyu Yun, Seung Pil Jung, Soo Yeon Bae, Ji Young You, Yoon-Ji Choi, Yeul Hong Kim, Kyong Hwa Park
Cancer Res Treat. 2023;55(1):155-166.   Published online June 8, 2022
DOI: https://doi.org/10.4143/crt.2021.1567
AbstractAbstract PDFSupplementary MaterialPubReaderePub
Purpose
BRCA1 and BRCA2 are among the most important genes involved in DNA repair via homologous recombination (HR). Germline BRCA1/2 (gBRCA1/2)-related cancers have specific characteristics and treatment options but conducting gBRCA1/2 testing and interpreting the genetic imprint are sometimes complicated. Here, we describe the concordance of gBRCA1/2 derived from a panel of clinical tumor tissues using next-generation sequencing (NGS) and genetic aspects of tumors harboring gBRCA1/2 pathogenic variants.
Materials and Methods
Targeted sequencing was performed using available tumor tissue from patients who underwent gBRCA1/2 testing. Comparative genomic analysis was performed according to gBRCA1/2 pathogenicity.
Results
A total of 321 patients who underwent gBRCA1/2 testing were screened, and 26 patients with gBRCA1/2 pathogenic (gBRCA1/2p) variants, eight patients with gBRCA1/2 variants of uncertain significance (VUS; gBRCA1/2v), and 43 patients with gBRCA1/2 wild-type (gBRCA1/2w) were included in analysis. Mutations in TP53 (49.4%) and PIK3CA (23.4%) were frequently detected in all samples. The number of single-nucleotide variants (SNVs) per tumor tissue was higher in the gBRCA1/2w group than that in the gBRCA1/2p group (14.81 vs. 18.86, p=0.278). Tumor mutation burden (TMB) was significantly higher in the gBRCA1/2w group than in the gBRCA1/2p group (10.21 vs. 13.47, p=0.017). Except for BRCA1/2, other HR-related genes were frequently mutated in patients with gBRCA1/2w.
Conclusion
We demonstrated high sensitivity of gBRCA1/2 in tumors analyzed by NGS using a panel of tumor tissues. TMB value and aberration of non-BRCA1/2 HR-related genes differed significantly according to gBRCA1/2 pathogenicity in patients with breast cancer.

Citations

Citations to this article as recorded by  
  • Clinico-Pathological Factors Determining Recurrence of Phyllodes Tumors of the Breast: The 25-Year Experience at a Tertiary Cancer Centre
    Baijaeek Sain, Arnab Gupta, Aruni Ghose, Sudip Halder, Vishal Mukherjee, Samir Bhattacharya, Radha Raman Mondal, Aditya Narayan Sen, Bijan Saha, Shravasti Roy, Stergios Boussios
    Journal of Personalized Medicine.2023; 13(5): 866.     CrossRef
  • 6,146 View
  • 203 Download
  • 1 Web of Science
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Clinicopathological Features of Patients with the BRCA1 c.5339T>C (p.Leu1780Pro) Variant
Hyung Seok Park, Jai Min Ryu, Ji Soo Park, Seock-Ah Im, So-Youn Jung, Eun-Kyu Kim, Woo-Chan Park, Jun Won Min, Jeeyeon Lee, Ji Young You, Jeong Eon Lee, Sung-Won Kim
Cancer Res Treat. 2020;52(3):680-688.   Published online January 28, 2020
DOI: https://doi.org/10.4143/crt.2019.351
AbstractAbstract PDFSupplementary MaterialPubReaderePub
Purpose
Recent studies revealed the BRCA1 c.5339T>C, p.Leu1780Pro variant (L1780P) is highly suggested as a likely pathogenic. The aim of this study was to evaluate clinicopathologic features of L1780P with breast cancer (BC) using multicenter data from Korea to reinforce the evidence as a pathogenic mutation and to compare L1780P and other BRCA1/2mutations using Korean Hereditary Breast Cancer (KOHBRA) study data.
Materials and Methods
The data of 54 BC patients with L1780P variant from 10 institutions were collected and the clinicopathologic characteristics of the patients were reviewed. The hereditary breast and/or ovarian cancer–related characteristics of the L1780P variant were compared to those of BC patients in the KOHBRA study.
Results
The median age of all patients was 38 years, and 75.9% of cases showed triple-negative breast cancer. Comparison of cases with L1780P to carriers from the KOHBRA study revealed that the L1780P patients group was more likely to have family history (FHx) of ovarian cancer (OC) (24.1% vs. 19.6% vs. 11.2%, p < 0.001 and p=0.001) and a personal history of OC (16.7% vs. 2.9% vs. 1.3%, p=0.003 and p=0.001) without significant difference in FHx of BC and bilateral BC. The cumulative risk of contralateral BC at 10 years after diagnosis was 31.9%, while the cumulative risk of OC at 50 years of age was 20.0%. Patients with L1780P showed similar features with BRCA1 carriers and showed higher penetrance of OC than patients with other BRCA1 mutations.
Conclusion
L1780P should be considered as a pathogenic mutation. Risk-reducing salpingo-oophorectomy is highly recommended for women with L1780P.

Citations

Citations to this article as recorded by  
  • Whole Exome-Wide Association Identifies Rare Variants in GALNT9 Associated with Middle Eastern Papillary Thyroid Carcinoma Risk
    Rong Bu, Abdul K. Siraj, Saud Azam, Kaleem Iqbal, Zeeshan Qadri, Maha Al-Rasheed, Saif S. Al-Sobhi, Fouad Al-Dayel, Khawla S. Al-Kuraya
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    Scientific Reports.2022;[Epub]     CrossRef
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    Jeong Dong Lee, Won-Ji Ryu, Hyun Ju Han, Tae Yeong Kim, Min Hwan Kim, Joohyuk Sohn
    Cancers.2022; 14(10): 2405.     CrossRef
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    Cancer Genetics.2022; 266-267: 19.     CrossRef
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    Diagnostics.2021; 11(2): 370.     CrossRef
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    Cancers.2021; 13(9): 2192.     CrossRef
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Impact of Molecular Subtype Conversion of Breast Cancers after Neoadjuvant Chemotherapy on Clinical Outcome
Siew Kuan Lim, Moo Hyun Lee, In Hae Park, Ji Young You, Byung-Ho Nam, Byeong Nam Kim, Jungsil Ro, Keun Seok Lee, So-Youn Jung, Young Mee Kwon, Eun Sook Lee
Cancer Res Treat. 2016;48(1):133-141.   Published online April 7, 2015
DOI: https://doi.org/10.4143/crt.2014.262
AbstractAbstract PDFPubReaderePub
Purpose
The aim of this study was to examine molecular subtype conversions in patients who underwent neoadjuvant chemotherapy (NAC) and analyze their clinical implications.
Materials and Methods
We included consecutive breast cancer patients who received NAC at the National Cancer Center, Korea, between August 2002 and June 2011, and had available data on estrogen receptor (ER), progesterone receptor (PR), and human epidermal growth factor 2 (HER2) receptor status prior to NAC. Molecular subtypes, hormone receptor (HR) status, and ER and PR Allred scores before and after NAC were compared, and the long-term outcomes were analyzed.
Results
Of 322 patients, 32 (9.9%) achieved a pathologic complete response after NAC. HR+/HER2– tumors tended to convert into triple negative (TN) tumors (10.3%), whereas 34.6% of TN tumors gained HR positivity to become HR+/HER2– tumors. Clinical outcomes of molecular subtype conversion groups were compared against patients who remained as HR+/HER2– throughout. The HR+/HER2– to TN group had significantly poorer recurrencefree survival (RFS) (hazard ratio, 3.54; 95% confidence interval [CI], 1.60 to 7.85) and overall survival (OS) (hazard ratio, 3.73; 95% CI, 1.34 to 10.38). Patients who remained TN throughout had the worst outcomes (for RFS: hazard ratio, 3.70; 95% CI, 1.86 to 7.36; for OS: hazard ratio, 5.85; 95% CI, 2.53 to 13.51), while those who converted from TN to HR+/HER2– showed improved comparable survival outcomes.
Conclusion
Molecular subtypes of breast cancers changed frequently after NAC, resulting in different tumor prognostication. Tumor subtyping should be repeated after NAC in patients with breast cancer.

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