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Zheng A, Bilbao M, Sookram J, Linden KM, Morgan AB, Ostrovsky O. Epigenetic drugs induce the potency of classic chemotherapy, suppress post-treatment re-growth of breast cancer, but preserve the wound healing ability of stem cells. Cancer Biol Ther 2022; 23:254-264. [PMID: 35389825 PMCID: PMC8993057 DOI: 10.1080/15384047.2022.2052540] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022] Open
Abstract
Epigenetic therapy augments neoadjuvant chemotherapy (NACT) in breast cancer and may aid post-surgical wound healing affected by NACT. Our study investigates: (1) The cytotoxicity of classic paclitaxel chemotherapy on triple negative breast cancer (TNBC) independently and in combination with epigenetic drugs. (2) The sustainable inhibition of breast cancer regrowth following paclitaxel and epigenetic therapies. (3) The effects of paclitaxel with and without epigenetic therapy on the post-treatment viability and wound healing potential of adipose stem cells (ASCs). Cytotoxicity assays were performed on TNBC and ASCs. Cells were treated and recovered in drug-free medium. Cell viability was measured via cell counts and MTT assays. W -ound healing was tested with scratch assays. The combination of epigenetic drugs shows increased toxicity against TNBC cells compared to standard chemotherapy alone. Moreover, the combination of paclitaxel with epigenetic treatments causes cancer toxicity that is sustainable to TNBC cells after the drugs' removal with minimal effect on ASCs wound healing ability. The use of epigenetic drugs in addition to standard chemotherapy is cytotoxic to TNBC cells and prevents post-treatment recovery of TNBC while maintaining ASC wound healing ability. This strategy may be useful in maximizing post-surgical wound healing following NACT in TNBC.
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Affiliation(s)
- Andrew Zheng
- Department of General Surgery, Cooper University Healthcare, Camden, NJ, USA
| | - Michelle Bilbao
- Department of Gynecologic Oncology, MD Anderson Cancer Center at Cooper, Camden, NJ, USA
| | - Janhvi Sookram
- Department of Gynecologic Oncology, MD Anderson Cancer Center at Cooper, Camden, NJ, USA
| | - Kimberly M Linden
- Department of General Surgery, Cooper University Healthcare, Camden, NJ, USA
| | - Andrew B Morgan
- Department of General Surgery, Cooper University Healthcare, Camden, NJ, USA
| | - Olga Ostrovsky
- Division of Surgical Research, Cooper University Healthcare, Camden, NJ, USA
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Lesko P, Chovanec M, Mego M. Biomarkers of disease recurrence in stage I testicular germ cell tumours. Nat Rev Urol 2022; 19:637-658. [PMID: 36028719 DOI: 10.1038/s41585-022-00624-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/29/2022] [Indexed: 11/09/2022]
Abstract
Stage I testicular cancer is a disease restricted to the testicle. After orchiectomy, patients are considered to be without disease; however, the tumour is prone to relapse in ~4-50% of patients. Current predictive markers of relapse, which are tumour size and invasion to rete testis (in seminoma) or lymphovascular invasion (in non-seminoma), have limited clinical utility and are unable to correctly predict relapse in a substantial proportion of patients. Adjuvant therapeutic strategies based on available biomarkers can lead to overtreatment of 50-85% of patients. Discovery and implementation of novel biomarkers into treatment decision making will help to reduce the burden of adjuvant treatments and improve patient selection for adjuvant therapy.
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Affiliation(s)
- Peter Lesko
- 2nd Department of Oncology, Faculty of Medicine, Comenius University and National Cancer Institute, Bratislava, Slovakia
| | - Michal Chovanec
- 2nd Department of Oncology, Faculty of Medicine, Comenius University and National Cancer Institute, Bratislava, Slovakia
| | - Michal Mego
- 2nd Department of Oncology, Faculty of Medicine, Comenius University and National Cancer Institute, Bratislava, Slovakia.
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Gu D, Dong K, Jiang A, Jiang S, Fu Z, Bao Y, Huang F, Yang C, Wang L. PBRM1 Deficiency Sensitizes Renal Cancer Cells to DNMT Inhibitor 5-Fluoro-2'-Deoxycytidine. Front Oncol 2022; 12:870229. [PMID: 35719970 PMCID: PMC9204009 DOI: 10.3389/fonc.2022.870229] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2022] [Accepted: 05/11/2022] [Indexed: 11/26/2022] Open
Abstract
PBRM1 is a tumor suppressor frequently mutated in clear cell renal cell carcinoma. However, no effective targeted therapies exist for ccRCC with PBRM1 loss. To identify novel therapeutic approaches to targeting PBRM1-deficient renal cancers, we employed a synthetic lethality compound screening in isogenic PBRM1+/+ and PBRM1-/- 786-O renal tumor cells and found that a DNMT inhibitor 5-Fluoro-2’-deoxycytidine (Fdcyd) selectively inhibit PBRM1-deficient tumor growth. RCC cells lacking PBRM1 show enhanced DNA damage response, which leads to sensitivity to DNA toxic drugs. Fdcyd treatment not only induces DNA damage, but also re-activated a pro-apoptotic factor XAF1 and further promotes the genotoxic stress-induced PBRM1-deficient cell death. This study shows a novel synthetic lethality interaction between PBRM1 loss and Fdcyd treatment and indicates that DNMT inhibitor represents a novel strategy for treating ccRCC with PBRM1 loss-of-function mutations.
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Affiliation(s)
- Di Gu
- Department of Urology, Changhai Hospital, Naval Medical University, Shanghai, China
| | - Kai Dong
- Department of Urology, Changhai Hospital, Naval Medical University, Shanghai, China
| | - Aimin Jiang
- Department of Urology, Changhai Hospital, Naval Medical University, Shanghai, China
| | - Shaoqin Jiang
- Department of Urology, Changhai Hospital, Naval Medical University, Shanghai, China.,Department of Urology, Fujian Union Hospital, Fujian Medical University, Fuzhou, China
| | - Zhibin Fu
- Department of Urology, Changhai Hospital, Naval Medical University, Shanghai, China
| | - Yewei Bao
- Department of Urology, Changhai Hospital, Naval Medical University, Shanghai, China
| | - Fuzhao Huang
- Department of Urology, Changhai Hospital, Naval Medical University, Shanghai, China
| | - Chenghua Yang
- Department of Urology, Changhai Hospital, Naval Medical University, Shanghai, China
| | - Linhui Wang
- Department of Urology, Changhai Hospital, Naval Medical University, Shanghai, China
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Rose M, Burgess JT, O’Byrne K, Richard DJ, Bolderson E. PARP Inhibitors: Clinical Relevance, Mechanisms of Action and Tumor Resistance. Front Cell Dev Biol 2020; 8:564601. [PMID: 33015058 PMCID: PMC7509090 DOI: 10.3389/fcell.2020.564601] [Citation(s) in RCA: 297] [Impact Index Per Article: 74.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2020] [Accepted: 08/13/2020] [Indexed: 12/11/2022] Open
Abstract
The Poly (ADP-ribose) polymerase (PARP) family has many essential functions in cellular processes, including the regulation of transcription, apoptosis and the DNA damage response. PARP1 possesses Poly (ADP-ribose) activity and when activated by DNA damage, adds branched PAR chains to facilitate the recruitment of other repair proteins to promote the repair of DNA single-strand breaks. PARP inhibitors (PARPi) were the first approved cancer drugs that specifically targeted the DNA damage response in BRCA1/2 mutated breast and ovarian cancers. Since then, there has been significant advances in our understanding of the mechanisms behind sensitization of tumors to PARP inhibitors and expansion of the use of PARPi to treat several other cancer types. Here, we review the recent advances in the proposed mechanisms of action of PARPi, biomarkers of the tumor response to PARPi, clinical advances in PARPi therapy, including the potential of combination therapies and mechanisms of tumor resistance.
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Affiliation(s)
- Maddison Rose
- Cancer & Ageing Research Program, School of Biomedical Sciences, Institute of Health and Biomedical Innovation, Translational Research Institute, Queensland University of Technology, Brisbane, QLD, Australia
| | - Joshua T. Burgess
- Cancer & Ageing Research Program, School of Biomedical Sciences, Institute of Health and Biomedical Innovation, Translational Research Institute, Queensland University of Technology, Brisbane, QLD, Australia
| | - Kenneth O’Byrne
- Cancer & Ageing Research Program, School of Biomedical Sciences, Institute of Health and Biomedical Innovation, Translational Research Institute, Queensland University of Technology, Brisbane, QLD, Australia
- Princess Alexandra Hospital, Brisbane, QLD, Australia
| | - Derek J. Richard
- Cancer & Ageing Research Program, School of Biomedical Sciences, Institute of Health and Biomedical Innovation, Translational Research Institute, Queensland University of Technology, Brisbane, QLD, Australia
| | - Emma Bolderson
- Cancer & Ageing Research Program, School of Biomedical Sciences, Institute of Health and Biomedical Innovation, Translational Research Institute, Queensland University of Technology, Brisbane, QLD, Australia
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Abstract
PURPOSE OF REVIEW Despite the high cure rate of germ-cell tumors (GCTs), the 5-year survival rate for those patients with metastatic poor-risk GCT rarely exceeds 50%. The purpose of this review is to highlight past and recent discoveries in the treatment of patients with poor-risk GCT. RECENT FINDINGS Multiple clinical trials to optimize the management of poor-risk germ-cell cancer are ongoing. First-line phase II clinical trials of dose-dense multidrug and paclitaxel-based regimens such as accelerated bleomycin, etoposide, and cisplatin (BEP), dose-dense chemotherapy and paclitaxel, ifosfamide, and cisplatin (TIP) reported promising results. Positive phase III data are still lacking. SUMMARY Four cycles of BEP or Etoposide (VP16), ifosfamide, cisplatin (VIP) continue to be the standard of care in patients with poor-risk GCT. A significant disparity in patient outcome exists between high-volume and low-volume centers. Referral for centers of excellence should be considered in the management of poor-risk GCT.
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