1
|
Cuccia F, Jafari F, D’Alessandro S, Carruba G, Craparo G, Tringali G, Blasi L, Ferrera G. Preferred Imaging for Target Volume Delineation for Radiotherapy of Recurrent Glioblastoma: A Literature Review of the Available Evidence. J Pers Med 2024; 14:538. [PMID: 38793120 PMCID: PMC11122491 DOI: 10.3390/jpm14050538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2024] [Revised: 04/29/2024] [Accepted: 05/15/2024] [Indexed: 05/26/2024] Open
Abstract
BACKGROUND Recurrence in glioblastoma lacks a standardized treatment, prompting an exploration of re-irradiation's efficacy. METHODS A comprehensive systematic review from January 2005 to May 2023 assessed the role of MRI sequences in recurrent glioblastoma re-irradiation. The search criteria, employing MeSH terms, targeted English-language, peer-reviewed articles. The inclusion criteria comprised both retrospective and prospective studies, excluding certain types and populations for specificity. The PICO methodology guided data extraction, and the statistical analysis employed Chi-squared tests via MedCalc v22.009. RESULTS Out of the 355 identified studies, 81 met the criteria, involving 3280 patients across 65 retrospective and 16 prospective studies. The key findings indicate diverse treatment modalities, with linac-based photons predominating. The median age at re-irradiation was 54 years, and the median time interval between radiation courses was 15.5 months. Contrast-enhanced T1-weighted sequences were favored for target delineation, with PET-imaging used in fewer studies. Re-irradiation was generally well tolerated (median G3 adverse events: 3.5%). The clinical outcomes varied, with a median 1-year local control rate of 61% and a median overall survival of 11 months. No significant differences were noted in the G3 toxicity and clinical outcomes based on the MRI sequence preference or PET-based delineation. CONCLUSIONS In the setting of recurrent glioblastoma, contrast-enhanced T1-weighted sequences were preferred for target delineation, allowing clinicians to deliver a safe and effective therapeutic option; amino acid PET imaging may represent a useful device to discriminate radionecrosis from recurrent disease. Future investigations, including the ongoing GLIAA, NOA-10, ARO 2013/1 trial, will aim to refine approaches and standardize methodologies for improved outcomes in recurrent glioblastoma re-irradiation.
Collapse
Affiliation(s)
- Francesco Cuccia
- Radiation Oncology, ARNAS Civico Hospital, 90100 Palermo, Italy (G.F.)
| | - Fatemeh Jafari
- Radiation Oncology Department, Imam-Khomeini Hospital Complex, Teheran University of Medical Sciences, Teheran 1416634793, Iran
| | | | - Giuseppe Carruba
- Division of Internationalization and Health Research (SIRS), ARNAS Civico Hospital, 90100 Palermo, Italy
| | | | | | - Livio Blasi
- Medical Oncology, ARNAS Civico Hospital, 90100 Palermo, Italy;
| | - Giuseppe Ferrera
- Radiation Oncology, ARNAS Civico Hospital, 90100 Palermo, Italy (G.F.)
| |
Collapse
|
2
|
Pepper NB, Eich HT, Müther M, Oertel M, Rehn S, Spille DC, Stummer W. ALA-RDT in GBM: protocol of the phase I/II dose escalation trial of radiodynamic therapy with 5-Aminolevulinic acid in patients with recurrent glioblastoma. Radiat Oncol 2024; 19:11. [PMID: 38254201 PMCID: PMC10804590 DOI: 10.1186/s13014-024-02408-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2023] [Accepted: 01/16/2024] [Indexed: 01/24/2024] Open
Abstract
BACKGROUND Despite improvements in surgical as well as adjuvant therapies over the last decades, the prognosis for patients with glioblastoma remains poor. Five-Aminolevulinic acid (5-ALA) induced porphyrins are already used for fluorescence-guided resection and as photosensitizer for photodynamic therapy. New findings reveal their potential use as sensitizing agents in combination with ionizing radiation. METHODS We initiated a phase I/II dose escalation study, treating patients with recurrence of glioblastoma with oral 5-ALA concurrent to radiotherapy (RT). This prospective single-center study based in the University Hospital Münster aims to recruit 30 patients over 18 years of age with histologically verified recurrence of supratentorial glioblastoma in good performance status (KPS ≥ 60). Following a 3 + 3 dose-escalation design, patients having undergone re-resection will receive a 36 Gy RT including radiodynamic therapy fractions (RDT). RDT constitutes of oral administration of 5-ALA before the irradiation session. Two cohorts will additionally receive two fractions of neoadjuvant treatment three and two days before surgery. To determine the maximum tolerated dose of repeated 5-ALA-administration, the number of RDT-fractions will increase, starting with one to a maximum of eight fractions, while closely monitoring for safety and toxicity. Follow-up will be performed at two and five months after treatment. Primary endpoint will be the maximum tolerated dose (MTD) of repeated ALA-administration, secondary endpoints are event-free-, progression-free-, and overall-survival. Additionally, 5-ALA metabolites and radiobiological markers will be analysed throughout the course of therapy and tissue effects after neoadjuvant treatment will be determined in resected tissue. This protocol is in accordance with the SPIRIT guidelines for clinical trial protocols. DISCUSSION This is the protocol of the ALA-RDT in GBM-study, the first-in-man evaluation of repeated administration of 5-ALA as a radiosensitizer for treatment of recurrent glioblastoma. TRIAL REGISTRATION This study was approved by the local ethics committee of the Medical Association of Westphalia-Lippe and the University of Münster on 12.10.2022, the German federal institute for Drugs and medical devices on 13.10.2022 and the federal office for radiation protection on 29.08.2022. This trial was registered on the public European EudraCT database (EudraCT-No.: 2021-004631-92) and is registered under www.cliniclatrials.gov (Identifier: NCT05590689).
Collapse
Affiliation(s)
- Niklas Benedikt Pepper
- Department of Radiation Oncology, University Hospital of Münster, Albert-Schweitzer-Campus 1, Building A1, 48149, Münster, Germany.
| | - Hans Theodor Eich
- Department of Radiation Oncology, University Hospital of Münster, Albert-Schweitzer-Campus 1, Building A1, 48149, Münster, Germany
| | - Michael Müther
- Department of Neurosurgery, University Hospital of Münster, Albert-Schweitzer-Campus 1, Building A1, 48149, Münster, Germany
| | - Michael Oertel
- Department of Radiation Oncology, University Hospital of Münster, Albert-Schweitzer-Campus 1, Building A1, 48149, Münster, Germany
| | - Stephan Rehn
- Department of Radiation Oncology, University Hospital of Münster, Albert-Schweitzer-Campus 1, Building A1, 48149, Münster, Germany
| | - Dorothee Cäcilia Spille
- Department of Neurosurgery, University Hospital of Münster, Albert-Schweitzer-Campus 1, Building A1, 48149, Münster, Germany
| | - Walter Stummer
- Department of Neurosurgery, University Hospital of Münster, Albert-Schweitzer-Campus 1, Building A1, 48149, Münster, Germany
| |
Collapse
|
3
|
Christ SM, Youssef G, Tanguturi SK, Cagney D, Shi D, McFaline-Figueroa JR, Chukwueke U, Lee EQ, Hertler C, Andratschke N, Weller M, Reardon DA, Haas-Kogan D, Guckenberger M, Wen PY, Rahman R. Re-irradiation of recurrent IDH-wildtype glioblastoma in the bevacizumab and immunotherapy era: Target delineation, outcomes and patterns of recurrence. Clin Transl Radiat Oncol 2024; 44:100697. [PMID: 38046107 PMCID: PMC10689476 DOI: 10.1016/j.ctro.2023.100697] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Revised: 10/12/2023] [Accepted: 10/28/2023] [Indexed: 12/05/2023] Open
Abstract
Introduction and background While recurrent glioblastoma patients are often treated with re-irradiation, there is limited data on the use of re-irradiation in the setting of bevacizumab (BEV), temozolomide (TMZ) re-challenge, or immune checkpoint inhibition (ICI). We describe target delineation in patients with prior anti-angiogenic therapy, assess safety and efficacy of re-irradiation, and evaluate patterns of recurrence. Materials and methods Patients with a histologically confirmed diagnosis of glioblastoma treated at a single institution between 2013 and 2021 with re-irradiation were included. Tumor, treatment and clinical data were collected. Logistic and Cox regression analysis were used for statistical analysis. Results One hundred and seventeen recurrent glioblastoma patients were identified, receiving 129 courses of re-irradiation. In 66 % (85/129) of cases, patients had prior BEV. In the 80 patients (62 %) with available re-irradiation plans, 20 (25 %) had all T2/FLAIR abnormality included in the gross tumor volume (GTV). Median overall survival (OS) for the cohort was 7.3 months, and median progression-free survival (PFS) was 3.6 months. Acute CTCAE grade ≥ 3 toxicity occurred in 8 % of cases. Concurrent use of TMZ or ICI was not associated with improved OS nor PFS. On multivariable analysis, higher KPS was significantly associated with longer OS (p < 0.01). On subgroup analysis, patients with prior BEV had significantly more marginal recurrences than those without (26 % vs. 13 %, p < 0.01). Conclusion Re-irradiation can be safely employed in recurrent glioblastoma patients. Marginal recurrence was more frequent in patients with prior BEV, suggesting a need to consider more inclusive treatment volumes incorporating T2/FLAIR abnormality.
Collapse
Affiliation(s)
- Sebastian M. Christ
- Department of Radiation Oncology, Dana-Farber/Brigham and Women’s Cancer Center, Harvard Medical School, Boston, MA, USA
- Department of Radiation Oncology, University Hospital and University of Zurich, Zurich, Switzerland
| | - Gilbert Youssef
- Center for Neuro-Oncology, Dana-Farber Cancer Institute, Boston, MA, USA
| | - Shyam K. Tanguturi
- Department of Radiation Oncology, Dana-Farber/Brigham and Women’s Cancer Center, Harvard Medical School, Boston, MA, USA
| | - Daniel Cagney
- Department of Radiation Oncology, Dana-Farber/Brigham and Women’s Cancer Center, Harvard Medical School, Boston, MA, USA
| | - Diana Shi
- Department of Radiation Oncology, Dana-Farber/Brigham and Women’s Cancer Center, Harvard Medical School, Boston, MA, USA
| | | | - Ugonma Chukwueke
- Center for Neuro-Oncology, Dana-Farber Cancer Institute, Boston, MA, USA
| | - Eudocia Q. Lee
- Center for Neuro-Oncology, Dana-Farber Cancer Institute, Boston, MA, USA
| | - Caroline Hertler
- Competence Center Palliative Care, University Hospital and University of Zurich, Zurich, Switzerland
| | - Nicolaus Andratschke
- Department of Radiation Oncology, University Hospital and University of Zurich, Zurich, Switzerland
| | - Michael Weller
- Department of Neurology, University Hospital and University of Zurich, Zurich, Switzerland
| | - David A. Reardon
- Center for Neuro-Oncology, Dana-Farber Cancer Institute, Boston, MA, USA
| | - Daphne Haas-Kogan
- Department of Radiation Oncology, Dana-Farber/Brigham and Women’s Cancer Center, Harvard Medical School, Boston, MA, USA
| | - Matthias Guckenberger
- Department of Radiation Oncology, University Hospital and University of Zurich, Zurich, Switzerland
| | - Patrick Y. Wen
- Center for Neuro-Oncology, Dana-Farber Cancer Institute, Boston, MA, USA
| | - Rifaquat Rahman
- Department of Radiation Oncology, Dana-Farber/Brigham and Women’s Cancer Center, Harvard Medical School, Boston, MA, USA
| |
Collapse
|
4
|
Marwah R, Xing D, Squire T, Soon YY, Gan HK, Ng SP. Reirradiation versus systemic therapy versus combination therapy for recurrent high-grade glioma: a systematic review and meta-analysis of survival and toxicity. J Neurooncol 2023; 164:505-524. [PMID: 37733174 PMCID: PMC10589175 DOI: 10.1007/s11060-023-04441-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2023] [Accepted: 08/28/2023] [Indexed: 09/22/2023]
Abstract
PURPOSE This review compares reirradiation (reRT), systemic therapy and combination therapy (reRT & systemic therapy) with regards to overall survival (OS), progression-free survival (PFS), adverse effects (AEs) and quality of life (QoL) in patients with recurrent high-grade glioma (rHGG). METHODS A search was performed on PubMed, Scopus, Embase and CENTRAL. Studies reporting OS, PFS, AEs and/or QoL and encompassing the following groups were included; reirradiation vs systemic therapy, combination therapy vs systemic therapy, combination therapy vs reRT, and bevacizumab-based combination therapy vs reRT with/without non-bevacizumab-based systemic therapy. Meta-analyses were performed utilising a random effects model. Certainty of evidence was assessed using GRADE. RESULTS Thirty-one studies (three randomised, twenty-eight non-randomised) comprising 2084 participants were included. In the combination therapy vs systemic therapy group, combination therapy improved PFS (HR 0.57 (95% CI 0.41-0.79); low certainty) and OS (HR 0.73 (95% CI 0.56-0.95); low certainty) and there was no difference in grade 3 + AEs (RR 1.03 (95% CI 0.57-1.86); very low certainty). In the combination therapy vs reRT group, combination therapy improved PFS (HR 0.52 (95% CI 0.38-0.72); low certainty) and OS (HR 0.69 (95% CI 0.52-0.93); low certainty). In the bevacizumab-based combination therapy vs reRT with/without non-bevacizumab-based systemic therapy group, adding bevacizumab improved PFS (HR 0.46 (95% CI 0.27-0.77); low certainty) and OS (HR 0.42 (95% CI 0.24-0.72; low certainty) and reduced radionecrosis (RR 0.17 (95% CI 0.06-0.48); low certainty). CONCLUSIONS Combination therapy may improve OS and PFS with acceptable toxicities in patients with rHGG compared to reRT or systemic therapy alone. Particularly, combining bevacizumab with reRT prophylactically reduces radionecrosis. REGISTRATION CRD42022291741.
Collapse
Affiliation(s)
- Ravi Marwah
- Department of Radiation Oncology, Townsville University Hospital, 100 Angus Smith Drive, Douglas, Townsville, QLD, 4814, Australia.
- College of Medicine and Dentistry, James Cook University, Townsville, Australia.
| | - Daniel Xing
- Department of Radiation Oncology, Townsville University Hospital, 100 Angus Smith Drive, Douglas, Townsville, QLD, 4814, Australia
- College of Medicine and Dentistry, James Cook University, Townsville, Australia
| | - Timothy Squire
- Department of Radiation Oncology, Townsville University Hospital, 100 Angus Smith Drive, Douglas, Townsville, QLD, 4814, Australia
- College of Medicine and Dentistry, James Cook University, Townsville, Australia
| | - Yu Yang Soon
- Department of Radiation Oncology, National University Cancer Institute, Singapore, Singapore
| | - Hui K Gan
- Department of Medical Oncology, Olivia Newton-John Cancer Wellness & Research Centre, Austin Health, Melbourne, Australia
- Cancer Therapies and Biology Group, Centre of Research Excellence in Brain Tumours, Olivia Newton-John Cancer Wellness & Research Centre, Austin Hospital, Melbourne, Australia
| | - Sweet Ping Ng
- Department of Radiation Oncology, Olivia Newton-John Cancer Wellness & Research Centre, Austin Health, Melbourne, Australia
| |
Collapse
|
5
|
Nieder C, Willmann J, Andratschke NH. Prospective randomized clinical studies involving reirradiation: update of a systematic review. Strahlenther Onkol 2023; 199:787-797. [PMID: 37500926 PMCID: PMC10449695 DOI: 10.1007/s00066-023-02118-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2023] [Accepted: 07/04/2023] [Indexed: 07/29/2023]
Abstract
BACKGROUND Reirradiation is a potentially useful option for many patients with recurrent cancer, aiming at cure or symptom palliation, depending on disease/recurrence type and stage. The purpose of this follow-up study to a previous review from 2016 was to summarize all recently published randomized trials. Points of interest again included identifcation of methodological strengths and weaknesses, practice-changing results, and open questions. MATERIAL AND METHODS Systematic review of trials published between 2015 and February 2023. RESULTS We reviewed 7 additional trials, most of which addressed reirradiation of head and neck or brain tumours. The median number of patients was 60. Mirroring the previous review, trial design, primary endpoints and statistical hypotheses varied widely. The updated results only impact on decision making for reirradiation of nasopharynx cancer and glioma. Patients with one of these diseases, as well as other head and neck cancers, may benefit from reirradiation-induced local control, e.g. in terms of progression-free survival. For the first time, hyperfractionated radiotherapy emerged as preferred option for recurrent, inoperable nasopharynx cancer. Despite better therapeutic ratio with hyperfractionation, serious toxicity remains a concern after high cumulative total doses. Randomized trials are still lacking for prostate cancer and other sites. CONCLUSION Multicentric randomized trials on reirradiation are feasible and continue to refine the current standard of care for recurrent disease after previous radiotherapy. Ongoing prospective studies such as the European Society for Radiotherapy and Oncology and European Organisation for Research and Treatment of Cancer (ESTRO-EORTC) observational cohort ReCare (NCT: NCT03818503) will further shape the clinical practice of reirradiation.
Collapse
Affiliation(s)
- Carsten Nieder
- Department of Oncology and Palliative Medicine, Nordland Hospital Trust, 8092, Bodø, Norway.
- Department of Clinical Medicine, Faculty of Health Sciences, UiT-The Arctic University of Norway, 9038, Tromsø, Norway.
| | - Jonas Willmann
- Department of Radiation Oncology, University Hospital Zürich, 8091, Zurich, Switzerland
| | | |
Collapse
|
6
|
Vaz-Salgado MA, Villamayor M, Albarrán V, Alía V, Sotoca P, Chamorro J, Rosero D, Barrill AM, Martín M, Fernandez E, Gutierrez JA, Rojas-Medina LM, Ley L. Recurrent Glioblastoma: A Review of the Treatment Options. Cancers (Basel) 2023; 15:4279. [PMID: 37686553 PMCID: PMC10487236 DOI: 10.3390/cancers15174279] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Revised: 08/14/2023] [Accepted: 08/17/2023] [Indexed: 09/10/2023] Open
Abstract
Glioblastoma is a disease with a poor prognosis. Multiple efforts have been made to improve the long-term outcome, but the 5-year survival rate is still 5-10%. Recurrence of the disease is the usual way of progression. In this situation, there is no standard treatment. Different treatment options can be considered. Among them would be reoperation or reirradiation. There are different studies that have assessed the impact on survival and the selection of patients who may benefit most from these strategies. Chemotherapy treatments have also been considered in several studies, mainly with alkylating agents, with data mostly from phase II studies. On the other hand, multiple studies have been carried out with target-directed treatments. Bevacizumab, a monoclonal antibody with anti-angiogenic activity, has demonstrated activity in several studies, and the FDA has approved it for this indication. Several other TKI drugs have been evaluated in this setting, but no clear benefit has been demonstrated. Immunotherapy treatments have been shown to be effective in other types of tumors, and several studies have evaluated their efficacy in this disease, both immune checkpoint inhibitors, oncolytic viruses, and vaccines. This paper reviews data from different studies that have evaluated the efficacy of different forms of relapsed glioblastoma.
Collapse
Affiliation(s)
- Maria Angeles Vaz-Salgado
- Medical Oncology Department, Ramon y Cajal University Hospital, 28034 Madrid, Spain; (M.V.); (V.A.); (V.A.); (P.S.); (J.C.); (D.R.); (A.M.B.)
| | - María Villamayor
- Medical Oncology Department, Ramon y Cajal University Hospital, 28034 Madrid, Spain; (M.V.); (V.A.); (V.A.); (P.S.); (J.C.); (D.R.); (A.M.B.)
| | - Víctor Albarrán
- Medical Oncology Department, Ramon y Cajal University Hospital, 28034 Madrid, Spain; (M.V.); (V.A.); (V.A.); (P.S.); (J.C.); (D.R.); (A.M.B.)
| | - Víctor Alía
- Medical Oncology Department, Ramon y Cajal University Hospital, 28034 Madrid, Spain; (M.V.); (V.A.); (V.A.); (P.S.); (J.C.); (D.R.); (A.M.B.)
| | - Pilar Sotoca
- Medical Oncology Department, Ramon y Cajal University Hospital, 28034 Madrid, Spain; (M.V.); (V.A.); (V.A.); (P.S.); (J.C.); (D.R.); (A.M.B.)
| | - Jesús Chamorro
- Medical Oncology Department, Ramon y Cajal University Hospital, 28034 Madrid, Spain; (M.V.); (V.A.); (V.A.); (P.S.); (J.C.); (D.R.); (A.M.B.)
| | - Diana Rosero
- Medical Oncology Department, Ramon y Cajal University Hospital, 28034 Madrid, Spain; (M.V.); (V.A.); (V.A.); (P.S.); (J.C.); (D.R.); (A.M.B.)
| | - Ana M. Barrill
- Medical Oncology Department, Ramon y Cajal University Hospital, 28034 Madrid, Spain; (M.V.); (V.A.); (V.A.); (P.S.); (J.C.); (D.R.); (A.M.B.)
| | - Mercedes Martín
- Radiotherapy Oncology Department, Ramon y Cajal University Hospital, 28034 Madrid, Spain; (M.M.); (E.F.)
| | - Eva Fernandez
- Radiotherapy Oncology Department, Ramon y Cajal University Hospital, 28034 Madrid, Spain; (M.M.); (E.F.)
| | - José Antonio Gutierrez
- Neurosurgery Department, Ramon y Cajal University Hospital, 28034 Madrid, Spain; (J.A.G.); (L.M.R.-M.); (L.L.)
| | - Luis Mariano Rojas-Medina
- Neurosurgery Department, Ramon y Cajal University Hospital, 28034 Madrid, Spain; (J.A.G.); (L.M.R.-M.); (L.L.)
| | - Luis Ley
- Neurosurgery Department, Ramon y Cajal University Hospital, 28034 Madrid, Spain; (J.A.G.); (L.M.R.-M.); (L.L.)
| |
Collapse
|
7
|
Bürkel F, Jost T, Hecht M, Heinzerling L, Fietkau R, Distel L. Dual mTOR/DNA-PK Inhibitor CC-115 Induces Cell Death in Melanoma Cells and Has Radiosensitizing Potential. Int J Mol Sci 2020; 21:ijms21239321. [PMID: 33297429 PMCID: PMC7730287 DOI: 10.3390/ijms21239321] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 12/03/2020] [Accepted: 12/05/2020] [Indexed: 12/20/2022] Open
Abstract
CC-115 is a dual inhibitor of the mechanistic target of rapamycin (mTOR) kinase and the DNA-dependent protein kinase (DNA-PK) that is currently being studied in phase I/II clinical trials. DNA-PK is essential for the repair of DNA-double strand breaks (DSB). Radiotherapy is frequently used in the palliative treatment of metastatic melanoma patients and induces DSBs. Melanoma cell lines and healthy-donor skin fibroblast cell lines were treated with CC‑115 and ionizing irradiation (IR). Apoptosis, necrosis, and cell cycle distribution were analyzed. Colony forming assays were conducted to study radiosensitizing effects. Immunofluorescence microscopy was performed to determine the activity of homologous recombination (HR). In most of the malign cell lines, an increasing concentration of CC-115 resulted in increased cell death. Furthermore, strong cytotoxic effects were only observed in malignant cell lines. Regarding clonogenicity, all cell lines displayed decreased survival fractions during combined inhibitor and IR treatment and supra-additive effects of the combination were observable in 5 out of 9 melanoma cell lines. CC-115 showed radiosensitizing potential in 7 out of 9 melanoma cell lines, but not in healthy skin fibroblasts. Based on our data CC-115 treatment could be a promising approach for patients with metastatic melanoma, particularly in the combination with radiotherapy.
Collapse
Affiliation(s)
- Felix Bürkel
- Department of Radiation Oncology, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Universitätsstr. 27, 91054 Erlangen, Germany; (F.B.); (T.J.); (M.H.); (R.F.)
| | - Tina Jost
- Department of Radiation Oncology, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Universitätsstr. 27, 91054 Erlangen, Germany; (F.B.); (T.J.); (M.H.); (R.F.)
| | - Markus Hecht
- Department of Radiation Oncology, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Universitätsstr. 27, 91054 Erlangen, Germany; (F.B.); (T.J.); (M.H.); (R.F.)
| | - Lucie Heinzerling
- Department of Dermatology, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Ulmenweg 18, 91054 Erlangen, Germany;
| | - Rainer Fietkau
- Department of Radiation Oncology, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Universitätsstr. 27, 91054 Erlangen, Germany; (F.B.); (T.J.); (M.H.); (R.F.)
| | - Luitpold Distel
- Department of Radiation Oncology, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Universitätsstr. 27, 91054 Erlangen, Germany; (F.B.); (T.J.); (M.H.); (R.F.)
- Correspondence: ; Tel.: +49-9131-85-32312
| |
Collapse
|