Clément Klein

Dr. Clément Klein

orcid

Research Focus & Metrics

Academic Career Length

5Years (2022-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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19 November 2022 in Cancers
Verified
Journal Article
Open access
PDF file
CAClément Allenet
Clément Allenet
CKClément Klein
Clément Klein
BRBenjamin Rouget
Benjamin Rouget
GMGaëlle Margue
Gaëlle Margue
GCGrégoire Capon
Grégoire Capon
Jean-Christophe BERNHARDJean-Christophe BERNHARD
Jean-Christophe BERNHARD
Recent studies suggested that the neutrophil-to-lymphocyte ratio (NLR) could play a key role in tumor initiation, progression and response to treatments. The main objective was to assess the prognostic value of the pre-operative NLR on recurrence-free survival (RFS) in patients with non-hereditary localized renal cell carcinoma. From the UroCCR database (NCT03293563), factors influencing the disease recurrence of consecutive patients who underwent nephrectomy for cT1-T4 N0M0 were analyzed using multi-variate cox regression and log-rank methods. We included 786 patients, among which 135 (17.2%) experienced a recurrence at a median time of 23.7 [8.5–48.6] months. RFS for patients with a pre-operative NLR of <2.7 was 94% and 88% at 3 and 5 years, respectively, versus 76% and 63% for patients with a NLR of ≥2.7 (p < 0.001, log-rank test). To predict the risk of post-operative recurrence, the NLR was combined with the UCLA integrated staging system (UISS), and we defined four groups of the UroCCR-61 predictive model. The RFS rates at 3 and 5 years were 100% and 97% in the very-low-risk group, 93% and 86% in the low-risk group, 78% and 68% in the intermediate-risk group and 63% and 46% in the high-risk group (p < 0.0001). The pre-operative NLR seems to be an inexpensive and easily accessible prognostic bio-marker for non-metastatic RCCs.

27 October 2024 in Cells
Verified
Journal Article
Open access
PDF file
CKClément Klein
Clément Klein
SMSamy MEBROUKINE
Samy MEBROUKINE
MMMathilde Madéry
Mathilde Madéry
AMAlexandra Moisand
Alexandra Moisand
TBThomas Boyer
Thomas Boyer
CDCharlotte Domblides
Charlotte Domblides
Bladder cancer remains a prevalent and challenging malignancy. Myeloid-derived suppressor cells (MDSCs) have emerged as key contributors to the immunosuppressive tumor microenvironment, facilitating tumor progression, immune evasion, and resistance to therapies. This review explores the role of MDSC in bladder cancer, highlighting their involvement in immune regulation; tumor progression; and resistance to therapies such as bacillus Calmette–Guérin (BCG) therapy, chemotherapy, and immune checkpoint inhibitors (ICIs). We also discuss their potential as biomarkers and therapeutic targets, with current evidence suggesting that targeting MDSCs, either alone or in combination with existing treatments such as BCG and ICIs, may enhance anti-tumor immunity and improve clinical outcomes. However,, challenges remain, particularly regarding the identification and therapeutic modulation of MDSC subpopulations. Further research is warranted to fully elucidate their role in bladder cancer and to optimize MDSC-targeted therapies.

1 September 2023 in Minerva Urology and Nephrology
Verified
Journal Article
Closed access
CKClément Klein
Clément Klein
GCGrégoire Cazalas
Grégoire Cazalas
GMGaëlle Margue
Gaëlle Margue
GPGilles Piana
Gilles Piana
EKEric DE Kerviler
Eric DE Kerviler
JBJean-Christophe Bernhard
Jean-Christophe Bernhard
Article: Percutaneous tumor ablation versus image guided robotic-assisted partial nephrectomy for cT1b renal cell carcinoma: a comparative matched-pair analysis (UroCCR 80) - Minerva Urology and Nephrology 2023 October;75(5):559-68 - Minerva Medica - Journals

4 October 2022 in World Journal of Urology
Verified
Journal Article
Closed access
PDF file
MDMaxime Deslandes
Maxime Deslandes
CKClément Klein
Clément Klein
TMThibault Marquette
Thibault Marquette
VCVincent Comat
Vincent Comat
RMRichard Mallet
Richard Mallet
GRGrégoire Robert
Grégoire Robert

19 December 2024 in Diagnostics
Verified
Journal Article
Open access
PDF file
JPJules Pouchot
Jules Pouchot
CACrombé Amandine
Crombé Amandine
LBLuc Burlet
Luc Burlet
FFFadi Farah
Fadi Farah
PBPierre Baseilhac
Pierre Baseilhac
EJEva Jambon
Eva Jambon
Background/Objectives: This multicentric study aimed to evaluate the efficacy and safety of prostatic artery embolization (PAE) to remove indwelling urinary catheter (IUC) in patients with symptomatic benign prostatic hyperplasia (BPH). Secondary objectives were to identify features associated with post-PAE catheter-free survival (PCFS). Methods: All consecutive patients who underwent PAE for IUC related to BPH with a follow-up of at least 2 years (except for early death) in 6 French University Hospitals were retrospectively included. Clinical efficacy was defined as the removal of the IUC after PAE (through a trial without catheter [TWOC]) and evaluated at regular intervals. Chi-square tests, Wilcoxon tests and multivariable binary logistic regressions were utilized to investigate predictors of TWOC success. Univariable and multivariable Cox regressions were utilized to investigate predictors of PCFS in patients with TWOC success. Results: 140 men with IUC (median age: 82.5 years, interquartile range [IQR] = 73–88.2 years, range: 46–100) who underwent PAE between January 2017 and March 2021 were included. Initial successful catheter removal (TWOC success) following PAE occurred in 113/140 (80.7%) patients, and 3/140 (2.1%) patients encountered major complications. In patients with TWOC success, PCFS at 6 months, 1 year and 2 years were 87.5% (95%CI: 81.4–94.1), 84.4% (95%CI: 77.7–91.7) and 79% (71.3–87.4), respectively. No independent predictive factors for TWOC success and PCFS were identified. Conclusions: PAE should be considered as a safe option with good clinical efficacy in the short and long term for elderly and inoperable patients with IUC due to symptomatic BPH.

1 September 2023 in Minerva Urology and Nephrology
Verified
Journal Article
Closed access
CKClément Klein
Clément Klein
GMGaelle Margue
Gaelle Margue
CCCécile Champy
Cécile Champy
BPBastien Parier
Bastien Parier
TWThibaut Waeckel
Thibaut Waeckel
JBJean-Christophe Bernhard
Jean-Christophe Bernhard
Article: Can Simplified PADUA Renal (SPARE) Nephrometry scoring system help predict renal function outcomes after robot-assisted partial nephrectomy? (UroCCR study 93) - Minerva Urology and Nephrology 2023 October;75(5):569-76 - Minerva Medica - Journals