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Batochir C, Kim IA, Jo EJ, Kim EB, Kim HJ, Hur JY, Kim DW, Park HK, Lee KY. Discrimination of Lung Cancer and Benign Lung Diseases Using BALF Exosome DNA Methylation Profile. Cancers (Basel) 2024; 16:2765. [PMID: 39123492 PMCID: PMC11311347 DOI: 10.3390/cancers16152765] [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: 06/05/2024] [Revised: 07/15/2024] [Accepted: 07/31/2024] [Indexed: 08/12/2024] Open
Abstract
Benign lung diseases are common and often do not require specific treatment, but they pose challenges in the distinguishing of them from lung cancer during low-dose computed tomography (LDCT). This study presents a comprehensive methylation analysis using real-time PCR for minimally invasive diagnoses of lung cancer via employing BALF exosome DNA. A panel of seven epigenetic biomarkers was identified, exhibiting specific methylation patterns in lung cancer BALF exosome DNA. This panel achieved an area under the curve (AUC) of 0.97, with sensitivity and specificity rates of 88.24% and 97.14%, respectively. Each biomarker showed significantly higher mean methylation levels (MMLs) in both non-small cell lung cancer (NSCLC) and small cell lung cancer (SCLC) compared to non-cancer groups, with fold changes from 1.7 to 13.36. The MMLs of the biomarkers were found to be moderately elevated with increasing patient age and smoking history, regardless of sex. A strong correlation was found between the MMLs and NSCLC stage progression, with detection sensitivities of 79% for early stages and 92% for advanced stages. In the validation cohort, the model demonstrated an AUC of 0.95, with 94% sensitivity and specificity. Sensitivity for early-stage NSCLC detection improved from 88.00% to 92.00% when smoking history was included as an additional risk factor.
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Affiliation(s)
- Chinbayar Batochir
- Seasun Biomaterials, Inc., Daejeon 34015, Republic of Korea; (C.B.); (E.J.J.); (E.-B.K.); (D.W.K.); (H.K.P.)
| | - In Ae Kim
- Precision Medicine Lung Cancer Center, Konkuk University Medical Center, Seoul 05030, Republic of Korea; (I.A.K.); (H.J.K.); (J.Y.H.)
| | - Eun Ji Jo
- Seasun Biomaterials, Inc., Daejeon 34015, Republic of Korea; (C.B.); (E.J.J.); (E.-B.K.); (D.W.K.); (H.K.P.)
| | - Eun-Bi Kim
- Seasun Biomaterials, Inc., Daejeon 34015, Republic of Korea; (C.B.); (E.J.J.); (E.-B.K.); (D.W.K.); (H.K.P.)
| | - Hee Joung Kim
- Precision Medicine Lung Cancer Center, Konkuk University Medical Center, Seoul 05030, Republic of Korea; (I.A.K.); (H.J.K.); (J.Y.H.)
| | - Jae Young Hur
- Precision Medicine Lung Cancer Center, Konkuk University Medical Center, Seoul 05030, Republic of Korea; (I.A.K.); (H.J.K.); (J.Y.H.)
| | - Do Won Kim
- Seasun Biomaterials, Inc., Daejeon 34015, Republic of Korea; (C.B.); (E.J.J.); (E.-B.K.); (D.W.K.); (H.K.P.)
| | - Hee Kyung Park
- Seasun Biomaterials, Inc., Daejeon 34015, Republic of Korea; (C.B.); (E.J.J.); (E.-B.K.); (D.W.K.); (H.K.P.)
| | - Kye Young Lee
- Precision Medicine Lung Cancer Center, Konkuk University Medical Center, Seoul 05030, Republic of Korea; (I.A.K.); (H.J.K.); (J.Y.H.)
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Das D, Avssn R, Chittela RK. A phenol-chloroform free method for cfDNA isolation from cell conditioned media: development, optimization and comparative analysis. Anal Biochem 2024; 687:115454. [PMID: 38158107 DOI: 10.1016/j.ab.2023.115454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Revised: 12/13/2023] [Accepted: 12/26/2023] [Indexed: 01/03/2024]
Abstract
The non-invasive invasive nature of cell-free DNA (cfDNA) as diagnostic, prognostic, and theragnostic biomarkers has gained immense popularity in recent years. The clinical utility of cfDNA biomarkers may depend on understanding their origin and biological significance. Apoptosis, necrosis, and/or active release are possible mechanisms of cellular DNA release into the cell-free milieu. In-vitro cell culture models can provide useful insights into cfDNA biology. The yields and quality of cfDNA in the cell conditioned media (CCM) are largely dependent on the extraction method used. Here, we developed a phenol-chloroform-free cfDNA extraction method from CCM and compared it with three others published cfDNA extraction methods and four commercially available kits. Real-Time PCR (qPCR) targeting two different loci and a fluorescence-based Qubit assay were performed to quantify the extracted cfDNA. The absolute concentration of the extracted cfDNA varies with the target used for the qPCR assay; however, the relative trend remains similar for both qPCR assays. The cfDNA yield from CCM provided by the developed method was found to be either higher or comparable to the other methods used. In conclusion, we developed a safe, rapid and cost-effective cfDNA extraction protocol with minimal hands-on time; with no compromise in cfDNA yields.
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Affiliation(s)
- Dhruv Das
- Applied Genomics Section, Bioscience Group, Bhabha Atomic Research Centre, Mumbai, 400085, India; Homi Bhabha National Institute (HBNI), Anushaktinagar, Trombay, Mumbai, 400094, India
| | - Rao Avssn
- Applied Genomics Section, Bioscience Group, Bhabha Atomic Research Centre, Mumbai, 400085, India
| | - Rajani Kant Chittela
- Applied Genomics Section, Bioscience Group, Bhabha Atomic Research Centre, Mumbai, 400085, India; Homi Bhabha National Institute (HBNI), Anushaktinagar, Trombay, Mumbai, 400094, India.
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Kannampuzha S, Mukherjee AG, Wanjari UR, Gopalakrishnan AV, Murali R, Namachivayam A, Renu K, Dey A, Vellingiri B, Madhyastha H, Ganesan R. A Systematic Role of Metabolomics, Metabolic Pathways, and Chemical Metabolism in Lung Cancer. Vaccines (Basel) 2023; 11:vaccines11020381. [PMID: 36851259 PMCID: PMC9960365 DOI: 10.3390/vaccines11020381] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2023] [Revised: 01/31/2023] [Accepted: 02/06/2023] [Indexed: 02/11/2023] Open
Abstract
Lung cancer (LC) is considered as one of the leading causes of cancer-associated mortalities. Cancer cells' reprogrammed metabolism results in changes in metabolite concentrations, which can be utilized to identify a distinct metabolic pattern or fingerprint for cancer detection or diagnosis. By detecting different metabolic variations in the expression levels of LC patients, this will help and enhance early diagnosis methods as well as new treatment strategies. The majority of patients are identified at advanced stages after undergoing a number of surgical procedures or diagnostic testing, including the invasive procedures. This could be overcome by understanding the mechanism and function of differently regulated metabolites. Significant variations in the metabolites present in the different samples can be analyzed and used as early biomarkers. They could also be used to analyze the specific progression and type as well as stages of cancer type making it easier for the treatment process. The main aim of this review article is to focus on rewired metabolic pathways and the associated metabolite alterations that can be used as diagnostic and therapeutic targets in lung cancer diagnosis as well as treatment strategies.
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Affiliation(s)
- Sandra Kannampuzha
- Department of Biomedical Sciences, School of Biosciences and Technology, Vellore Institute of Technology (VIT), Vellore 632014, India
| | - Anirban Goutam Mukherjee
- Department of Biomedical Sciences, School of Biosciences and Technology, Vellore Institute of Technology (VIT), Vellore 632014, India
| | - Uddesh Ramesh Wanjari
- Department of Biomedical Sciences, School of Biosciences and Technology, Vellore Institute of Technology (VIT), Vellore 632014, India
| | - Abilash Valsala Gopalakrishnan
- Department of Biomedical Sciences, School of Biosciences and Technology, Vellore Institute of Technology (VIT), Vellore 632014, India
- Correspondence: (A.V.G.); (R.G.)
| | - Reshma Murali
- Department of Biomedical Sciences, School of Biosciences and Technology, Vellore Institute of Technology (VIT), Vellore 632014, India
| | - Arunraj Namachivayam
- Department of Biomedical Sciences, School of Biosciences and Technology, Vellore Institute of Technology (VIT), Vellore 632014, India
| | - Kaviyarasi Renu
- Centre of Molecular Medicine and Diagnostics (COMManD), Department of Biochemistry, Saveetha Dental College & Hospitals, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai 600077, India
| | - Abhijit Dey
- Department of Life Sciences, Presidency University, Kolkata 700073, India
| | - Balachandar Vellingiri
- Stem Cell and Regenerative Medicine/Translational Research, Department of Zoology, School of Basic Sciences, Central University of Punjab (CUPB), Bathinda 151401, India
| | - Harishkumar Madhyastha
- Department of Cardiovascular Physiology, Faculty of Medicine, University of Miyazaki, Miyazaki 889-1692, Japan
| | - Raja Ganesan
- Institute for Liver and Digestive Diseases, College of Medicine, Hallym University, Chuncheon 24252, Republic of Korea
- Correspondence: (A.V.G.); (R.G.)
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Lin X, Cai Y, Zong C, Chen B, Shao D, Cui H, Li Z, Xu P. Bronchoalveolar Lavage as Potential Diagnostic Specimens to Genetic Testing in Advanced Nonsmall Cell Lung Cancer. Technol Cancer Res Treat 2023; 22:15330338231202881. [PMID: 37743841 PMCID: PMC10521282 DOI: 10.1177/15330338231202881] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Revised: 07/24/2023] [Accepted: 08/22/2023] [Indexed: 09/26/2023] Open
Abstract
Background: There is limited knowledge on the yield of performing capture-based targeted ultradeep sequencing on bronchoalveolar lavage (BAL) specimens from advanced nonsmall cell lung cancer (NSCLC) patients. This study aimed to evaluate gene variations and performance characteristics in BAL and tissue specimens using targeted sequencing. Methods: This cohort study retrospectively enrolled 20 patients with advanced NSCLC. The variant detection percentage, correlation of tumor mutation burden (TMB), and allele frequency heterogeneity (AFH) were compared between paired BAL and tissue samples. A three-tiered system was also applied for the interpretation of gene variants according to the guidelines. Results: No statistical difference was observed in variant detection between BAL and tissue samples (P = .591 for variant tier and P = .409 for variant type). In general, BAL achieved higher detection rates in tier I variants (96.2% vs 84.6%) and gene fusions (75% vs 50%) compared with tissue samples; tissue samples had better variants detection rates for other variants, such as tier II (89.6% vs 76.0%), tier III (87.1% vs 72.6%), single nucleotide variant (SNV, 89.6% vs 76.5%), insertion/deletion/duplication (InDel, 74.6% vs 69.8%) and copy number variation (CNV, 93.8% vs 43.8%). Besides, there were significant correlations of TMB (R2 = 0.96, P < .001) and AFH (R2 = 0.87, P < .001) between BALs and paired tissues. Conclusions: The findings demonstrate that BAL may serve as a supplement in liquid biopsy for mutation detection and for routine utilization in clinical settings.
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Affiliation(s)
- Xuwen Lin
- Respiratory Department, Peking University Shenzhen Hospital, Shenzhen, China
| | - Yazhou Cai
- Respiratory Department, Peking University Shenzhen Hospital, Shenzhen, China
| | - Chenyu Zong
- Respiratory Department, Peking University Shenzhen Hospital, Shenzhen, China
| | | | - Di Shao
- BGI Genomics, BGI-Shenzhen, Shenzhen, China
| | - Hao Cui
- Zhuhai Maternal and Child Health Hospital, Zhuhai, China
| | - Zheng Li
- NHC Key Laboratory of Carcinogenesis, Hunan Cancer Hospital and the Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, China
| | - Ping Xu
- Respiratory Department, Peking University Shenzhen Hospital, Shenzhen, China
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Nair VS, Hui ABY, Chabon JJ, Esfahani MS, Stehr H, Nabet BY, Zhou L, Chaudhuri AA, Benson J, Ayers K, Bedi H, Ramsey M, Van Wert R, Antic S, Lui N, Backhus L, Berry M, Sung AW, Massion PP, Shrager JB, Alizadeh AA, Diehn M. Genomic Profiling of Bronchoalveolar Lavage Fluid in Lung Cancer. Cancer Res 2022; 82:2838-2847. [PMID: 35748739 PMCID: PMC9379362 DOI: 10.1158/0008-5472.can-22-0554] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Revised: 05/24/2022] [Accepted: 06/14/2022] [Indexed: 11/16/2022]
Abstract
Genomic profiling of bronchoalveolar lavage (BAL) samples may be useful for tumor profiling and diagnosis in the clinic. Here, we compared tumor-derived mutations detected in BAL samples from subjects with non-small cell lung cancer (NSCLC) to those detected in matched plasma samples. Cancer Personalized Profiling by Deep Sequencing (CAPP-Seq) was used to genotype DNA purified from BAL, plasma, and tumor samples from patients with NSCLC. The characteristics of cell-free DNA (cfDNA) isolated from BAL fluid were first characterized to optimize the technical approach. Somatic mutations identified in tumor were then compared with those identified in BAL and plasma, and the potential of BAL cfDNA analysis to distinguish lung cancer patients from risk-matched controls was explored. In total, 200 biofluid and tumor samples from 38 cases and 21 controls undergoing BAL for lung cancer evaluation were profiled. More tumor variants were identified in BAL cfDNA than plasma cfDNA in all stages (P < 0.001) and in stage I to II disease only. Four of 21 controls harbored low levels of cancer-associated driver mutations in BAL cfDNA [mean variant allele frequency (VAF) = 0.5%], suggesting the presence of somatic mutations in nonmalignant airway cells. Finally, using a Random Forest model with leave-one-out cross-validation, an exploratory BAL genomic classifier identified lung cancer with 69% sensitivity and 100% specificity in this cohort and detected more cancers than BAL cytology. Detecting tumor-derived mutations by targeted sequencing of BAL cfDNA is technically feasible and appears to be more sensitive than plasma profiling. Further studies are required to define optimal diagnostic applications and clinical utility. SIGNIFICANCE Hybrid-capture, targeted deep sequencing of lung cancer mutational burden in cell-free BAL fluid identifies more tumor-derived mutations with increased allele frequencies compared with plasma cell-free DNA. See related commentary by Rolfo et al., p. 2826.
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Affiliation(s)
- Viswam S. Nair
- Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, Washington
- Division of Pulmonary, Critical Care & Sleep Medicine, University of Washington School of Medicine, Seattle, Washington
- Department of Radiology, Stanford University School of Medicine, Stanford, California
| | - Angela Bik-Yu Hui
- Stanford Cancer Institute, Stanford University School of Medicine, Stanford, California
| | - Jacob J. Chabon
- Stanford Cancer Institute, Stanford University School of Medicine, Stanford, California
| | - Mohammad S. Esfahani
- Stanford Cancer Institute, Stanford University School of Medicine, Stanford, California
| | - Henning Stehr
- Department of Pathology, Stanford University School of Medicine, Stanford, California
| | - Barzin Y. Nabet
- Stanford Cancer Institute, Stanford University School of Medicine, Stanford, California
| | - Li Zhou
- Stanford Cancer Institute, Stanford University School of Medicine, Stanford, California
| | - Aadel A. Chaudhuri
- Department of Radiation Oncology, Stanford University School of Medicine, Stanford, California
| | - Jalen Benson
- Division of Thoracic Surgery, Stanford University School of Medicine, Stanford, California
| | - Kelsey Ayers
- Division of Thoracic Surgery, Stanford University School of Medicine, Stanford, California
| | - Harmeet Bedi
- Division of Pulmonary, Allergy & Critical Care Medicine, Stanford University School of Medicine, Stanford, California
| | - Meghan Ramsey
- Division of Pulmonary, Allergy & Critical Care Medicine, Stanford University School of Medicine, Stanford, California
| | - Ryan Van Wert
- Division of Pulmonary, Allergy & Critical Care Medicine, Stanford University School of Medicine, Stanford, California
| | - Sanja Antic
- Division of Allergy, Pulmonary & Critical Care Medicine, Vanderbilt University School of Medicine, Nashville, Tennessee
| | - Natalie Lui
- Division of Thoracic Surgery, Stanford University School of Medicine, Stanford, California
| | - Leah Backhus
- Division of Thoracic Surgery, Stanford University School of Medicine, Stanford, California
| | - Mark Berry
- Division of Thoracic Surgery, Stanford University School of Medicine, Stanford, California
| | - Arthur W. Sung
- Division of Pulmonary, Allergy & Critical Care Medicine, Stanford University School of Medicine, Stanford, California
| | - Pierre P. Massion
- Division of Allergy, Pulmonary & Critical Care Medicine, Vanderbilt University School of Medicine, Nashville, Tennessee
| | - Joseph B. Shrager
- Division of Thoracic Surgery, Stanford University School of Medicine, Stanford, California
| | - Ash A. Alizadeh
- Stanford Cancer Institute, Stanford University School of Medicine, Stanford, California
- Division of Oncology, Department of Medicine, Stanford University School of Medicine, Stanford, California
- Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, California
| | - Maximilian Diehn
- Stanford Cancer Institute, Stanford University School of Medicine, Stanford, California
- Department of Radiation Oncology, Stanford University School of Medicine, Stanford, California
- Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, California
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Lin F, Hu X, Zhang Y, Ye S, Gu Y, Yan B, Wang L, Jiang Y. Upregulated TIGIT+ and Helios+ regulatory T cell levels in bronchoalveolar lavage fluid of NSCLC patients. Mol Immunol 2022; 147:40-49. [DOI: 10.1016/j.molimm.2022.04.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2021] [Revised: 03/17/2022] [Accepted: 04/17/2022] [Indexed: 12/09/2022]
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Wen SWC, Wen J, Hansen TF, Jakobsen A, Hilberg O. Cell Free Methylated Tumor DNA in Bronchial Lavage as an Additional Tool for Diagnosing Lung Cancer-A Systematic Review. Cancers (Basel) 2022; 14:2254. [PMID: 35565384 PMCID: PMC9099950 DOI: 10.3390/cancers14092254] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 04/28/2022] [Accepted: 04/28/2022] [Indexed: 11/17/2022] Open
Abstract
This systematic review investigated circulating methylated tumor DNA in bronchial lavage fluid for diagnosing lung cancer. PROSPERO registration CRD42022309470. PubMed, Embase, Medline, and Web of Science were searched on 9 March 2022. Studies of adults with lung cancer or undergoing diagnostic workup for suspected lung cancer were included if they used bronchial lavage fluid, analyzed methylated circulating tumor DNA, and reported the diagnostic properties. Sensitivity, specificity, and lung cancer prevalence were summarized in forest plots. Risk of bias was assessed using the QUADAS-2 tool. A total of 25 studies were included. All were case-control studies, most studies used cell pellet for analysis by quantitative PCR. Diagnostic sensitivity ranged from 0% for a single gene to 97% for a four-gene panel. Specificity ranged from 8% for a single gene to 100%. The studies employing a gene panel decreased the specificity, and no gene panel had a perfect specificity of 100%. In conclusion, methylated circulating tumor DNA can be detected in bronchial lavage, and by employing a gene panel the sensitivity can be increased to clinically relevant levels. The available evidence regarding applicability in routine clinical practice is limited. Prospective, randomized clinical trials are needed to determine the further usefulness of this biomarker.
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Affiliation(s)
- Sara Witting Christensen Wen
- Department of Oncology, Vejle Hospital, University Hospital of Southern Denmark, Beriderbakken 4, 7100 Vejle, Denmark; (T.F.H.); (A.J.)
- Department of Regional Health Research, J.B. Winsloews Vej 19, 3rd Floor, 5000 Odense C, Denmark;
| | - Jan Wen
- General Practice, Region of Southern Denmark, Damhaven 12, 7100 Vejle, Denmark;
| | - Torben Frøstrup Hansen
- Department of Oncology, Vejle Hospital, University Hospital of Southern Denmark, Beriderbakken 4, 7100 Vejle, Denmark; (T.F.H.); (A.J.)
- Department of Regional Health Research, J.B. Winsloews Vej 19, 3rd Floor, 5000 Odense C, Denmark;
| | - Anders Jakobsen
- Department of Oncology, Vejle Hospital, University Hospital of Southern Denmark, Beriderbakken 4, 7100 Vejle, Denmark; (T.F.H.); (A.J.)
- Department of Regional Health Research, J.B. Winsloews Vej 19, 3rd Floor, 5000 Odense C, Denmark;
| | - Ole Hilberg
- Department of Regional Health Research, J.B. Winsloews Vej 19, 3rd Floor, 5000 Odense C, Denmark;
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Keup C, Kimmig R, Kasimir-Bauer S. Combinatorial Power of cfDNA, CTCs and EVs in Oncology. Diagnostics (Basel) 2022; 12:870. [PMID: 35453918 PMCID: PMC9031112 DOI: 10.3390/diagnostics12040870] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Revised: 03/18/2022] [Accepted: 03/28/2022] [Indexed: 01/01/2023] Open
Abstract
Liquid biopsy is a promising technique for clinical management of oncological patients. The diversity of analytes circulating in the blood useable for liquid biopsy testing is enormous. Circulating tumor cells (CTCs), cell-free DNA (cfDNA) and extracellular vesicles (EVs), as well as blood cells and other soluble components in the plasma, were shown as liquid biopsy analytes. A few studies directly comparing two liquid biopsy analytes showed a benefit of one analyte over the other, while most authors concluded the benefit of the additional analyte. Only three years ago, the first studies to examine the value of a characterization of more than two liquid biopsy analytes from the same sample were conducted. We attempt to reflect on the recent development of multimodal liquid biopsy testing in this review. Although the analytes and clinical purposes of the published multimodal studies differed significantly, the additive value of the analytes was concluded in almost all projects. Thus, the blood components, as liquid biopsy reservoirs, are complementary rather than competitive, and orthogonal data sets were even shown to harbor synergistic effects. The unmistakable potential of multimodal liquid biopsy testing, however, is dampened by its clinical utility, which is yet to be proven, the lack of methodical standardization and insufficiently mature reimbursement, logistics and data handling.
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Affiliation(s)
- Corinna Keup
- Department of Gynecology and Obstetrics, University Hospital of Essen, Hufelandstr. 55, 45122 Essen, Germany
| | - Rainer Kimmig
- Department of Gynecology and Obstetrics, University Hospital of Essen, Hufelandstr. 55, 45122 Essen, Germany
| | - Sabine Kasimir-Bauer
- Department of Gynecology and Obstetrics, University Hospital of Essen, Hufelandstr. 55, 45122 Essen, Germany
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