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Angeles MA, Migliorelli F, León Ramírez LF, Ros C, Perissinotti A, Tapias A, Casanueva-Eliceiry S, Pahisa J, Torné A, Vidal-Sicart S, Del Pino M, Paredes P. Predictive factors of preoperative sentinel lymph node detection in intermediate and high-risk endometrial cancer. Q J Nucl Med Mol Imaging 2023; 67:37-45. [PMID: 32077670 DOI: 10.23736/s1824-4785.20.03246-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
BACKGROUND In endometrial cancer (EC), sentinel lymph node (SLN) mapping has emerged as an alternative to systematic lymphadenectomy. Little is known about factors that might influence SLN preoperative detection. The aim of our study was to evaluate the clinical and technical variables that may influence on the success of SLN detection in preoperative lymphatic mapping in patients with intermediate and high-risk EC when performing transvaginal ultrasound-guided myometrial injection of radiotracer (TUMIR). METHODS Between March 2006 and March 2017, we prospectively enrolled patients with histologically confirmed EC with intermediate or high-risk of lymphatic involvement. All women underwent SLN detection by using TUMIR approach. After radiotracer injection, pelvic and abdominal planar and SPECT/CT images were acquired to obtain a preoperative lymphoscintigraphic mapping. Pattern of drainage was registered and analyzed to identify the factors directly involved in drainage. Sonographer learning curves to perform TUMIR approach were created following Cumulative Sum and Wright methods. Univariate and multivariate analyses were performed using logistic regression. RESULTS During study period, 123 patients were included. SLN preoperative detection rate was 70.7%. Age under 75 years at diagnosis (P<0.01), radiotracer injection above 4 mL -high-volume- (P<0.01), and tumoral size below 2 cm (P=0.04) were associated with higher SLN preoperative detection rate. Twenty-five procedures were necessary to attain an adequate performance in TUMIR approach. CONCLUSIONS The higher SLN preoperative detection rate in women with intermediate and high-risk endometrial cancer after TUMIR approach was related with younger age, smaller tumors and high-volume injection of radiotracer. Sonographers are required to perform 25 procedures before acquiring an expertise in radiotracer injection.
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Affiliation(s)
- Martina A Angeles
- Institute Clinic of Gynecology, Obstetrics, and Neonatology, Clinical Hospital of Barcelona, Barcelona, Spain - .,Department of Surgical Oncology, Claudius Regaud Institute, Cancer University Institute of Toulouse - Oncopole, Toulouse, France -
| | - Federico Migliorelli
- Department of Gynecology and Obstetrics, Centre Hospitalier Intercommunal des Vallées de l'Ariège, St Jean de Verges, France
| | | | - Cristina Ros
- Institute Clinic of Gynecology, Obstetrics, and Neonatology, Clinical Hospital of Barcelona, Barcelona, Spain
| | - Andrés Perissinotti
- Department of Nuclear Medicine, Clinical Hospital of Barcelona, Barcelona, Spain.,Biomedical Research Networking Center in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Barcelona, Spain
| | - Andrés Tapias
- Department of Nuclear Medicine, Clinical Hospital of Barcelona, Barcelona, Spain
| | | | - Jaume Pahisa
- Institute Clinic of Gynecology, Obstetrics, and Neonatology, Clinical Hospital of Barcelona, Barcelona, Spain.,Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Faculty of Medicine, University of Barcelona, Barcelona, Spain
| | - Aureli Torné
- Institute Clinic of Gynecology, Obstetrics, and Neonatology, Clinical Hospital of Barcelona, Barcelona, Spain.,Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Faculty of Medicine, University of Barcelona, Barcelona, Spain
| | - Sergi Vidal-Sicart
- Department of Nuclear Medicine, Clinical Hospital of Barcelona, Barcelona, Spain.,Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Faculty of Medicine, University of Barcelona, Barcelona, Spain
| | - Marta Del Pino
- Institute Clinic of Gynecology, Obstetrics, and Neonatology, Clinical Hospital of Barcelona, Barcelona, Spain.,Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Faculty of Medicine, University of Barcelona, Barcelona, Spain
| | - Pilar Paredes
- Department of Nuclear Medicine, Clinical Hospital of Barcelona, Barcelona, Spain.,Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Faculty of Medicine, University of Barcelona, Barcelona, Spain
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2
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Mayoral M, Paredes P, Saco A, Fusté P, Perlaza P, Tapias A, Fernandez-Martinez A, Vidal L, Ordi J, Pavia J, Martinez-Roman S, Lomeña F. Correlación de la captación de 18 F-FDG de la PET/TC con el Ki67 de la inmunohistoquímica en el cáncer epitelial de ovario pretratamiento. Rev Esp Med Nucl Imagen Mol 2018. [DOI: 10.1016/j.remnie.2017.10.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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3
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Tapias A, Sánchez N, Torregrosa JV, Fuster D, Perlaza P, Lomeña F. Triple functioning renal allograft after repeated liver-kidney transplantation due to liver failure. Nefrologia 2018; 38:667-669. [PMID: 29395360 DOI: 10.1016/j.nefro.2017.11.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Revised: 10/30/2017] [Accepted: 11/09/2017] [Indexed: 10/18/2022] Open
Affiliation(s)
- Andrés Tapias
- Nuclear Medicine Department, Hospital Clinic, Barcelona, Spain
| | - Nuria Sánchez
- Nuclear Medicine Department, Hospital Clinic, Barcelona, Spain
| | - José V Torregrosa
- Nephrology and Renal Transplant Department, Hospital Clinic, Barcelona, Spain
| | - David Fuster
- Nuclear Medicine Department, Hospital Clinic, Barcelona, Spain.
| | - Pilar Perlaza
- Nuclear Medicine Department, Hospital Clinic, Barcelona, Spain
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4
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Sánchez N, Tapias A, Bowles H, Delgado E, Almenara R, Fuster D, Vidal-Sicart S. Multimodal approach in radioguided surgery in a case of multiple paraganglioma. ACTA ACUST UNITED AC 2018. [DOI: 10.1016/j.remnie.2017.10.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Coloma A, Sánchez N, Fuster D, Ruiz C, Xipell M, Orozco J, Tapias A, Torregrosa JV. Complex regional pain syndrome associated with erythropoietin therapy. Nefrologia 2017; 38:99-101. [PMID: 29203063 DOI: 10.1016/j.nefro.2017.01.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2016] [Revised: 12/15/2016] [Accepted: 01/13/2017] [Indexed: 11/18/2022] Open
Affiliation(s)
- Ana Coloma
- Unidad de Trasplante Renal, Hospital Clínic, Barcelona, España
| | - Nuria Sánchez
- Departamento de Medicina Nuclear, Hospital Clínic, Barcelona, España.
| | - David Fuster
- Departamento de Medicina Nuclear, Hospital Clínic, Barcelona, España
| | - Cristina Ruiz
- Departamento de Medicina Nuclear, Hospital Clínic, Barcelona, España
| | - Marc Xipell
- Departamento de Nefrología, Hospital Clínic, Barcelona, España
| | - John Orozco
- Departamento de Medicina Nuclear, Hospital Clínic, Barcelona, España
| | - Andrés Tapias
- Departamento de Medicina Nuclear, Hospital Clínic, Barcelona, España
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6
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Mayoral M, Paredes P, Saco A, Fusté P, Perlaza P, Tapias A, Fernandez-Martinez A, Vidal L, Ordi J, Pavia J, Martinez-Roman S, Lomeña F. Correlation of 18F-FDG uptake on PET/CT with Ki67 immunohistochemistry in pre-treatment epithelial ovarian cancer. Rev Esp Med Nucl Imagen Mol 2017; 37:80-86. [PMID: 28869177 DOI: 10.1016/j.remn.2017.07.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2017] [Revised: 06/18/2017] [Accepted: 07/09/2017] [Indexed: 01/10/2023]
Abstract
OBJECTIVE Standardised uptake value (SUV) and volumetric parameters such as metabolic tumour volume (MTV) and total lesion glycolysis (TLG) from 18F-FDG PET/CT are useful criteria for disease prognosis in pre-operative and post-treatment epithelial ovarian cancer (EOC). Ki67 is another prognostic biomarker in EOC, associated with tumour aggressiveness. The aim of this study is to evaluate the association between 18F-FDG PET/CT measurements and Ki67 in pre-treatment EOC to determine if PET/CT parameters could non-invasively predict tumour aggressiveness. MATERIAL AND METHODS A pre-treatment PET/CT was performed on 18 patients with suspected or newly diagnosed EOC. Maximum SUV (SUVmax), mean SUV (SUVmean), whole-body MTV (wbMTV), and whole-body TLG (wbTLG) with a threshold of 30% and 40% of the SUVmax were obtained. Furthermore, Ki67 index (mean and hotspot) was estimated in tumour tissue specimens. Immunohistochemical findings were correlated with PET parameters. RESULTS The mean age was 57.0 years old (standard deviation 13.6 years). A moderate correlation was observed between mean Ki67 index and SUVmax (r=0.392), SUVmean 30% (r=0.437), and SUVmean 40% (r=0.443), and also between hotspot Ki67 index and SUVmax (r=0.360), SUVmean 30% (r=0.362) and SUVmean 40% (r=0.319). There was a weaker correlation, which was inversely negative, between mean and hotspot Ki67 and volumetric PET parameters. However, no statistical significant differences were found for any correlations. CONCLUSIONS SUVmax and SUVmean were moderately correlated with Ki67 index, whereas volumetric PET parameters overall, showed a weaker correlation. Thus, SUVmax and SUVmean could be used to assess tumour aggressiveness in pre-treatment EOC.
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Affiliation(s)
- M Mayoral
- Nuclear Medicine Department, Hospital Clínic, Barcelona, Spain
| | - P Paredes
- Nuclear Medicine Department, Hospital Clínic, Barcelona, Spain; Institut D'Investigacions Biomèdiques August Pi I Sunyer (IDIBAPS), Barcelona, Spain.
| | - A Saco
- Department of Pathology, Hospital Clínic, Barcelona, Spain
| | - P Fusté
- Gynaecology Department, Hospital Clínic, Barcelona, Spain
| | - P Perlaza
- Nuclear Medicine Department, Hospital Clínic, Barcelona, Spain
| | - A Tapias
- Nuclear Medicine Department, Hospital Clínic, Barcelona, Spain
| | | | - L Vidal
- Medical Oncology Department, Hospital Clínic, Barcelona, Spain
| | - J Ordi
- Department of Pathology, Hospital Clínic, Barcelona, Spain; Centre de Recerca en Salut Internacional de Barcelona (CRESIB), Barcelona, Spain
| | - J Pavia
- Nuclear Medicine Department, Hospital Clínic, Barcelona, Spain; Institut D'Investigacions Biomèdiques August Pi I Sunyer (IDIBAPS), Barcelona, Spain; CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Barcelona, Spain
| | - S Martinez-Roman
- Institut D'Investigacions Biomèdiques August Pi I Sunyer (IDIBAPS), Barcelona, Spain; Gynaecology Department, Hospital Clínic, Barcelona, Spain
| | - F Lomeña
- Nuclear Medicine Department, Hospital Clínic, Barcelona, Spain; Institut D'Investigacions Biomèdiques August Pi I Sunyer (IDIBAPS), Barcelona, Spain
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Sánchez N, Tapias A, Bowles H, Delgado E, Almenara R, Fuster D, Vidal-Sicart S. Multimodal approach in radioguided surgery in a case of multiple paraganglioma. Rev Esp Med Nucl Imagen Mol 2017; 37:41-45. [PMID: 28566259 DOI: 10.1016/j.remn.2017.04.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2017] [Revised: 04/17/2017] [Accepted: 04/19/2017] [Indexed: 11/25/2022]
Abstract
The case involves a 34-year-old woman who underwent surgical removal of a retroperitoneal paraganglioma adjacent to the left kidney's lower pole, previously visualized by CT and MRI. The 123I-MIBG scan was positive for this lesion and, in addition, another uptake was observed located caudally at the level of L5 and of smaller size and less intensity. The second lesion was not considered for surgical removal, due to its lack of morphological definition. One week after surgical intervention, the patient presented difficult-to-control high blood pressure. A second 123I-MIBG scan was performed. The previously described second image was more intense in this study, and surgery was planned to remove it. A combination of techniques including freehand-SPECT and a portable hybrid gamma camera (with optical camera) were used pre-operatively to identify the location of the lesion. The combination of intra-operative laparoscopic gamma probe and portable hybrid gamma camera enabled the tumor to be located, excised, and its complete removal to be monitored. The histopathology analysis confirmed a second paraganglioma.
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Affiliation(s)
- N Sánchez
- Departamento de Medicina Nuclear, Hospital Clínic, Barcelona, España.
| | - A Tapias
- Departamento de Medicina Nuclear, Hospital Clínic, Barcelona, España
| | - H Bowles
- Departamento de Medicina Nuclear, Hospital Clínic, Barcelona, España
| | - E Delgado
- Departamento de Cirugía Gastrointestinal, Hospital Clínic, Barcelona, España
| | - R Almenara
- Departamento de Cirugía Gastrointestinal, Hospital Clínic, Barcelona, España
| | - D Fuster
- Departamento de Medicina Nuclear, Hospital Clínic, Barcelona, España
| | - S Vidal-Sicart
- Departamento de Medicina Nuclear, Hospital Clínic, Barcelona, España
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8
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Bowles H, Sánchez N, Tapias A, Paredes P, Campos F, Bluemel C, Valdés Olmos R, Vidal-Sicart S. Radioguided surgery and the GOSTT concept: From pre-operative image and intraoperative navigation to image-assisted excision. ACTA ACUST UNITED AC 2017. [DOI: 10.1016/j.remnie.2017.02.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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9
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Mayoral M, Paredes P, Domènech B, Fusté P, Vidal-Sicart S, Tapias A, Torné A, Pahisa J, Ordi J, Pons F, Lomeña F. 18F-FDG PET/CT and sentinel lymph node biopsy in the staging of patients with cervical and endometrial cancer. Role of dual-time-point imaging. Rev Esp Med Nucl Imagen Mol 2017. [DOI: 10.1016/j.remnie.2016.07.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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10
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Bowles H, Sánchez N, Tapias A, Paredes P, Campos F, Bluemel C, Valdés Olmos RA, Vidal-Sicart S. Radioguided surgery and the GOSTT concept: From pre-operative image and intraoperative navigation to image-assisted excision. Rev Esp Med Nucl Imagen Mol 2016; 36:175-184. [PMID: 27793632 DOI: 10.1016/j.remn.2016.09.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2016] [Revised: 09/11/2016] [Accepted: 09/13/2016] [Indexed: 10/20/2022]
Abstract
Radio-guided surgery has been developed for application in those disease scheduled for surgical management, particularly in areas of complex anatomy. This is based on the use of pre-operative scintigraphic planar, tomographic and fused SPECT/CT images, and the possibility of 3D reconstruction for the subsequent intraoperative locating of active lesions using handheld devices (detection probes, gamma cameras, etc.). New tracers and technologies have also been incorporated into these surgical procedures. The combination of visual and acoustic signals during the intraoperative procedure has become possible with new portable imaging modalities. In daily practice, the images offered by these techniques and devices combine perioperative nuclear medicine imaging with the superior resolution of additional optical guidance in the operating room. In many ways they provide real-time images, allowing accurate guidance during surgery, a reduction in the time required for tissue location and an anatomical environment for surgical recognition. All these approaches have been included in the concept known as (radio) Guided intraOperative Scintigraphic Tumour Targeting (GOSTT). This article offers a general view of different nuclear medicine and allied technologies used for several GOSTT procedures, and illustrates the crossing of technological frontiers in radio-guided surgery.
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Affiliation(s)
- H Bowles
- Department of Nuclear Medicine, University Hospital Clínic Barcelona, Barcelona, Spain
| | - N Sánchez
- Department of Nuclear Medicine, University Hospital Clínic Barcelona, Barcelona, Spain
| | - A Tapias
- Department of Nuclear Medicine, University Hospital Clínic Barcelona, Barcelona, Spain
| | - P Paredes
- Department of Nuclear Medicine, University Hospital Clínic Barcelona, Barcelona, Spain; Institut d'Investigacions Biomèdiques Agustí Pi i Sunyer (IDIBAPS), Barcelona, Spain
| | - F Campos
- Department of Nuclear Medicine, University Hospital Clínic Barcelona, Barcelona, Spain; Institut d'Investigacions Biomèdiques Agustí Pi i Sunyer (IDIBAPS), Barcelona, Spain
| | - C Bluemel
- Department of Nuclear Medicine, University Hospital of Wurzburg, Wurzburg, Germany
| | - R A Valdés Olmos
- Interventional Molecular Imaging Laboratory and Nuclear Medicine Section, Department of Radiology, Leiden University Medical Center, Leiden, The Netherlands; Department of Nuclear Medicine, The Netherlands Cancer Institute - Antoni van Leeuwenhoek Hospital, Amsterdam, The Netherlands
| | - S Vidal-Sicart
- Department of Nuclear Medicine, University Hospital Clínic Barcelona, Barcelona, Spain; Institut d'Investigacions Biomèdiques Agustí Pi i Sunyer (IDIBAPS), Barcelona, Spain.
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11
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Mayoral M, Paredes P, Domènech B, Fusté P, Vidal-Sicart S, Tapias A, Torné A, Pahisa J, Ordi J, Pons F, Lomeña F. 18F-FDG PET/CT and sentinel lymph node biopsy in the staging of patients with cervical and endometrial cancer. Role of dual-time-point imaging. Rev Esp Med Nucl Imagen Mol 2016; 36:20-26. [PMID: 27667001 DOI: 10.1016/j.remn.2016.07.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2016] [Revised: 06/10/2016] [Accepted: 07/04/2016] [Indexed: 10/21/2022]
Abstract
OBJECTIVE Definitive staging for cervical (CC) and endometrial cancer (EC) takes place once surgery is performed. The aim of this study was to evaluate the role of PET/CT in detecting lymphatic metastasis in patients with CC and EC using dual-time-point imaging (DPI), taking the histopathological results of sentinel lymph node (SLN) and lymphadenectomy as the reference. MATERIAL AND METHODS A prospective study was conducted on 17 patients with early CC, and 13 patients with high-risk EC. The patients had a pre-operative PET/CT, MRI, SLN detection, and lymphadenectomy, when indicated. PET/CT findings were compared with histopathological results. RESULTS In the pathology study, 4 patients with CC and 4 patients with EC had lymphatic metastasis. PET/CT showed hypermetabolic nodes in 1 patient with CC, and 5 with EC. Four of these had metastasis, one detected in the SLN biopsy. Four patients who had negative PET/CT had micrometastasis in the SLN biopsy, 1 patient with additional lymph nodes involvement. The overall patient-based sensitivity, specificity, positive and negative predictive values, and accuracy of PET/CT to detect lymphatic metastasis was 20.0%, 100.0%, 100.0%, 87.9%, and 88.2%, respectively, in CC, and 57.1%, 88.9%, 66.7%, 84.2% and 80.0%, respectively, in EC. DPI showed higher retention index in malignant than in inflammatory nodes, although no statistically significant differences were found. CONCLUSIONS PET/CT has low sensitivity in lymph node staging of CC and EC, owing to the lack of detection of micrometastasis. Thus, PET/CT cannot replace SLN biopsy. Although no statistically significant differences were found, DPI may help to differentiate between inflammatory and malignant nodes.
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Affiliation(s)
- M Mayoral
- Nuclear Medicine Department, Hospital Clínic, Barcelona, Spain.
| | - P Paredes
- Nuclear Medicine Department, Hospital Clínic, Barcelona, Spain; Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain
| | - B Domènech
- Nuclear Medicine Department, Hospital Clínic, Barcelona, Spain
| | - P Fusté
- Clinic Institute of Gynaecology, Obstetrics and Neonatology, Hospital Clinic, Barcelona, Spain
| | - S Vidal-Sicart
- Nuclear Medicine Department, Hospital Clínic, Barcelona, Spain; Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain
| | - A Tapias
- Nuclear Medicine Department, Hospital Clínic, Barcelona, Spain
| | - A Torné
- Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain; Clinic Institute of Gynaecology, Obstetrics and Neonatology, Hospital Clinic, Barcelona, Spain
| | - J Pahisa
- Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain; Clinic Institute of Gynaecology, Obstetrics and Neonatology, Hospital Clinic, Barcelona, Spain
| | - J Ordi
- Pathology Department, Hospital Clinic, Barcelona, Spain; CRESIB (Centre de Recerca en Salut Internacional de Barcelona), Hospital Clinic, Barcelona, Spain
| | - F Pons
- Nuclear Medicine Department, Hospital Clínic, Barcelona, Spain; Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain
| | - F Lomeña
- Nuclear Medicine Department, Hospital Clínic, Barcelona, Spain; Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain
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Abstract
The regulation of the Rhodobacter sphaeroides lexA gene has been analyzed using both gel-mobility experiments and lacZ gene fusions. PCR-mediated mutagenesis demonstrated that the second GAAC motif in the sequence GAACN7GAACN7GAAC located upstream of the R. sphaeroides lexA gene is absolutely necessary for its DNA damage-mediated induction. Moreover, mutagenesis of either the first or the third GAAC motif in this sequence reduced, but did not abolish, the inducibility of the R. sphaeroides lexA gene. A R. sphaeroides lexA-defective (Def) mutant has also been constructed by replacing the active lexA gene with an inactivated gene copy constructed in vitro. Crude extracts of the R. sphaeroides lexA(Def) strain are unable to form any protein-DNA complex when added to the wild-type lexA promoter of R. sphaeroides. Likewise, the R. sphaeroides lexA(Def) cells constitutively express the recA and lexA genes. All these data clearly indicate that the lexA gene product is the negative regulator of the R. sphaeroides SOS response. Furthermore, the morphology, growth and viability of R. sphaeroides lexA(Def) cultures do not show any significant change relative to those of the wild-type strain. Hence, R. sphaeroides is so far the only bacterial species whose viability is known not to be affected by the presence of a lexA(Def) mutation.
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Affiliation(s)
- A Tapias
- Department of Genetics and Microbiology, Autonomous University of Barcelona, Bellaterra, Spain
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Tapias A, López G, Ayora S. Bacillus subtilis LrpC is a sequence-independent DNA-binding and DNA-bending protein which bridges DNA. Nucleic Acids Res 2000; 28:552-9. [PMID: 10606655 PMCID: PMC102501 DOI: 10.1093/nar/28.2.552] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/1999] [Revised: 11/05/1999] [Accepted: 11/05/1999] [Indexed: 11/14/2022] Open
Abstract
Genetic evidence suggests that the Bacillus subtilis lrpC gene product participates in cell growth and sporulation. The purified LrpC protein, which has a predicted molecular mass of 16.4 kDa, is a tetramer in solution. LrpC binds with higher affinity ( K (app) approximately 80 nM) to intrinsically curved DNA than to non-curved DNA ( K (app) approximately 700 nM). DNase I footprinting and the supercoiling of relaxed circular plasmid DNA in the presence of topoisomerase I revealed that LrpC induces DNA bending and constrains DNA supercoils in vitro. The LrpC protein cooperatively increases DNA binding of the bona fide DNA-binding and DNA-bending protein Hbsu. LrpC forms inter- and intramolecular bridges on linear and supercoiled DNA molecules, resulting in a large network and DNA compactation. Collectively, these findings suggest that LrpC is an architectural protein and that its activities could provide a means to modulate DNA transactions.
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Affiliation(s)
- A Tapias
- Departamento de Biotecnología Microbiana, Centro Nacional de Biotecnología, CSIC, Campus Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
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Abstract
The Sinorhizobium meliloti uvrA gene was isolated by complementation of a Rhodobacter sphaeroides UvrA- mutant. DNA sequencing of the region upstream of the S. meliloti uvrA gene reveals the presence of the ssb gene in the opposite transcriptional orientation. PCR-mediated mutagenesis demonstrated that expression of these two genes is inducible by DNA damage, and depends, in both cases, on the direct repeat GTTCN7GTTC (cited according to the direction of uvrA transcription). Comparison of the sequences of recA and uvrA promoters from different bacterial species of the alpha group of the Proteobacteria has identified the direct repeat GTTCYYKTTTTGTTC as the SOS box in this phylogenetic group.
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Affiliation(s)
- A Tapias
- Department of Genetics and Microbiology, Faculty of Sciences, Universitat Autònoma de Barcelona, Bellaterra, Spain
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Abstract
Based upon our earlier studies (A. Tapias, A. R. Fernández de Henestrosa, and J. Barbé, J. Bacteriol. 179:1573-1579, 1997) we hypothesized that the regulatory sequence of the Rhizobium etli recA gene was TTGN11CAA. However, further detailed analysis of the R. etli recA operator described in the present work suggests that it may in fact be GAACN7GTAC. This new conclusion is based upon PCR mutagenesis analysis carried out in the R. etli recA operator, which indicates that the GAAC and GTAC submotifs found in the sequence GAACN7GTAC are required for the maximal stimulation of in vivo transcription and in vitro DNA-protein complex formation. This DNA-protein complex is also detected when the GAACN7GTAC wild-type sequence is modified to obtain GAACN7GAAC, GTACN7GTAC, or GAACN7GTTC. The wild-type promoters of the Rhizobium meliloti and Agrobacterium tumefaciens recA genes, which also contain the GAACN7GTAC sequence, compete with the R. etli recA promoter for the DNA-protein complex formation but not with mutant derivatives in any of these motifs, indicating that the R. etli, R. meliloti, and A. tumefaciens recA genes present the same regulatory sequence.
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Affiliation(s)
- A Tapias
- Molecular Microbiology and Bacterial Genetics Group, Department of Genetics and Microbiology, Universitat Autònoma de Barcelona, Bellaterra, 08193-Barcelona, Spain
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Abstract
Gel-mobility shift assays with crude cell extracts of Rhodobacter sphaeroides, which belongs to the alpha group of the proteobacteria, have shown that a protein binds to the promoter of its recA gene, resulting in two retardation bands. Analysis of the minimal region of the R. sphaeroides recA gene required for the formation of the DNA-protein complexes, revealed the presence of the motifs GTTCN7GATC and GAACN7GAAC, which are centred at positions -21 and +8 from the transcriptional starting point respectively. Using PCR mutagenesis, we have demonstrated that these two motifs are required for the formation of both DNA-protein complexes in vitro as well as for the DNA damage-mediated inducibility of the recA gene in vivo. Furthermore, the level of the recA gene expression in the constitutive mutants is the same as that achieved by the wild-type cells after DNA damage, indicating that the binding protein must be a repressor. The motif GTTCN7GTTC is also present upstream of the R. sphaeroides uvrA promoter, which in vitro specifically binds to a protein and whose expression is DNA damage inducible. Mutagenesis of this motif abolishes both the binding of this protein to the uvrA promoter and the DNA damage-mediated expression of this gene. The fact that the recA and uvrA wild-type promoters compete with each other for the retardation band formation, but not with their mutant derivatives in any of these motifs, indicates that the same repressor binds to the operator of both genes. All these results lead us to propose the sequence GTTCN7GTTC as the SOS box of R. sphaeroides. This is the first SOS box known whose sequence is a direct repeat and not a palindrome.
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Cinca J, Tapias A, Carreño A, Warren M, Mont L, Blanch P, Domingo A, Soler-Soler J. Local repolarization abnormalities induced by transcatheter radiofrequency ablation in pigs. Pacing Clin Electrophysiol 1997; 20:1952-60. [PMID: 9272533 DOI: 10.1111/j.1540-8159.1997.tb03601.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Radiofrequency (RF) ablation alters action potential repolarization of myocardial cells and, theoretically, this should induce ST-T segment changes in the ECG. Since these ECG abnormalities have been rarely reported in patients submitted to RF ablation we assess the ability of the procedure to cause ST-T segment changes in local electrograms. Epicardial ECG mapping was performed in 17 anesthetized open chest pigs submitted to endocardial (n = 9) or to epicardial (n = 8) unipolar radiofrequency ablation (500 kHz, 20 W for 5-10 s). To characterize the cellular electrophysiological alterations induced by RF ablation transmembrane action potentials were recorded at various distances from the ablation lesion; these were compared with seven control pigs. Endocardial RF ablation induced a transient (< 5 min) change of 6.1 +/- 2.4 mV in T wave amplitude (baseline: 12.8 +/- 5.6 mV, P < 0.001) in 141 out of 269 epicardial electrodes. T wave changes were associated with shortening in local activation time (20.1 +/- 2.3 ms at baseline vs 18.5 +/- 2.5 ms at 60 s after ablation, P = 0.03). RF current caused persistent St segment elevation at the center of the ablation lesion with no transmural expansion. Intracellular potentials along a 2-6 mm wide myocardial band bordering the RF lesion lower amplitude (101 +/- 7.0 mV vs 71 +/- 23 mV, P < 0.01) and shorter duration (254 +/- 44 ms vs 156 +/- 29 ms, P < 0.01) than control hearts. The center of the ablation lesion was electrically unexcitable. We concluded that RF ablation alters cellular electrophysiology in small areas surrounding the ablation lesion and this causes short-lasting transmural changes in T 3 wave amplitude and nontransmural ST segment elevation.
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Affiliation(s)
- J Cinca
- Laboratorio de Cardiología Experimental, Hospital General Universitari Vall d'Hebron, Universitat Autònoma de Barcelona, Spain
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Abstract
The promoter of the Rhizobium etli recA gene has been identified by primer extension and by making deletions affecting several regions located upstream of its coding region. A gel mobility shift assay carried out with crude extracts of cells of R. etli has been used to show that a DNA-protein complex is formed in the R. etli recA promoter region in vitro. Analysis of the minimal region of the recA promoter giving rise to this DNA-protein complex revealed the presence of an imperfect palindrome corresponding to the sequence TTGN11CAA. Site-directed mutation of both halves of this palindrome indicated that both motifs, TTG and CAA, are necessary for both normal DNA-protein complex formation in vitro and full DNA damage-mediated inducibility of the recA gene in vivo. However, the TTG motif seems to be more dispensable than the CAA one. The presence of this same palindrome upstream of the recA genes of Rhizobium meliloti and Agrobacterium tumefaciens, whose expression is also regulated in R. etli cells, suggests that this TTGN11CAA sequence may be the SOS box of at least these three members of the Rhizobiaceae.
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Affiliation(s)
- A Tapias
- Department of Genetics and Microbiology, Autonomous University of Barcelona, Bellaterra, Spain
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Abstract
OBJECTIVE The aim of this study was to analyze whether cells with long action potential duration, fast Vmax, and spike-and-dome configuration (M-cells) are present in porcine left ventricular myocardium. METHODS Transmembrane action potentials (n = 505) of the left ventricle were recorded with conventional glass microelectrodes in an epicardial-endocardial direction at 2000 ms basic cycle length in 14 pigs. In 3 pigs, potentials were obtained at 1000, 2000, and 5000 ms cycle length before and after superfusion with quinidine HCl 1 microgram/ml. In addition, transmembrane potentials (n = 52) were recorded in 4 dogs at 2000 ms cycle length to verify the ability of our protocol to detect M-cells. RESULTS In pigs, action potential duration at 90% repolarization was shorter (ANOVA, P < 0.001) and Vmax slower (P < 0.001) in the epicardium than in the other transmural sites, but there were no regional differences in resting membrane potential or in action potential amplitude. Potentials with particularly long phase 3 or with spike-and-dome configuration were not observed. All myocardial sites displayed rate dependence of action potential duration (P = 0.02) which was transmurally homogeneous and persisted after quinidine exposure. The drug did not induce afterdepolarizations. In dogs, potentials with spike-and-dome configuration, long duration, and fast Vmax, like those described in M-cells, were detected in deep epicardial and midmyocardial areas. CONCLUSION The porcine left ventricular myocardium shows transmural differences in action potential duration and Vmax, but, unlike dogs, it lacks M-cells.
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Affiliation(s)
- A Rodríguez-Sinovas
- Laboratorio de Cardiología Experimental, Hospital General Universitari Vall d'Hebron, Universitat Autònoma de Barcelona, Spain
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Cinca J, Bardají A, Carreño A, Mont L, Bosch R, Soldevilla A, Tapias A, Soler-Soler J. ST segment elevation at the surface of a healed transmural myocardial infarction in pigs. Conditions for passive transmission from the ischemic peri-infarction zone. Circulation 1995; 91:1552-9. [PMID: 7867198 DOI: 10.1161/01.cir.91.5.1552] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
BACKGROUND Ischemia of the myocardium surviving an infarction induces ST segment elevation in infarct-related ECG leads. In cases with no viable tissues, ischemia adjacent to the infarction could induce a similar ECG pattern if there is ST segment potential transmission through the necrotic scar. We analyzed whether acute ischemia adjacent to a healed infarction with no viable tissue may induce ST segment elevation on the surface of the necrotic scar. METHODS AND RESULTS Epicardial ST segment changes elicited during 30 minutes of acute reocclusion of the left anterior descending (LAD) coronary artery 2 cm above the first diagonal branch were analyzed by 32-channel mapping in 18 chloralose-anesthetized open-chest pigs with 1-month-old anterior infarctions induced by permanent ligature below the first diagonal branch (group 1). The effect of a previous infarction on the magnitude of ischemic ST segment changes was assessed by similar mapping in 21 control pigs submitted to a LAD ligature 2 cm above the first diagonal branch (group 2, n = 11) or just below this branch (group 3, n = 10). Myocardial perfusion after coronary ligature was estimated in 7 pigs with chronic infarction and in 3 control pigs by mapping of myocardial technetium-99m-methoxyisobutyl isonitrile (99mTc-MIBI) activity in transmural samples underlying each epicardial electrode. The width of cell layers surviving the infarction was measured and their viability after 60 minutes of coronary reocclusion was assessed by intracellular glycogen staining. Reocclusion of the LAD induced parallel ST segment elevation at the periinfarction zone and at the necrotic scar, although in the latter region the changes were less marked (maximal ST segment, 8.4 +/- 3.0 mV versus 2.7 +/- 1.8 mV, ANOVA, P < .001). ST segment elevation inside the scar was greater at the margins (3.9 +/- 1.8 mV) than at sites 20 mm toward the center (2.8 +/- 1.7 mV, P = .003). The necrotic area was virtually devoid of surviving cells except for a 0.22 +/- 0.04-mm-wide subendocardial band that continued to show a positive intracellular glycogen reaction after the second LAD ligature. Acute ischemia adjacent to the infarction (group 1) induced lower ST segment elevation than acute ischemia at a comparable cardiac region in noninfarcted pigs (group 2) (ANOVA, P = .02), despite the fact that these areas developed similar underperfusion after coronary occlusion (percent MIBI activity of that in normal myocardium, 7 +/- 8 versus 7 +/- 6, P = NS). ST segment changes in group 2 pigs were comparable to those induced in group 3 pigs with a 2-cm-lower coronary occlusion. CONCLUSIONS Acute ischemia adjacent to a chronic infarction induces ST segment elevation at the surface of the scar despite the virtual absence of viable tissue within the infarction. Data suggest a passive ST segment potential transmission through the infarction. Moreover, ischemia adjacent to a chronic infarction induces lower ST segment elevation than ischemia not adjacent to a necrosis. The mechanisms accounting for these regional differences are probably independent of collateral myocardial perfusion and ischemia extension.
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Affiliation(s)
- J Cinca
- Laboratorio de Cardiologia Experimental, Hospital General Universitari Vall d'Hebron, Barcelona, Spain
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Riera J, Fernández de Henestrosa AR, Garriga X, Tapias A, Barbé J. Interspecies regulation of the recA gene of gram-negative bacteria lacking an E. coli-like SOS operator. Mol Gen Genet 1994; 245:523-7. [PMID: 7808403 DOI: 10.1007/bf00302266] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The recA genes of Agrobacterium tumefaciens, Rhizobium meliloti, Rhizobium phaseoli and Rhodobacter sphaeroides, species belonging to the alpha-group bacteria of the Proteobacteria class, have been fused in vitro to the lacZ gene of Escherichia coli. By using a mini-Tn5 transposon derivative, each of these recA-lacZ fusions was introduced into the chromosome of each of the four species, and into that of E. coli. The recA genes of three of the alpha bacteria are induced by DNA damage when inserted in A. tumefaciens, R. phaseoli or R. meliloti chromosomes. The expression of the recA gene of R. sphaeroides is DNA damage-mediated only when present in its own chromosome; none of the genes is induced in E. coli. Likewise, the recA gene of E. coli is not induced in any of the four alpha species. These data indicate that A. tumefaciens, R. meliloti and R. phaseoli possess a LexA-like repressor, which is able to block the expression of their recA genes, as well as that of R. sphaeroides, but not the recA gene of E. coli. The LexA repressor of R. sphaeroides does not repress the recA gene of A. tumefaciens, R. meliloti, R. phaseoli or E. coli.
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Affiliation(s)
- J Riera
- Department of Genetics and Microbiology, Faculty of Sciences, Autonomous University of Barcelona, Spain
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