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EJNMMI Res ; 9(1): 98, 2019 Nov 21.
Artigo em Inglês | MEDLINE | ID: mdl-31754913


BACKGROUND: Combining modalities using dual-labeled antibodies may allow preoperative and intraoperative tumor localization and could be used in image-guided surgery to improve complete tumor resection. Trastuzumab is a monoclonal antibody against the human epidermal growth factor-2 (HER2) receptor and dual-labeled trastuzumab with both a fluorophore (IRDye800CW) and a radioactive label (111In) can be used for multimodal imaging of HER2-positive breast cancer. The aim of this study was to demonstrate the feasibility of HER2-targeted multimodal imaging using [111In]In-DTPA-trastuzumab-IRDye800CW in an orthotopic breast cancer model. METHODS: Trastuzumab was conjugated with p-isothiocyanatobenzyl (ITC)-diethylenetriaminepentaacetic acid (DTPA) and IRDye800CW-NHS ester and subsequently labeled with 111In. In a dose escalation study, the biodistribution of 10, 30, and 100 µg [111In]In-DTPA-trastuzumab-IRDye800CW was determined 48 h after injection in BALB/c nude mice with orthotopic high HER2-expressing tumors. Also, a biodistribution study was performed in a low HER2-expressing breast cancer model. In addition, multimodal image-guided surgery was performed in each group. Autoradiography, fluorescence microscopy, and immunohistochemically stained slices of the tumors were compared for co-localization of tumor tissue, HER2 expression, fluorescence, and radiosignal. RESULTS: Based on the biodistribution data, a 30 µg dose of dual-labeled trastuzumab (tumor-to-blood ratio 13 ± 2) was chosen for all subsequent studies. [111In]In-DTPA-trastuzumab-IRDye800CW specifically accumulated in orthotopic HER2-positive BT474 tumors (101 ± 7 %IA/g), whereas uptake in orthotopic low HER2-expressing MCF7 tumor was significantly lower (1.2 ± 0.2 %IA/g, p = 0.007). BT474 tumors could clearly be visualized with both micro-SPECT/CT, fluorescence imaging and subsequently, image-guided resection was performed. Immunohistochemical analyses of BT474 tumors demonstrated correspondence in fluorescence, radiosignal, and high HER2 expression. CONCLUSIONS: Dual-labeled trastuzumab showed specific accumulation in orthotopic HER2-positive BT474 breast tumors with micro-SPECT/CT and fluorescence imaging and enabled image-guided tumor resection. In the clinical setting, [111In]In-DTPA-trastuzumab-IRDye800CW could be valuable for preoperative detection of (metastatic) tumors by SPECT/CT imaging, and intraoperative localization by using a gamma probe and fluorescence image-guided surgery to improve radical resection of tumor tissue in patients with HER2-positive tumors.

Nat Commun ; 10(1): 3118, 2019 07 16.
Artigo em Inglês | MEDLINE | ID: mdl-31311922


Iatrogenic injury of the ureters is a feared complication of abdominal surgery. Zwitterionic near-infrared fluorophores are molecules with geometrically-balanced, electrically-neutral surface charge, which leads to renal-exclusive clearance and ultralow non-specific background binding. Such molecules could solve the ureter mapping problem by providing real-time anatomic and functional imaging, even through intact peritoneum. Here we present the first-in-human experience of this chemical class, as well as the efficacy study in patients undergoing laparoscopic abdominopelvic surgery. The zwitterionic near-infrared fluorophore ZW800-1 is safe, has pharmacokinetic properties consistent with an ideal blood pool agent, and rapid elimination into urine after a single low-dose intravenous injection. Visualization of structure and function of the ureters starts within minutes after ZW800-1 injection and lasts several hours. Zwitterionic near-infrared fluorophores add value during laparoscopic abdominopelvic surgeries and could potentially decrease iatrogenic urethral injury. Moreover, ZW800-1 is engineered for one-step covalent conjugatability, creating possibilities for developing novel targeted ligands.

Complicações Intraoperatórias/prevenção & controle , Laparoscopia/efeitos adversos , Compostos de Amônio Quaternário/administração & dosagem , Ácidos Sulfônicos/administração & dosagem , Ureter/diagnóstico por imagem , Adolescente , Adulto , Idoso , Feminino , Corantes Fluorescentes/administração & dosagem , Corantes Fluorescentes/efeitos adversos , Corantes Fluorescentes/farmacocinética , Voluntários Saudáveis , Humanos , Infusões Intravenosas , Complicações Intraoperatórias/etiologia , Ionóforos/administração & dosagem , Ionóforos/efeitos adversos , Ionóforos/farmacocinética , Laparoscopia/métodos , Masculino , Pessoa de Meia-Idade , Imagem Óptica/métodos , Compostos de Amônio Quaternário/efeitos adversos , Compostos de Amônio Quaternário/farmacocinética , Espectroscopia de Luz Próxima ao Infravermelho/métodos , Ácidos Sulfônicos/efeitos adversos , Ácidos Sulfônicos/farmacocinética , Ureter/lesões , Adulto Jovem
Ann Surg Oncol ; 24(7): 1997-2005, 2017 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-28188500


BACKGROUND: Data on isolated limb perfusion (ILP) in elderly melanoma patients are scarce. We aimed to evaluate the efficacy and safety of ILP in our institutional cohort of melanoma patients. METHODS: We performed retrospective analysis of stage IIIB/C melanoma patients who underwent ILP for melanoma in-transit metastases (ITMs) in our institution between 2000 and 2016. Normothermic ILP was performed with either melphalan or melphalan and tumor necrosis factor. Baseline and treatment characteristics, locoregional progression-free survival (LPFS) and melanoma-specific survival (MSS) were assessed and prognostic factors for response, recurrence, and survival were analyzed using univariable and multivariable analysis. RESULTS: Overall, 91 patients were included in this study. Based on the median age of 70 years, we split patients into younger and elderly groups. No differences in response rates were observed between age groups, with an overall response rate of 81% and complete response (CR) rate of 47%. LPFS did not differ between age groups, and median LPFS was 16 months for patients with a CR. Median MSS was 38 months and differed between younger (45 months) and elderly patients (18 months). Toxicity was generally mild and did not differ between age groups. Two patients (2.2%) suffered Wieberdink IV toxicity, while no patients required amputation because of severe toxicity. CR was prognostic for improved LPFS and MSS, while patients >70 years of age and patients with stage IIIC disease had a higher risk of melanoma-specific death. CONCLUSIONS: Because of its safety profile and high CR rates, ILP is a viable option for patients with bulky or multiple melanoma ITMs, including elderly (>70 years of age) patients.

Quimioterapia do Câncer por Perfusão Regional/métodos , Extremidades , Melanoma/tratamento farmacológico , Melfalan/administração & dosagem , Recidiva Local de Neoplasia/tratamento farmacológico , Idoso , Antineoplásicos Alquilantes/administração & dosagem , Feminino , Seguimentos , Humanos , Masculino , Melanoma/irrigação sanguínea , Melanoma/patologia , Metástase Neoplásica , Recidiva Local de Neoplasia/irrigação sanguínea , Recidiva Local de Neoplasia/patologia , Segurança do Paciente , Estudos Retrospectivos , Taxa de Sobrevida , Resultado do Tratamento
J Clin Invest ; 126(10): 4030-4044, 2016 10 03.
Artigo em Inglês | MEDLINE | ID: mdl-27643438


In addition to the infectious consequences of immunodeficiency, patients with Wiskott-Aldrich syndrome (WAS) often suffer from poorly understood exaggerated immune responses that result in autoimmunity and elevated levels of serum IgE. Here, we have shown that WAS patients and mice deficient in WAS protein (WASP) frequently develop IgE-mediated reactions to common food allergens. WASP-deficient animals displayed an adjuvant-free IgE-sensitization to chow antigens that was most pronounced for wheat and soy and occurred under specific pathogen-free as well as germ-free housing conditions. Conditional deletion of Was in FOXP3+ Tregs resulted in more severe Th2-type intestinal inflammation than that observed in mice with global WASP deficiency, indicating that allergic responses to food allergens are dependent upon loss of WASP expression in this immune compartment. While WASP-deficient Tregs efficiently contained Th1- and Th17-type effector differentiation in vivo, they failed to restrain Th2 effector responses that drive allergic intestinal inflammation. Loss of WASP was phenotypically associated with increased GATA3 expression in effector memory FOXP3+ Tregs, but not in naive-like FOXP3+ Tregs, an effect that occurred independently of increased IL-4 signaling. Our results reveal a Treg-specific role for WASP that is required for prevention of Th2 effector cell differentiation and allergic sensitization to dietary antigens.

Hipersensibilidade Alimentar/metabolismo , Fatores de Transcrição Forkhead/fisiologia , Linfócitos T Reguladores/metabolismo , Células Th2/imunologia , Proteína da Síndrome de Wiskott-Aldrich/genética , Animais , Diferenciação Celular/imunologia , Feminino , Hipersensibilidade Alimentar/imunologia , Humanos , Imunoglobulina E/fisiologia , Masculino , Camundongos da Linhagem 129 , Camundongos Knockout , Mutação , Linfócitos T Reguladores/imunologia , Transcriptoma , Proteína da Síndrome de Wiskott-Aldrich/metabolismo
J Natl Compr Canc Netw ; 13(9): 1111-9, 2015 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-26358795


BACKGROUND: The circumferential resection margin (CRM) is a significant prognostic factor for local recurrence, distant metastasis, and survival after rectal cancer surgery. Therefore, availability of this parameter is essential. Although the Dutch total mesorectal excision trial raised awareness about CRM in the late 1990s, quality assurance on pathologic reporting was not available until the Dutch Surgical Colorectal Audit (DSCA) started in 2009. The present study describes the rates of CRM reporting and involvement since the start of the DSCA and analyzes whether improvement of these parameters can be attributed to the audit. METHODS: Data from the DSCA (2009-2013) were analyzed. Reporting of CRM and CRM involvement was plotted for successive years, and variations of these parameters were analyzed in a funnelplot. Predictors of CRM involvement were determined in univariable analysis and the independent influence of year of registration on CRM involvement was analyzed in multivariable analysis. RESULTS: A total of 12,669 patients were included for analysis. The mean percentage of patients with a reported CRM increased from 52.7% to 94.2% (2009-2013) and interhospital variation decreased. The percentage of patients with CRM involvement decreased from 14.2% to 5.6%. In multivariable analysis, the year of DSCA registration remained a significant predictor of CRM involvement. CONCLUSIONS: After the introduction of the DSCA, a dramatic improvement in CRM reporting and a major decrease of CRM involvement after rectal cancer surgery have occurred. This study suggests that a national quality assurance program has been the driving force behind these achievements.

Carcinoma/cirurgia , Documentação/tendências , Auditoria Médica/estatística & dados numéricos , Melhoria de Qualidade/estatística & dados numéricos , Neoplasias Retais/cirurgia , Idoso , Carcinoma/patologia , Procedimentos Cirúrgicos do Sistema Digestório/normas , Documentação/normas , Feminino , Humanos , Masculino , Estadiamento de Neoplasias , Neoplasia Residual , Países Baixos , Neoplasias Retais/patologia , Fatores de Tempo , Carga Tumoral