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Background: This study examined how wide- awake local anesthesia no tourniquet (WALANT) surgery in the office versus the standard operating room (OR) impacts patient experience, and the effect wide awake virtual reality (WAVR) has in conjunction with WALANT on patient experience. Methods: This is a patient-reported outcome study of patients undergoing carpal tunnel release by a single surgeon between August 2017 and March 2021. Patients were classified by location; traditional OR versus WALANT in-office. In-office patients were further classified by whether they chose to use WAVR or not. Patients rated overall experience, enjoyability, and anxiety using a Likert scale (1-7). Results: The online survey had a 44.8% response rate. OR patients were twice as likely to report a neutral or negative experience (23% versus 11%, P = 0.03), significantly lower enjoyment scores (44% versus 20%, P = 0.0007)' and higher anxiety (42% versus 26%, P = 0.04) compared with office-based WALANT patients. With the addition of WAVR, office patients reported higher enjoyment than those who did not use WAVR (85% versus 73%, P = 0.05). Patients reporting an anxiety disorder were more likely to choose WAVR when compared with patients without anxiety disorder (73.8% versus 56.4%). When they chose WAVR, they had greater anxiolysis (79% versus 47%, P = 0.01)' and increased enjoyment (90% versus 59%, P = 0.005). Conclusions: This study demonstrates improved patient experience in the office setting, further amplified by WAVR. Preexisting anxiety disorder is a positive predictive variable toward the patients' choice to use WAVR.
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We transitioned our hand practice from the operating room (OR) to our office-based procedure room (OPR) to offer wide-awake, local anesthesia, no tourniquet (WALANT). We have established that using wide-awake virtual reality improves patient comfort and anxiety during wide-awake procedures and helps facilitate our patients' choice of venue. We aimed to assess the effect of this transition on infection rates for procedures performed by a single surgeon in the OR versus the OPR. Methods: A retrospective chart review was performed on a single surgeon's adult patients who underwent elective and closed traumatic upper limb surgeries. A surgical site infection was defined as superficial or deep, based on clinical examination conducted by the surgeon, and was treated with antibiotics within a 4-week postoperative window. Results: From August 2017 to August 2019, 538 (216 OR and 322 OPR) consecutive cases met inclusion criteria. There were six (2.78%) superficial infections and zero deep space infections in the OR cohort compared with four (1.24%) superficial and zero deep space infections in the OPR cohort with no statistical significance. Two-thirds of cases were converted to WALANT and delivered in the office. Conclusions: This narrative study concurs with the current literature that WALANT in the office setting is as safe as the hospital OR-based procedures for selected elective cases. By transitioning suitable cases from the OR to the OPR, a surgeon's overall infection rate should not change.
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OBJECTIVE: To determine whether prenatal exposure to dichlorodiphenyl ethylene (DDE) and polychlorinated biphenyls (PCBs) and concurrent exposure to DDE, PCBs and polybrominated diphenylethers (PBDEs) affect gene expression of aromatase (CYP19A1), 17-α-hydroxylase (CYP17A1), and oestrogen receptors α and ß (ESR 1 and ESR2). METHODS: Based on maternal PCB and DDE levels in the parent generation of the Michigan Fisheater Cohort determined between 1973 and 1991, individual prenatal exposures were estimated and have been published. In 2007, female adult offspring of this cohort were examined. Gene expression and concurrent lipid-adjusted exposures to DDE, PCBs and PBDEs were measured in blood and serum, respectively. Using mixed models and path analyses, gene-expression data were regressed on prenatal and concurrent exposures controlling for confounders. RESULTS: 139 daughters of Michigan fisheaters (65.3%) participated in the investigation. While prenatal PCB levels were statistically significantly associated with decreased expression of the aromatase and 17-α-hydroxylase genes, prenatal DDE levels were significantly related to increased gene expression of aromatase but not of 17-α-hydroxylase. The DDE association seems to be mediated by concurrent lipid-adjusted p,p'-DDE serum levels. Prenatal and concurrent exposure of both PCBs and DDE had comparable effects. No association was found for PBDEs or for the gene expression of ESR 1 and ESR2. CONCLUSIONS: A 40-year antecedent prenatal exposure and concurrent levels of PCBs and DDE are associated with the expression of aromatase and 17-α-hydroxylase genes. Prenatal exposures to organochlorines may instigate long-term alterations of gene expression. Mechanisms of prenatal induction of persistent gene-expression alterations are speculated to be epigenetic in nature.
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Aromatasa/genética , Exposición a Riesgos Ambientales/análisis , Regulación de la Expresión Génica/efectos de los fármacos , Hidrocarburos Halogenados/farmacología , Efectos Tardíos de la Exposición Prenatal , Esteroide 17-alfa-Hidroxilasa/genética , Adulto , Animales , Aromatasa/biosíntesis , Proteínas Portadoras/biosíntesis , Proteínas Portadoras/genética , Estudios de Cohortes , Diclorodifenil Dicloroetileno/sangre , Diclorodifenil Dicloroetileno/farmacología , Receptor alfa de Estrógeno/biosíntesis , Receptor alfa de Estrógeno/genética , Femenino , Peces , Contaminación de Alimentos , Humanos , Persona de Mediana Edad , Proteínas Nucleares/biosíntesis , Proteínas Nucleares/genética , Bifenilos Policlorados/sangre , Bifenilos Policlorados/farmacología , Embarazo , Proteínas de Unión al ARN , Esteroide 17-alfa-Hidroxilasa/biosíntesis , Adulto JovenRESUMEN
Using grounded theory, a multidisciplinary study team compared the narratives of 30 women who had recently experienced a breast cancer scare. Even though 10 women received a benign diagnosis, all women reported a difficult time prediagnosis, characterized by an array of emotions and contemplation of the meaning of life. Diagnosis separated the two groups with emotional relief dominant for the benign group and intensification of emotions for the cancer group. For those diagnosed with cancer, three factors contributed to arriving at a point of acceptance about the diagnosis and treatment: (a) sustained coping mechanisms; (b) a belief system that shifted the meaning of the cancer experience; and (c) the ability to manage non-cancer-related stressful events. Implications include the need for tailored biopsychosocial treatments that focus on reducing stress, enhancing support systems, reframing beliefs about the illness, and providing the opportunity for the women to talk about their experiences.
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Adaptación Psicológica , Neoplasias de la Mama/psicología , Miedo/psicología , Adulto , Anciano , Emociones , Femenino , Humanos , Acontecimientos que Cambian la Vida , Michigan , Persona de Mediana Edad , Calidad de Vida/psicologíaRESUMEN
BACKGROUND: It seems paradoxical that both increased height and earlier age at menarche (which predicts for shorter stature) are both associated with increased breast cancer risk. METHODS: Retrospective data from a parental cohort coupled with prospective interviews with and anthropometric measurements from their daughters were used. Multivariable linear regression analyses were conducted using mixed regression models to account for same-family participants. RESULTS: Controlling for birth weight, maternal height, and birth cohort, and analyzed as a group, a 1-year increase in the age at menarche predicted an increase in standing height, leg length, and trunk height of 0.76, 0.41, and 0.35 cm, respectively. However, when stratifying by birth year (prior to 1966 vs 1966 or after), these relationships were true only for those born prior to 1966. CONCLUSION: Given the height-breast cancer risk association, the emerging evidence linking breast cell proliferation to hormones associated with growth, and the finding in this study that the relationship between age at menarche and adult height no longer exists for women born in 1966 or later, it is possible that the long-established relationship between age at menarche and breast cancer risk may also no longer exist.
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Estatura , Neoplasias de la Mama/etiología , Pierna/anatomía & histología , Menarquia , Adolescente , Adulto , Factores de Edad , Femenino , Humanos , Modelos Lineales , Factores de RiesgoRESUMEN
Wide-awake local anesthesia no tourniquet surgery has been shown to decrease cost and hospital length of stay. The authors studied the use of virtual reality during wide-awake local anesthesia no tourniquet outpatient upper extremity surgery to assess its effect on patient pain, anxiety and fun. Patients undergoing wide-awake local anesthesia no tourniquet surgery were randomized to use (virtual reality) or not use (non-virtual reality) virtual reality during their procedures. Pain, fun, and anxiety were measured with a Likert scale at several time points, as were blood pressure and heart rate. A postoperative questionnaire was used to assess overall satisfaction. Virtual reality patients exhibited lower anxiety scores during injection, during the procedure, and at the end of the procedure. There were no differences in blood pressure, heart rate, or pain scores. Compared with non-virtual reality patients, virtual reality patients' fun scores were higher. Virtual reality patients felt the experience helped them to relax, and they would recommend virtual reality-assisted wide-awake local anesthesia no tourniquet surgery. Among patients with self-reported preexisting anxiety, virtual reality patients had lower pain and anxiety scores during injection of local anesthesia compared with non-virtual reality patients. This study demonstrates that readily available virtual reality hardware and software can provide a virtual reality experience that reduces patient anxiety both during the injection of local anesthesia and during the surgical procedure. (Plast. Reconstr. Surg. 144: 408, 2019.) CLINICAL QUESTION/LEVEL OF EVIDENCE:: Therapeutic, II.
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Anestesia Local/métodos , Mano/cirugía , Realidad Virtual , Adulto , Anciano , Anciano de 80 o más Años , Ansiedad/etiología , Presión Sanguínea/fisiología , Femenino , Felicidad , Frecuencia Cardíaca/fisiología , Humanos , Masculino , Persona de Mediana Edad , Procedimientos Ortopédicos , Dolor/prevención & control , Dimensión del Dolor , Satisfacción del Paciente , Estudios Prospectivos , Método Simple Ciego , Torniquetes , Vigilia , Adulto JovenRESUMEN
BACKGROUND: It is increasingly important for faculty to teach deliberately and provide timely, detailed, and formative feedback on surgical trainee performance. We initiated a multicenter study to improve resident evaluative processes and enhance teaching and learning behaviors while engaging residents in their education. STUDY DESIGN: Faculty from 7 US postgraduate training programs rated resident operative performances using the perioperative briefing, intraoperative teaching, debriefing model, and rated patient visits/academic performances using the entrustable professional activities model via a web-based platform. Data were centrally analyzed and iterative changes made based on participant feedback, individual preferences, and database refinements, with trends addressed using the Plan, Do, Check, Act improvement methodology. RESULTS: Participants (92 surgeons, 150 residents) submitted 3,880 assessments during July 2014 through September 2017. Evidence of preoperative briefings improved from 33.9% ± 2.5% to 95.5% ± 1.5% between April and September 2014 compared with April and September 2017 (p < 0.001). Postoperative debriefings improved from 10.6% ± 2.7% to 90.2% ± 2.5% (p < 0.001) for the same period. Meaningful self-reflection by residents improved from 28.6% to 67.4% (p < 0.001). The number of assessments received per resident during a 6-month period increased from 6.4 ± 6.2 to 13.4 ± 10.1 (p < 0.003). Surgeon-entered assessments increased from 364 initially to 685 in the final period, and the number of resident assessments increased from 308 to 445. We showed a 4-fold increase in resident observed activities being rated. CONCLUSIONS: By adopting recognized educational models with repeated Plan, Do, Check, Act cycles, we increased the quality of preoperative learning objectives, showed more frequent, detailed, and timely assessments of resident performance, and demonstrated more effective self-reflection by residents. We monitored trends, identified opportunities for improvement and successfully sustained those improvements over time, applying a team-based approach.
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Educación de Postgrado en Medicina/organización & administración , Cirugía General/educación , Internet , Internado y Residencia , Mejoramiento de la Calidad , Evaluación Educacional , Retroalimentación Formativa , Humanos , Michigan , Modelos Educacionales , Desarrollo de Programa , Estados UnidosRESUMEN
BACKGROUND: The codon 72 polymorphism in p53 has been implicated in colorectal cancer (CRC) risk, prognosis and CRC health disparities. We examined the functional consequence of this polymorphism in CRC. EXPERIMENTAL DESIGN: Plasmids (pCMV6) that express different phenotypes of p53 [p53 wild type (wt) at codon 72 (R72wt), R72wt with mutation at codon 273 cysteine (R72273Cys), p53 mutation at codon 72 (P72wt) and P72wt with mutation at codon 273 (P72273Cys)] were constructed. The CRC cell line Caco2, which does not express p53 for in vitro studies, was used as host. CRC xenografts were established in severe combined immunodeficient (SCID) mice using established cell lines. CRC surgical specimens, corresponding normal colon, and tumor xenografts were sequenced for codon 72 polymorphism of p53. Proteins signaling mechanisms were evaluated to assess the functional consequence of P72 phenotype of p53. RESULTS: This study demonstrated a significantly increased survival of cells expressing P72wt, mutant phenotype, versus R72wt phenotype. WB analyses revealed that P72wt induced activation of p38 and RAF/MEK/ extracellular signal-regulated kinase (ERK) MAP kinases. Activation of CREB was found to be higher in tumors that exhibit P72 phenotype. Metastatic lesions of CRC expressed more phospho-CREB than non-metastatic lesions. The expression of P72wt promoted CRC metastasis. CONCLUSIONS: P72 contributes to the aggressiveness of CRC. Because P72 is over-expressed in CRC, specifically in African-American patients, this suggests a role for P72 in cancer health disparities. This work was supported by NIH/NCI Workforce Diversity Grant R21-CA171251 & U54CA118948.
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BACKGROUND: Gender and/or gender-stereotypes might influence surgical education. We hypothesized that female surgeons might focus their learning and teaching differently from male surgeons. METHODS: Residents and surgeons (multi-institutional) individually recorded preoperatively discussed learning objectives (LO) for matching cases. Narratives were classified as knowledge-based, skill-based, or attitude-based. Multinomial logistic regression analyses, LO = dependent variable; independent variables = resident/surgeon gender, PGY level, timing of entry-to-procedure date, and quarters-of-year. RESULTS: 727 LOs from 125 residents (41% female) and 49 surgeons (20% female) were classified. Female residents were 1.4 times more likely to select knowledge over skill. With female surgeons, residents were 1.6 and 2.1 times more likely to select knowledge over skill and attitude over skill than if the surgeon was male. PGY 4/5 residents chose attitude-based LOs over junior residents. CONCLUSION: Resident, surgeon gender and year-of-training influence learning objectives. Whether this reflects gender stereotyping by residents or differences in attending teaching styles awaits further exploration.
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Aprendizaje , Médicos Mujeres , Cirujanos , Enseñanza , Actitud del Personal de Salud , Competencia Clínica , Docentes Médicos , Femenino , Cirugía General/educación , Humanos , Internado y Residencia , Masculino , Estados UnidosRESUMEN
BACKGROUND: Resident and curriculum evaluation require tracking surgical resident operative performance, yet what and when to measure remains unclear. METHODS: From a multi-institutional database, we reviewed 611 resident/surgeon-paired assessments of ACGME Milestones and modified OPRS ratings for different cases and postgraduate years. RESULTS: Faculty Milestone ratings increased with each PGY (p=<0.001) and correlated with resident self-ratings (ICC = 0.83). Mean OPRS scores increased in small increments with substantial intra-year variability. Progression among individual OPRS subcategories was not apparent from more global analyses. Interestingly, male faculty offered lower ratings than female faculty. CONCLUSIONS: Milestones and modified mean OPRS ratings suggest residents are learning, yet lack sufficient discrimination for promotion or curricular analysis. Differential progression through OPRS subcategories suggests a taxonomy of surgical learning that can be tailored to focus on different skills at each point in the training continuum. The effect of faculty gender on resident ratings awaits further study.
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Competencia Clínica , Evaluación Educacional/métodos , Cirugía General/educación , Internado y Residencia , Curriculum , Bases de Datos Factuales , Educación de Postgrado en Medicina , Docentes Médicos , Femenino , Humanos , Masculino , Estados UnidosRESUMEN
BACKGROUND: We studied prevalence and predictors of meaningful self-reflection among surgical residents and with prompting/structured interventions, sought to improve/sustain resident skills. METHODS: Residents from six programs recorded 1032 narrative self-reflective comments (120 residents), using a web-based platform. If residents identified something learned or to be improved, self-reflection was deemed meaningful. Independent variables PGY level, resident/surgeon gender, study site/Phase1: July2014-August2015 vs. Phase2: September2015-September2016) were analyzed. RESULTS: Meaningful self-reflection was documented in 40.6% (419/1032) of entries. PGY5's meaningfully self-reflected less than PGY1-4's, 26.1% vs. 49.6% (p = 0.002). In multivariate analysis, resident narratives during Phase 2 were 4.7 times more likely to engage in meaningful self-reflection compared to Phase1 entries (p < 0.001). Iterative changes during Phase2 showed a 236% increase in meaningful self-reflection, compared to Phase1. CONCLUSIONS: Surgical residents uncommonly practice meaningful self-reflection, even when prompted, and PGY5/chief residents reflect less than more junior residents. Substantial/sustained improvements in resident self-reflection can occur with both training and interventions.
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Internado y Residencia , Autoevaluación (Psicología) , Especialidades Quirúrgicas/educación , Femenino , Humanos , Masculino , Periodo Perioperatorio , Mejoramiento de la CalidadAsunto(s)
Intubación Intratraqueal/instrumentación , Monitoreo Neuromuscular/métodos , Traumatismos del Nervio Laríngeo Recurrente/prevención & control , Tiroidectomía/efectos adversos , Electrodos , Humanos , Intubación Intratraqueal/métodos , Monitoreo Neuromuscular/instrumentación , Estudios Prospectivos , Nervio Laríngeo Recurrente/fisiología , Sensibilidad y Especificidad , Tráquea/inervación , Tráquea/fisiología , Pliegues Vocales/inervación , Pliegues Vocales/fisiologíaRESUMEN
BACKGROUND: Oral squamous cell cancer (OSCC) is often diagnosed in late stages. Informative biomarkers could play a key role in early diagnosis. Prior case-control studies identified discriminatory salivary mRNA markers for OSCC. The National Cancer Institute (NCI) recommends prospective-specimencollection, retrospective-blinded-evaluation (PRoBE) design study for rigorous biomarker identification and validation. METHODS: A PRoBE design study enrolled 170 patients with lesions suspicious for OSCC. Saliva was collected before performing oral biopsy. Six pre-specified oral-cancer-associated mRNAs (IL1ß, IL8, OAZ1, SAT, S100P, and DUSP1) and five housekeeping mRNAs (MT-ATP6, RPL30, RPL37A, RPL0, and RPS17) were measured by quantitative polymerase chain reaction (PCR) without knowledge of tissue diagnosis. A pre-specified multi-marker panel from prior NCI - Early Detection Research Network (EDRN) studies was evaluated in this new PRoBE dataset. Individual marker cycle thresholds (Ct) from PCR were also compared in cancer versus control, and new discriminatory models were generated. RESULTS: The EDRN model was validated based on pre-specified statistical analysis plan. Ct values of individual mRNAs reflect an approximately twofold to nearly fourfold increase in concentration in invasive OSCC (P less than 0.01 for all). A new model from this intended-use population with incorporation of housekeeping genes demonstrates a maximal sum of sensitivity and specificity of 150.7% with an area under the receiver operating characteristic (ROC) curve of over 0.85. CONCLUSION: The validation of six pre-specified individual salivary transcriptome markers of OSCC and a pre-specified multi-marker model in a new prospective population supports the robustness of these markers and the multi-marker methodology. New models generated in this intended-use population have the potential to further enhance the decision process for early biopsy. Lesions at very low risk for cancer could be identified noninvasively as could those at significantly increased risk. Further study is necessary to assure effective implementation of this technology into routine clinical practice.
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Biomarcadores de Tumor/genética , Carcinoma de Células Escamosas/diagnóstico , Carcinoma de Células Escamosas/genética , Neoplasias de la Boca/diagnóstico , Neoplasias de la Boca/genética , Saliva/química , Transcripción Genética , Detección Precoz del Cáncer , Femenino , Perfilación de la Expresión Génica , Humanos , Masculino , Persona de Mediana Edad , Reacción en Cadena de la Polimerasa , Estudios Prospectivos , Factores de RiesgoRESUMEN
INTRODUCTION: The management and removal of thoracostomy tubes for trauma-related hemothorax and pneumothorax is controversial. General recommendations exist; however, institutional data related to an algorithmic approach has not been well described. The difficulty in establishing an algorithm centers about individualized patients' needs for subsequent management after thoracostomy tube placement. In our institution, we use the same protocol for all trauma patients who receive a thoracostomy tube with minimal complications. PURPOSE: To present the clinical outcomes of patients who required a tube thoracostomy for traumatic injury and were managed by an institutional protocol. METHODS: A retrospective chart review of 313 trauma patients at a single level I trauma institution from January 2008 through June 2012 was conducted. Inclusion criteria were patient age ≥ 18 years, involvement in a trauma, and requirement of a thoracostomy tube. The patients' charts were reviewed for demographic data, injury severity score (ISS), length of stay (LOS), and chest-tube specific data. Thoracostomy tube complications were defined as persistent air leak, persistent pneumothorax, recurrent pneumothorax, and clotting of thoracostomy tube. The patients were managed per our institutional algorithm. Descriptive statistics were performed. RESULTS: Most of the patients who required a thoracostomy tube had blunt-related traumas (271/313; 86.6%), while 42 patients (13.4%) sustained penetrating injuries. There were 215 (68.7%) male patients. The average age at time of injury was 45.7 ± 21.1 years and the mean ISS was 24.9 ± 15.9 (mean ± SD). Elevated alcohol levels were found in 65 of the 247 patients who were tested upon admission (26.3%). Overall, 15 patients (4.8%) developed a thoracostomy tube related complication: persistent air leak in six patients, persistent pneumothorax in six patients, recurrent pneumothorax in two patients, and clotted thoracostomy tube in one patient. The average LOS was 10.4 ± 8.4 days, and the mean length of thoracostomy tube placement was 5.9 ± 4.3 days. CONCLUSIONS: Our algorithmic thoracostomy tube management protocol resulted in a complication rate of 4.8%. By managing thoracostomy tubes in a systematic manner, our patients have improved outcomes following placement and removal compared to other studies.
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OBJECTIVE: To examine the blood leukocyte expression of 22 sex steroid metabolic/signaling genes according to female reproductive status. METHODS: Michigan Fisheaters' Cohort participants underwent blood collection during the luteal phase of the menstrual cycle or randomly in non-menstruating participants. Gene expression (GE) was measured using Taqman hydrolysis probes and quantitative RT-PCR. Repeatability of four genes was determined in a subgroup. RESULTS: Five premenstrual, 57 premenopausal (20 users of systemic hormonal contraception), and 43 postmenopausal females participated. After Bonferroni correction for multiple comparisons of median GE between groups, three findings remained significant: greater GE of AhR in postmenopausal women than in premenopausal non-users of systemic hormonal contraception; and greater GE of ESR2 and HSD17B7 in premenstrual girls compared to postmenopausal women. Modest intra-class correlations were identified for CYP 19, ESR1, and ESR2 GE measured both in 2007 and 2010, but no intra-class correlation over the same time period was found for CYP17. CONCLUSIONS: There was little differential variation of blood leukocyte sex steroid ge between premenopausal women in the luteal phase of the menstrual cycle and postmenopausal women for most genes analyzed, but it will be necessary to make statistical adjustments in future epidemiologic studies in two circumstances: 1) when comparing AhR GE in premenopausal women non-users of systemic hormone contraception with postmenopausal women and 2) when comparing ESR2 and HSD17B7 GE in studies that include premenstrual girls. Developmental differences may explain the differential GE found in ESR2 and HSD17B7 in premenstrual girls compared with postmenopausal women.
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BACKGROUND: Reliable techniques to measure polychlorinated biphenyl (PCB) congeners make the clearer definition of their effects on human health possible. Given that PCBs are classified as endocrine disrupters, we sought to explore the expression of some key genes involved in sex steroid metabolism. OBJECTIVES: To examine common classification schemes of PCB congeners and determine whether exposure to groups classified by mechanism of action alter the gene expression (GE) of CYP17, CYP19, and ESR1 and ESR2. METHODS: GE and exposure to various classifications of lipid-adjusted PCB congeners were examined in 139 daughters of the Michigan Fisheaters' Cohort. Using mixed models analyses and adjusting for age, menopausal status, and current use of oral contraceptives and hormone replacement therapy, GE data were regressed on exposure to PCB congener groupings based on mechanism of action. RESULTS: Three novel findings are elucidated: first, that up-regulation of CYP19 expression is associated with exposure to PCB groupings containing dioxin-like, potentially anti-estrogenic, immunotoxic congeners, including PCB IUPAC #74, #105, #118, #138, #156, #157, #158, #167, and #170 from this cohort. Second, that exposure to similar congeners (PCB IUPAC #105, #156, #157, #158, and #167 in this cohort) but using a classification based solely on hormonal mechanisms of action is associated with increased expression of ESR2. Third, that increased expression of CYP17 is of borderline significance when associated with exposure to PCB IUPAC #118, #138, and #156. CONCLUSIONS: These findings are both counter-intuitive and intriguing. Rather than exhibiting anti-estrogenic effects alone, they suggest that these congeners up-regulate the major enzyme involved in estrogen synthesis and tend to confirm previous findings of links between AhR and ER signaling pathways. Replication of these findings, expansion of the number of genes examined, exploration of mixtures of environmental chemicals, and subsequent study of health outcomes in a larger cohort are future priorities.