Resilience and distress among adolescents and young adults receiving hematopoietic cell transplantation: The Promoting Resilience in Stress Management randomized trial.

BACKGROUND: Adolescents and young adults (AYAs) receiving hematopoietic cell transplantation (HCT) are at high risk of poor psychosocial health. This study aimed to determine whether the Promoting Resilience in Stress Management (PRISM) intervention mitigated these risks during the first 6 months posttransplant. METHODS: This multisite, parallel, randomized trial was conducted from April 2019 to March 2023. Eligible AYAs were aged 12-24 years, English speaking, and within 1 month of HCT for cancer or cancer predisposition syndrome. They were assigned 1:1 to PRISM (a brief, skills-based intervention targeting "resilience resources" [stress management, goal setting, cognitive reframing, and meaning making]) or usual care (UC). Outcomes included total symptoms of depression and anxiety (Hospital Anxiety and Depression Scale; primary outcome), hope (Snyder Hope Scale), resilience (10-item Connor-Davidson Resilience Scale), and health-related quality of life (HRQOL; Pediatric Quality of Life Inventory Cancer Module). Analyses leveraged multivariable linear regressions; exploratory analyses assessed the influence of baseline depression or anxiety. RESULTS: Of 94 enrolled and randomized AYAs, the mean age was 16.7 years (SD, 4.2); 43 (46%) were female, 56 (60%) were non-Hispanic White, 22 (23%) were Hispanic, and nine (10%) were Black. Most (77%) had leukemia. Of n = 50 randomized to PRISM and n = 44 to UC, 37 (74%) and 33 (73%) completed all study procedures, respectively. In intention-to-treat analyses, PRISM did not affect 6-month depression and anxiety (ß = -1.1; 95% CI, -3.7 to 1.5), hope (ß = 0.83; 95% CI, -3.3 to 4.9), resilience (ß = -0.01; 95% CI, -3.0 to 3.0), or HRQOL (ß = 1.5; 95% CI, -4.7 to 7.9). Among AYAs with preexisting anxiety or depression, PRISM recipients reported greater 6-month improvements in hope (score change, +3.71; SD, 6.9) versus UC recipients (score change, -2.76; SD, 6.5) (p = .04). CONCLUSIONS: Resilience coaching did not influence outcomes in this sample. Exploratory findings suggest it may be more effective when directed toward those with concurrent distress.

CD43-positive, EWSR1::FLI1 -rearranged Soft Tissue Sarcoma in a Pediatric Patient With History of B-Cell Acute Lymphoblastic Leukemia.

Ewing sarcoma is a small round blue cell tumor typically characterized by an EWSR1 rearrangement and expression of CD99 and NKX2.2, without expression of hematopoietic markers such as CD45. CD43 is an alternative hematopoietic immunohistochemical marker often utilized in the workup of these tumors and its expression typically argues against Ewing sarcoma. We report a 10-year-old with history of B-cell acute lymphoblastic leukemia presenting with an unusual malignant shoulder mass with variable CD43 positivity, but with an EWSR1::FLI1 fusion detected by RNA sequencing. Her challenging workup highlights the utility of next-generation DNA-based and RNA-based sequencing methods in cases with unclear or conflicting immunohistochemical results.

We Grieve Too.

In this narrative medicine essay, a pediatric oncologist grapples with the emotions of loss and guilt while attending the memorial service of her 8-year-old patient.

Resilience Intervention Improves Stress-Related Gene Expression in Adolescent and Young Adult HCT Recipients.

Overactivation of the stress response can influence cancer outcomes through immune-related pathways. Adolescents and young adults (AYAs) undergoing hematopoietic cell transplantation (HCT) are at risk for poor outcomes, yet there are limited behavioral interventions and no psychosocial biomarker data for this population. The Conserved Transcriptional Response to Adversity (CTRA) is an inflammation-related pattern observed in conditions of heightened stress and is associated with HCT outcomes. The objective of the current study was to explore the CTRA gene regulatory impact of Promoting Resilience in Stress Management (PRISM) intervention among AYAs receiving HCT. We hypothesized that patients who received the intervention would have favorable gene expression signatures compared to those in the control arm. This was an ancillary study within a randomized trial testing the PRISM intervention on psychosocial outcomes among AYAs aged 12 to 24 years receiving HCT (NCT03640325). CTRA was quantified through genome-wide transcriptional profiles obtained from whole blood collected at baseline, 1-, and 3-month post-HCT. Group differences in CTRA gene expression were estimated using mixed-effect linear models. There were no baseline group differences in CTRA expression, but PRISM participants showed a greater decline in CTRA at 1 month compared to controls (ß -0.301 ± SE 0.114, P = .016), even when controlling for demographic (Group × Time interaction: F(2, 18) = 7.41, P = .004; ß -0.386 ± 0.127, P = .007) and clinical covariates (Group × Time interaction: F(2, 20) = 7.03, P = .005; ß -0.480 ± 0.144, P = .003). These differences were not detectable at 3 months (ß -0.147 ± SE 0.120, P = .235). There was a change in stress-related gene expression among AYAs randomized to a psychosocial intervention. The stress-inflammation axis may be a targetable pathway in the AYA HCT population.

Little patients, big impacts: a narrative review of palliative and emergent radiotherapy for pediatric cancers.

BACKGROUND AND OBJECTIVE: The use of radiotherapy (RT) in the palliative and emergent settings for pediatric cancers is an under-utilized resource. Our objective was to provide an evidence-based review of the data to increase awareness of the benefit for this population along with providing guidance on pediatric specific treatment considerations for palliative care physicians, pediatric oncologists, and radiation oncologists. METHODS: A narrative review was performed querying PubMed, MEDLINE, ClinicalTrials.gov databases, and supplemented with review articles, survey studies, current and recent clinical trials. When limited data existed, well-designed retrospective and prospective studies in the adult setting were evaluated and expert opinion was provided from pediatric oncologists. KEY CONTENT AND FINDINGS: Pediatric specific treatment considerations include the use of anesthesia, impact of treatment on the developing child, and logistical challenges of RT. Treatment modality and dose selection are driven by histology and symptomatic site of pain, where we discuss detailed recommendations for hematologic, central nervous system, and solid tumors. For palliative RT, an underlying principle of searching for the lowest effective dose to balance response rate with minimal acute and late treatment related morbidity and logistical hardships is of paramount importance when caring for a pediatric patient. Lastly, we outline how to effectively communicate this option to patients and their caregivers. CONCLUSIONS: Palliative RT can be of valuable benefit in most settings for patients with pediatric cancer. There is an unmet need for prospective data to inform on dose-fractionation along with patient and caregiver reported outcomes.

STRIvE-02: A First-in-Human Phase I Study of Systemically Administered B7-H3 Chimeric Antigen Receptor T Cells for Patients With Relapsed/Refractory Solid Tumors.

PURPOSE: B7-H3 is an immunoregulatory protein overexpressed by many pediatric solid tumors with limited expression on critical organs, making it an attractive immunotherapy target. We present a first-in-human phase I clinical trial systemically administered B7-H3 chimeric antigen receptor (CAR) T cells for young patients with relapsed or refractory solid tumors. PATIENTS AND METHODS: Patients were enrolled onto a phase I trial to examine the safety of B7-H3-specific CARs at various dose levels (DLs) using a standard 3 + 3 dose escalation design. RESULTS: Sixteen patients (range, 11-24 years; median, 18.5 years) were enrolled, and nine were treated at DL1 (0.5 × 106 CAR T cells/kg; n = 3) or DL2 (1 × 106 CAR T cells/kg; n = 6). There were no first infusion dose-limiting toxicities. Maximum first-infusion circulating CAR T cells detected in the peripheral blood were 4.98 cells/µL (range, 0-4.98 cells/µL) with detection of CAR T cells colocalizing with tumor cells at the site of metastatic disease in one patient. Patients were eligible for subsequent infusions. An objective partial response by PERCIST criteria was observed 28 days after a second CAR T cell infusion in a patient who did not have an objective response after the first infusion. The second infusion demonstrated marked enhancement of CAR T cell expansion to 1,590 cells/µL and was accompanied by cytokine release syndrome and dose-limiting transaminitis. Detailed peripheral blood cytokine profiling revealed elevated IL-21 levels preinfusion 2 compared with infusion 1. CONCLUSION: B7-H3 CAR T cells are tolerable and demonstrate limited antitumor activity without acute on-target, off-tumor toxicity. High levels of CAR T cell expansion may be necessary to achieve objective responses, but undefined host and tumor microenvironment factors appear to be critical (ClinicalTrials.gov identifier: NCT04483778).

Clinical RNA sequencing clarifies variants of uncertain significance identified by prior testing.

Purpose: Sequencing-based genetic testing often identifies variants of uncertain significance (VUS) or fails to detect pathogenic variants altogether. We evaluated the utility of RNA sequencing (RNA-seq) to clarify VUS or identify missing variants in a clinical setting. Methods: Over a 2-year period, genetics providers at a single institution referred 26 cases for clinical RNA-seq. Cases had either no candidate variant identified by prior testing or a VUS suspected to impact splicing or expression. A committee reviewed each submission to ensure it met study criteria. Results: Among 26 cases, 8 could not be sequenced because of poor expression in an accessible tissue, 2 did not meet inclusion criteria, 3 were solved prior to collection, and 4 families declined participation or did not complete sample collection. For the 9 cases sequenced, the clinical laboratory reported two positive, four negative, and three "indeterminate." For all three indeterminate cases, original RNA-seq data was manually evaluated and deemed explanatory. Conclusion: Clinical RNA-seq can clarify VUS, especially splice variants, but laboratory-specific interpretation guidelines may lead to indeterminate results. Identifying individuals likely to benefit from RNA-seq and providing appropriate counseling poses unique challenges.

Congenital pleuropulmonary blastoma in a newborn with a variant of uncertain significance in DICER1 evaluated by RNA-sequencing.

BACKGROUND: Pleuropulmonary blastoma (PPB) is a rare mesenchymal malignancy of the lung and is the most common pulmonary malignancy in infants and children. Cystic PPB, the earliest form of PPB occurring from birth to approximately two years of age, is often mistaken for a congenital pulmonary airway malformation, as the two entities can be difficult to distinguish on imaging and pathology. Diagnosis of PPB should prompt workup for DICER1 syndrome, an autosomal dominant tumor predisposition syndrome. We report a newborn with a congenital PPB presenting with tachypnea and hypoxia, who was found to have variant of uncertain clinical significance (VUS) in DICER1. CASE PRESENTATION: A term female infant developed respiratory distress shortly after birth. Initial imaging was concerning for a congenital pulmonary airway malformation versus congenital diaphragmatic hernia, and she was transferred to a quaternary neonatal intensive care unit for management and workup. Chest CT angiography demonstrated a macrocytic multicystic lesion within the right lower lobe without systemic arterial supply. The pediatric surgery team was consulted, and the neonate underwent right lower lobectomy. Pathology revealed a type I PPB. Oncology and genetics consultants recommended observation without chemotherapy and single gene sequencing of DICER1, which identified a germline VUS in DICER1 predicted to alter splicing. RNA-sequencing from blood demonstrated that the variant resulted in an in-frame deletion of 29 amino acids in a majority of transcripts from the affected allele. Due to the patient's young age at presentation and high clinical suspicion for DICER1 syndrome, tumor surveillance was initiated. Renal and pelvic ultrasonography were unremarkable. CONCLUSION: We present the case of a term neonate with respiratory distress and cystic lung mass, found to have a type I PPB with a germline VUS in DICER1 that likely increased her risk of DICER1-related tumors. Nearly 70% of patients with PPB demonstrate germline mutations in DICER1. Review of RNA sequencing data demonstrates the difficulty in classifying splice variants such as this. Penetrance is low, and many patients with pathogenic DICER1 variants do not develop a malignancy. Best practice surgical and oncologic recommendations include an individualized approach and tumor board discussion. This case highlights the importance of a multidisciplinary team approach and the utility of international registries for patients with rare diagnoses.

Biobehavioral Implications of Chimeric Antigen Receptor T-cell Therapy: Current State and Future Directions.

Chimeric antigen receptor (CAR) T-cell therapy has demonstrated remarkable clinical responses in hematologic malignancies. Recent advances in CAR T-cell therapy have expanded its application into other populations including older patients and those with central nervous system and solid tumors. Although its clinical efficacy has been excellent for some malignancies, CAR T-cell therapy is associated with severe and even life-threatening immune-mediated toxicities, including cytokine release syndrome and neurotoxicity. There is a strong body of scientific evidence highlighting the connection between immune activation and neurocognitive and psychological phenomena. To date, there has been limited investigation into this relationship in the context of immunotherapy. In this review, we present a biobehavioral framework to inform current and future cellular therapy research and contribute to improving the multidimensional outcomes of patients receiving CAR T-cell therapy.

Unfavorable transcriptome profiles and social disadvantage in hematopoietic cell transplantation: a CIBMTR analysis.

Patient-reported outcomes (PROs) capture subjective social determinants of health (SDOHs), which can affect health outcomes through the stress response pathway. The conserved transcriptional response to adversity (CTRA) is a stress-mediated proinflammatory transcriptomic pattern that has been linked to adverse hematopoietic cell transplant (HCT) outcomes. This study examined the association of pretransplant CTRA with patient-reported SDOHs in allogeneic HCT recipients. In this cross-sectional study, pre-HCT SDOH-related PROs included the 36-Item Short Form Health Survey and the Functional Assessment of Cancer Therapy-Bone Marrow Transplant (FACT-BMT). CTRA was assessed by RNA sequencing of whole blood specimens, with mixed effects linear regression models relating CTRA expression to PRO scores while controlling for age, sex, race, disease, and performance status. Among 121 patients, the median age was 54 years, 42% were female, and 91% were White. CTRA was elevated in participants reporting lower scores on the FACT-BMT (P = .003), including the general (P = .003) and BMT-specific (P = .014) components. Effects were driven by the social well-being domain (P = .0001). This corresponded to an 8% to 15% difference in CTRA RNA expression across a 4 standard deviation range in patient-reported SDOHs. Ancillary bioinformatics analyses confirmed the association of well-being with reduced proinflammatory transcription pathway activity [cyclic AMP response element-binding protein, (CREB), NF-κB, and activating protein-1 (AP-1)]. In conclusion, HCT-treated patients who experience unfavorable social conditions show elevated CTRA expression in pretransplant blood samples. These data highlight the biologic sequelae of social well-being and community context and suggest a potential molecular mechanism for the impact of social gradients in HCT outcomes. Targeting this pathway could optimize outcomes in this high-risk population.

The effect of tocilizumab on patient reported outcomes and inflammatory biomarkers in hematopoietic cell transplantation.

Inflammatory physiology has been linked to behavioral and emotional symptoms in a variety of contexts and experimental paradigms. Hematopoietic cell transplantation (HCT) represents an intersection of significant immune dysregulation and psychosocial stress, and this biobehavioral relationship can influence important clinical outcomes. For those undergoing HCT with inflammation-related neuropsychiatric symptoms, using targeted agents such as the IL-6 receptor antagonist tocilizumab may be an effective therapeutic approach. We conducted an observational cohort study to explore patient reported outcomes (PROs) and inflammatory biomarkers among allogeneic HCT recipients who received tocilizumab compared to those who did not. Individuals on a larger trial of tocilizumab for prevention of graft-versus-host disease received a single dose of tocilizumab 24 h prior to stem cell infusion. Measures of anxiety, depression, pain, fatigue, and sleep quality and parallel blood samples for inflammatory cytokines were collected from participants and an analogous comparison cohort at baseline and Day 28 after stem cell infusion. Demographic and medical characteristics were reported; an analysis of covariance regression model was fitted to evaluate differences in PROs and distance correlation t-tests assessed for associations between biomarkers and PRO measures. For n = 18 tocilizumab-treated and n = 22 comparison patients, there were no significant differences between patient demographics, but the tocilizumab cohort had a different distribution of primary diagnoses (p = 0.009) with more patients with leukemias and a higher proportion of patients in their first remission (64% vs 28%, p = 0.024). Depression was higher at Day 28 compared to baseline in both groups (comparison group: +5.1 [95% CI 0.14-10, p = 0.045], tocilizumab: +8.6 [95% CI 2.3-15, p = 0.011]), though the difference between groups did not reach statistical significance. The tocilizumab group had significantly increased circulating IL-6 and decreased CRP at Day 28 (all p < 0.05). There was an association between collective baseline biomarkers and PROs (distance correlation dCor = 0.110, p = 0.005), but this same association was not present at Day 28 (dCor = -0.001, p = 0.5). In univariate analyses, a 10-fold increase in plasma IL-6 was associated with a 3.6-point higher depression score (95% CI 1.0-6.2, p = 0.008). In this exploratory analysis of PROs and inflammatory biomarkers in patients undergoing HCT, tocilizumab was not associated with favorable patient-reported symptom profiles. This finding is aligned with our prior work in the HCT population but diverges from hypothesized therapeutic effects of tocilizumab on depressive symptoms, thus highlighting the need for larger prospective translational studies in biobehavioral HCT research.

Biobehavioral Implications of Covid-19 for Transplantation and Cellular Therapy Recipients.

A growing body of literature has emphasized the importance of biobehavioral processes - defined as the interaction of behavior, psychology, socioenvironmental factors, and biological processes - for clinical outcomes among transplantation and cellular therapy (TCT) patients. TCT recipients are especially vulnerable to distress associated with pandemic conditions and represent a notably immunocompromised group at greater risk for SARS-CoV-2 infection with substantially worse outcomes. The summation of both the immunologic and psychologic vulnerability of TCT patients renders them particularly susceptible to adverse biobehavioral sequelae associated with the Covid-19 pandemic. Stress and adverse psychosocial factors alter neural and endocrine pathways through sympathetic nervous system and hypothalamic-pituitary-adrenal axis signaling that ultimately affect gene regulation in immune cells. Reciprocally, global inflammation and immune dysregulation related to TCT contribute to dysregulation of neuroendocrine and central nervous system function, resulting in the symptom profile of depression, fatigue, sleep disturbance, and cognitive dysfunction. In this article, we draw upon literature on immunology, psychology, neuroscience, hematology and oncology, Covid-19 pathophysiology, and TCT processes to discuss how they may intersect to influence TCT outcomes, with the goal of providing an overview of the significance of biobehavioral factors in understanding the relationship between Covid-19 and TCT, now and for the future. We discuss the roles of depression, anxiety, fatigue, sleep, social isolation and loneliness, and neurocognitive impairment, as well as specific implications for sub-populations of interest, including pediatrics, caregivers, and TCT donors. Finally, we address protective psychological processes that may optimize biobehavioral outcomes affected by Covid-19.

Objectifying the Subjective: The Use of Heart Rate Variability as a Psychosocial Symptom Biomarker in Hospice and Palliative Care Research.

Measuring psychosocial symptoms in hospice and palliative care research is critical to understanding the patient and caregiver experience. Subjective patient-reported outcome tools have been the primary method for collecting these data in palliative care, and the growing field of biobehavioral research offers new tools that could deepen our understanding of psychosocial symptomatology. Here we describe one psychosocial biomarker, heart rate variability (HRV), and simple techniques for measurement in an adolescent and young adult cancer population that are applicable to palliative care studies. Complementing self-reported measures with objective biomarkers like HRV could facilitate a more nuanced understanding of physiologic and perceived well-being in patients with serious or life-limiting illness and inform future "precision supportive care" in hospice and palliative medicine.

Heart rate variability and psychosocial symptoms in adolescents and young adults with cancer.

BACKGROUND: Heart Rate Variability (HRV) is a valid, scalable biomarker of stress. We aimed to examine associations between HRV and psychosocial outcomes in adolescents and young adults (AYAs) with cancer. METHODS: This was a secondary analysis of baseline data from a randomized trial testing a resilience intervention in AYAs with cancer. Two widely used HRV metrics, the standard deviation of normal to normal beats (SDNN) and root mean square of successive differences (RMSSD), were derived from electrocardiograms. Patient-reported outcome (PRO) survey measures included quality of life, anxiety, depression, distress, and resilience. Linear regression models were used to test associations between HRV and PRO scores. The Wilcoxon rank sum test was used to test differences in median HRV values among participant subgroups. RESULTS: Among the n = 76 patients with available electrocardiograms, the mean age was 16 years (SD 3y), 63% were white, and leukemia/lymphoma was the most common diagnosis. Compared to healthy adolescents, AYAs with cancer had lower median HRV (SDNN [Females: 31.9 (12.8-50.7) vs 66.4 (46.0-86.8), p<0.01; Males: 29.9 (11.5-47.9) vs 63.2 (48.4-84.6), p<0.01]; RMSSD [Females: 28.2 (11.1-45.5) vs 69.0 (49.1-99.6), p<0.01; Males: 27.9 (8.6-48.6) vs 58.7 (44.8-88.2), p<0.01]). There was no statistically significant association between PRO measures and SDNN or RMSSD in either an unadjusted or adjusted linear regression models. CONCLUSION: In this secondary analysis, we did not find an association between HRV and psychosocial PROs among AYAs with cancer. HRV measures were lower than for healthy adolescents. Larger prospective studies in AYA biopsychosocial research are needed.

The biology of stress in cancer: Applying the biobehavioral framework to adolescent and young adult oncology research.

The stress response influences the development and trajectory of cancer through a host of complex neuroimmune mechanisms. Basic, translational, and clinical research has elucidated these biobehavioral connections and offers a new paradigm for scientific investigation and patient care. Using a biobehavioral approach could offer new diagnostic and therapeutic opportunities in oncology, and this approach will be particularly impactful for adolescent and young adult (AYA) patients with cancer. To date, nearly all biobehavioral oncology research has been done in the adult population. And yet, AYAs have traditionally poorer mental health and cancer-related outcomes, and thus represent a population that could benefit from parallel psychosocial and biomedical intervention. Future biobehavioral work in oncology should focus on the AYA population, integrating new cancer therapies and technology into the next generation of research.

Bilateral Pseudo-hypopyon as Presenting Symptom of Acute Monocytic Leukemia in an 8-Month-Old Infant.

A previously healthy 8-month-old female infant presenting with lethargy and bilateral eye redness and cloudiness had bilateral hypopyon uveitis, which persisted despite topical steroids. Cytology of the anterior chamber and cerebrospinal fluid and flow cytometry of cerebrospinal fluid revealed malignant cells consistent with acute monocytic leukemia. Bone marrow aspirates and biopsies showed no evidence of disease. She was treated with systemic and intrathecal chemotherapy, with subsequent remission and resolution of pseudo-hypopyon. Anterior chamber involvement is a rare presentation of acute myeloid leukemia and may indicate concurrent central nervous system involvement. This has important therapeutic implications, because additional treatment modalities such as intrathecal chemotherapy, local chemotherapy, and ocular radiation may be required to overcome the "pharmacologic sanctuary" created by the blood-ocular barrier. [J Pediatr Ophthalmol Strabismus. 2021;58(5):e30-e33.].

Defining a "Good Death" in Pediatric Oncology: A Mixed Methods Study of Healthcare Providers.

Delivering optimal end-of-life (EOL) care to children and adolescents is a healthcare priority, yet relatively little is known about what patients, families, and healthcare providers (HCPs) consider "best" practices. The objective of this study was to identify factors that pediatric oncology HCPs consider important for EOL care. This was a cross-sectional mixed methods study. Participants were multidisciplinary pediatric oncology staff who completed surveys and participated in semi-structured qualitative interviews. Interviews were analyzed using a modified grounded theory approach. Provider statements were compared based on years of experience (≤10 or >10 years) and discipline (non-physician or physician). A total of n = 19 staff (74% female) enrolled, including physicians (n = 8), advanced practice providers (n = 4), nurses (n = 2), music/art therapists (n = 2), physical therapists (n = 1), educators (n = 1), and chaplains (n = 1). Most HCPs identified communication, symptom control, and acceptance as features of a "good" death. Compared to physicians, non-physicians focused on relationships (67% vs. 33%, p = 0.007); HCPs with ≤10 years of experience (n = 11) more frequently identified the benefits of a multidisciplinary team (74% vs. 26%, p = 0.004). This study identified many common HCP-defined components of "good" pediatric EOL care in addition to some differing perspectives depending on discipline and experience. Incorporating diverse HCP perspectives with those of the patient and family can guide contemporary high-quality pediatric EOL clinical care and education.

Trichloroethylene and trichloroacetic acid regulate calcium signaling pathways in murine embryonal carcinoma cells p19.

Trichloroethylene (TCE) and its metabolite trichloroacetic acid (TCA) are ubiquitous environmental contaminants which have been regarded as risk factors for congenital heart malformations. An increasing body of evidence from in vivo and in vitro studies supports the notion that exposure to TCE and TCA may interfere with normal embryonic heart development. The expression of several genes coding for factors implicated in the regulation of cardiac development has been shown to be modified by TCE or TCA, but the molecular mechanisms that mediate these effects are still obscure. In this study, we investigated the global changes in gene expression caused by exposure of P19 embryonal carcinoma cells to TCE and TCA, and whether or not TCE and/or TCA influence the expression levels of genes encoding for proteins that regulate calcium fluxes in cardiac cells. We report that TCE and TCA disrupt the expression of genes involved in processes important during embryonic development suggesting that exposure to environmentally significant concentrations of TCE may have deleterious effects on specific stages of cardiac differentiation.