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The aim of this study was to explore factors contributing to compassion fatigue (CF), burnout (BO), and compassion satisfaction (CS) during the severe acute respiratory syndrome coronavirus-2 pandemic in pediatric subspecialists. The Compassion Fatigue and Satisfaction Self-Test (CFST) and a questionnaire of personal/professional characteristics were distributed electronically to pediatric subspecialists. There were no significant differences in pre- and early-pandemic CF, BO, and CS scores. Nearly 40% of respondents felt their contributions to the pandemic were not valued by their institutions. Higher CF scores were significantly associated with: higher BO score; “I have put myself at increased risk through my work”; working in one’s specialty >50% of time; distress about mental health and/or future uncertainty. Higher BO scores were significantly associated with: higher CF score; “Self-care is not a priority”; emotional depletion. Higher CS scores were significantly associated with: “My institution values my contribution to the COVID-19 crisis”; workplace debriefs; pet therapy. The pandemic has only increased the need for physicians to receive social/emotional support from their institution and to feel their workplace contributions are valued. Successful pre-pandemic workplace interventions may not adequately support physicians during the pandemic. Further study is needed to identify supports that best counter the pandemic’s unprecedented challenges.

Background While institution-sponsored wellness programs may be effective, little is known about their availability and utilization in pediatric subspecialists, and about programs physicians wish were available. Methods A survey of perceptions about, and availability and utilization of institutional wellness activities, was distributed electronically to pediatric subspecialists nationally. Bivariate analyses were performed using χ2 tests or independent t tests. Multivariable logistic regression models for categories of institution-sponsored programming as a function of potential predictors of program utilization were performed. Qualitative content analysis was performed for free-text survey answers. Results Approximately 60% of respondents participated in institution-sponsored wellness opportunities. Debriefs, Schwartz Center Rounds, mental health services, and team building events were the most available institution-sponsored wellness activities, whereas debriefs, team building, Schwartz Center Rounds, and pet therapy were most frequently utilized. Respondents desired greater social/emotional support, improved leadership, enhanced organizational support, and modifications to the physical work environment, with no significant differences across subspecialties for "wish list" items. Conclusions Physician wellness requires more than a "one-size-fits-all" initiative. Our data highlight the importance of encouraging and normalizing self-care practices, and of listening to what physicians articulate about their needs. Pre-implementation needs assessment allows a "bottom-up" approach where physician voices can be heard.

Existential suffering encompasses a broad set of experiences and concerns. These are often difficult to define but generally involve a sense of loss of anchoring in the world and a loss of meaning, along with a sense of threatened personal identity. Often the idea of existential suffering overlaps with ideas of spiritual distress, psychological distress, psychosocial distress, and physical suffering. Existential suffering may be experienced by children, parents, and siblings as well as by staff members involved in the care of children with serious illness. Addressing existential suffering in any context requires an interdisciplinary approach, highlighting the importance of the interdisciplinary pediatric palliative care team and allied partners.

Care for pediatric patients with serious or potentially life-limiting illness involves the interplay of multiple medical and surgical teams within the hospital. Pediatric surgeons are capable of performing procedures that can improve the quality of life for children facing serious illness, but which also carry the potential for significant risk and burden. Patients and families are often faced with decisions about invasive surgical procedures and interventions, stressing the need for seamless collaboration between palliative care and surgical providers. Equally important is the need for clear and open-ended communication with patients and families by all medical teams to determine if potential surgical procedures and interventions align with their goals and to ensure that the perceived benefits of interventions outweigh any risks. Over the last two decades, pediatric palliative care has grown into a thriving medical subspecialty Despite the importance of collaborative care, there is lack of literature on the interaction of pediatric surgery and palliative care and the role of pediatric surgeons in providing primary palliative care. This review defines surgical pediatric palliative care, and provides an in-depth discussion of the unique complexities involved in caring for children with serious and potentially life-limiting illness, while highlighting specific challenges through detailed case presentations.

Background: The experience of starting and growing a pediatric palliative care program (PPCP) has changed over the last 10 years as rapid increases of patient volume have amplified challenges relat...

BACKGROUND: The role of cystic fibrosis (CF) care team members in delivering palliative care (PC) remains undefined. We aimed to understand the PC skills of CF care teams. METHODS: CF care team members (“clinicians”), adults with CF (“patients”), and family caregivers (“caregivers”) rated the ability of CF clinicians to provide aspects of PC using a five-point scale (“poor” to “excellent”). Median ratings were compared between groups. RESULTS: A total of 70 patients, 100 caregivers, and 350 clinicians participated. Clinicians consistently rated their PC skills higher than patients or caregivers rated them, particularly for advanced PC skills. While clinicians, patients, and caregivers rated clinicians as “very good” at basic pain assessment and “good” at discussing prognostic uncertainty, clinicians rated themselves more highly at providing most skills, including simultaneous PC and standard CF care (P < .0001), basic depression assessment (P < .001), and discussing transplant, advance directives, end of life, code status, and hospice (all P < .0001). Respondents affiliated with adult CF care teams rated clinicians more highly than respondents affiliated with pediatric CF care teams at discussing lung transplant (P < .001), end of life (P = .006), advance directives (P < .001), code status (P = .012), and hospice (P = .016). Most patients (69%) and caregivers (60%) felt CF clinicians should receive more PC training. CONCLUSIONS: Discrepancies exist among patient/caregiver and clinician perceptions of PC skills in CF, and skills of adult and pediatric teams may differ. Patients and caregivers feel clinicians’ more advanced PC skills are lacking. CF clinicians may benefit from PC training to enhance skills and to understand how and when to utilize specialty PC services.

Context Supporting patients' spiritual needs is central to palliative care. Adolescents and young adults (AYAs) may be developing their spiritual identities; it is unclear how to navigate conversations concerning their spiritual needs. Objectives To 1) describe spiritual narratives among AYAs based on their self-identification as religious, spiritual, both, or neither and 2) identify language to support AYAs' spiritual needs in keeping with their self-identities. Methods In this mixed-methods, prospective, longitudinal cohort study, AYAs (14–25 years old) with newly diagnosed cancer self-reported their "religiousness" and "spirituality." One-on-one, semistructured interviews were conducted at three time points (within 60 days of diagnosis, six to 12 months, and 12–18 months later) and included queries about spirituality, God/prayer, meaning from illness, and evolving self-identity. Post hoc directed content analysis informed a framework for approaching religious/spiritual discussions. Results Seventeen AYAs (mean age 17.1 years, SD = 2.7, 47% male) participated in 44 interviews. Of n = 16 with concurrent survey responses, five (31%) self-identified as both "religious and spiritual," five (31%) as "spiritual, not religious," one (6%) as "religious, not spiritual," and five (31%) as neither. Those who endorsed religiousness tended to cite faith as a source of strength, whereas many who declined this self-identity explicitly questioned their preexisting beliefs. Regardless of self-identified "religiousness" or "spirituality," most participants endorsed quests for meaning, purpose, and/or legacy, and all included constructs of hope in their narratives. Conclusion AYA self-identities evolve during the illness experience. When words such as "religion" and "spirituality" do not fit, explicitly exploring hopes, worries, meaning, and changing life perspectives may be a promising alternative.

We examine the discussions generated to date by the Charlie Gard case, as well as the events of the case itself, in order to examine lessons for providers dealing with similar situations in the future. Publications regarding the Gard case are relatively few and focus primarily on the ethical and legal issues that arise when involving the court system in complex medical decision-making and potential limits to parental authority. Some publications have also addressed the subject of experimental therapies, especially from the perspective of potential harms, suffering, and cost. We suggest early introduction of palliative care and careful attention to communication might reduce conflict and improve satisfaction for all involved parties. Likewise, we suggest limiting court system to truly extraordinary circumstances; all efforts should be made to avoid legal action and to honor and respect parental authority.

ObjectiveCompassion fatigue (CF) is secondary traumatic distress experienced by providers from contact with patients' suffering. Burnout (BO) is job-related distress resulting from uncontrollable workplace factors that manifest in career dissatisfaction. Compassion satisfaction (CS) is emotional fulfillment derived from caring for others. The literature on BO in healthcare providers is extensive, whereas CF and CS have not been comprehensively studied. Because of ongoing exposure to patient and family distress, pediatric palliative care (PPC) providers may be at particular risk for CF. We conducted a cross-sectional pilot study of CF, BO, and CS among PPC providers across the United States.MethodThe Compassion Fatigue and Satisfaction Self-Test for Helpers and a questionnaire of professional and personal characteristics were distributed electronically and anonymously to PPC physicians and nurses. Logistic and linear regression models for CF, BO, and CS as a function of potential risk factors were constructed.ResultsThe survey response rate was 39%, primarily consisting of female, Caucasian providers. The prevalence of CF, BO, and CS was 18%, 12%, and 25%, respectively. Distress about a “clinical situation,” physical exhaustion, and personal loss were identified as significant determinants of CF. Distress about “coworkers,” emotional depletion, social isolation, and “recent involvement in a clinical situation in which life-prolonging activities were not introduced” were significant determinants of BO. Physical exhaustion, personal history of trauma, “recent involvement in a clinical situation in which life-prolonging activities were not introduced,” and not discussing distressing issues were significant predictors of lower CS scores.Significance of resultsCF and BO directly influence the well-being and professional performance of PPC providers. To provide effective compassionate care to patients, PPC providers must be attentive to predictors of these phenomena. Further work is needed to explore additional causes of CF, BO, and CS in PPC providers as well as potential interventions.

Effective pain management plays a frequent and central role in palliative care, regardless of setting. This chapter addresses assessment of pain in both children and adults, as well as approaches to thoughtful and ongoing management of pain, including basic analgesics, opioid analgesics, adjuvant medications, and integrative therapies.

Although humanitarian crises around the world show no signs of abating, and a number of factors, including climate change and recalcitrant conflicts, seem poised to continue driving and even increasing the frequency of crises in coming years, the scale and capability of international aid efforts has nonetheless grown with time. Humanitarian crises, as defined by the World Health Organization, are large-scale events that affect populations and may include massive loss of life, disruption of livelihood, breakdown of society, forced displacement, and other severe political, economic, social, psychological and spiritual effects. Such crises can take many forms: natural disasters such as hurricanes and earthquakes, disease outbreaks (e.g., Ebola), and international refugee crises sparked by war, violence, or famine. Given this variety and complexity, the international responses to crises must, to some extent, be tailored to the specific circumstances. This chapter looks at the rationale for including palliative care in healthcare responses to humanitarian crises.

Children represent a particularly vulnerable population in any humanitarian crisis. This chapter draws attention to some of the special vulnerabilities children experience so that clinicians may be more aware in addressing them. In addition, this chapter focuses on a number of aspects of pediatric care that practitioners more familiar with the care of adults may be less familiar with, including communicating with children (especially difficult news), evaluating pain and symptoms in children (who may be nonverbal or noncommunicative), and guidelines around medical management of pain and symptoms, especially in care of the dying child. A number of other chapters are cross-referenced where relevant.

Compassion fatigue (CF) is distress experienced by caregivers from ongoing contact with patients who are suffering. Burnout (BO) is occupational stress directly related to dissonance between job demands and available resources. Compassion satisfaction (CS) is professional fulfillment experienced through helping others. CF in physicians is not well studied. Neonatologists may be at particular risk for CF by virtue of recurrent exposure to distress in patients and their families. The objectives of this study were to determine the prevalence of CF, BO and CS, and to identify potential predictors for these phenomena in neonatologists. A modified Compassion Fatigue and Satisfaction Self-Test and a questionnaire of professional details and personal characteristics were distributed electronically to neonatologists nationally. Multivariable logistic and linear regression models for CF, BO and CS as a function of potential predictors were constructed. The survey response rate was 47%. The prevalence of CF, BO and CS was 15.7, 20.8 and 21.9%, respectively. Female gender, emotional depletion, distress from ‘a clinical situation’, ‘co-workers’, ‘personal health issues’ and ‘not talking about distressing issues’ were each significant determinants of CF. Emotional depletion, distress from the ‘physical work environment’ and ‘co-workers’, and ‘not talking about distressing issues’ were significant determinants of BO. Self-identification as Hispanic; ‘not currently feeling distressed’; talking about distressing issues; and utilization of pediatric palliative care services were significant determinants of higher CS. CF and BO may impact emotional well-being and professional performance of neonatologists. Enhancement of CS is a potential target for intervention.

Context The hospital is a place full of distress and questions about the meaning of life. The death of a child can cause a spiritual struggle and crisis. Therefore, it is necessary for health care providers in the neonatal intensive care unit (NICU) to assess the spiritual needs of families that have lost a child. Objectives The purpose of this study was to explore the spiritual needs of families in Iran at the end of their baby's life and through bereavement in the NICU. Methods This study was an exploratory qualitative study performed using purposeful sampling and semi-structured interviews with 24 participants. Inclusion criteria for families, nurses, and physicians included having experienced at least one newborn death in the last six months in the NICU. The research environment was the NICU in Isfahan, one of the largest cities in Iran. Results Data analysis revealed three main themes: spiritual belief in a supernatural power, the need for comfort of the soul, and human dignity for the newborn. Conclusion The results of this study created a new vision in addressing spiritual needs of Iranian families who experience the death of a newborn.

To determine the prevalence of compassion fatigue, burnout, and compassion satisfaction and identify potential personal and professional predictors of these phenomena in pediatric critical care providers.Cross-sectional, online survey.Pediatric critical care practices in the United States.Pediatric critical care fellows and attending physicians.None.A modified Compassion Fatigue and Satisfaction Self-Test for Helpers and a questionnaire of personal and professional characteristics were distributed electronically to pediatric critical care physicians nationally. Prevalence of these phenomena was calculated. Hierarchical linear regression models for compassion fatigue, burnout, and compassion satisfaction as a function of potential risk factors were constructed. The survey response rate was 35.7%. The prevalence of compassion fatigue, burnout, and compassion satisfaction was 25.7%, 23.2%, 16.8%, respectively. Burnout score, emotional depletion, and distress about a patient and/or the physical work environment were each significant determinants of higher Compassion Fatigue scores. Preparing for didactics, Compassion Fatigue score, distress about administrative issues and/or coworkers, and "self-care is not a priority" were each significant determinants of higher burnout scores, whereas female sex, Compassion Satisfaction score, and distress about the physical work environment were each significant determinants of lower burnout scores. Prayer/meditation, talking with colleagues, senior faculty level, and student and/or chaplain involvement when delivering bad news were each significant predictors of higher Compassion Satisfaction scores, whereas female sex, burnout score, emotional depletion, and distress about coworkers were each significant predictors of lower Compassion Satisfaction scores.In our population, chronic exposure to distress in patients and families puts pediatric critical care physicians at risk for compassion fatigue and low compassion satisfaction. Awareness of compassion fatigue, burnout, and compassion satisfaction and their predictors may benefit providers both personally and professionally by allowing them to proactively manage their distress.

Objectives The objective was to determine the prevalence of compassion fatigue (CF), burnout (BO), and compassion satisfaction (CS) and identify potential personal and professional predictors of these phenomena in pediatric emergency medicine (PEM) physicians. Methods A modified Compassion Fatigue and Satisfaction Self-Test for Helpers and a questionnaire of personal and professional characteristics were distributed electronically to PEM physicians nationally. The prevalence of these phenomena was calculated. Hierarchical linear regression models for CF, BO, and CS as a function of potential risk factors were constructed. Results The final analyzable survey rate represented 22.7% of the physicians invited to participate. The prevalences of CF, BO, and CS were 16.4, 21.5, and 18.5%, respectively. BO score, distress about a "clinical situation," "physical work environment," and engaging in prayer/meditation were each significant determinants of higher CF scores, whereas "socializing with family/friends" was significantly associated with lower CF scores. CF score, emotional depletion, and distress due to "coworkers" were each significant determinants of higher BO scores, whereas CS score and "talking with a family member" as a means of self-care were significantly associated with lower BO scores. Socializing with family/friends and >20 years as PEM provider were each significant determinants of higher CS scores, whereas BO score, emotional depletion, distress about the physical work environment and "administrative issues," 10% to 24% of time spent caring for pediatric patients, and "talking with life partner" about work-related distress were each significant determinants of lower CS scores. We acknowledge that the generalizability of our findings is limited by the sample size and by the fact that participants were largely female, Caucasian, and junior faculty and worked in academic medical centers. Conclusions PEM physicians are at risk for developing CF, BO, and low CS. Proactive awareness of these phenomena and their predictors may allow providers to better manage the unique challenges and emotional stressors of the pediatric ED to enhance personal well-being and professional performance.

Ewing sarcoma (ES) is the second most common bone tumor in children. Current chemotherapeutic regimens include high-dose anthracyclines and alkylating agents with significant variation in treatment length. The Memorial Sloan Kettering Cancer Center P6 regimen (MSKCC P6) treatment protocol is a highly aggressive regimen given over 21 weeks only. We present the outcome of ES patients treated in our center with this protocol over the last 15 years.We retrospectively analyzed data on the presentation, patient characteristics, treatment, and outcome of all ES patients treated according to the MSKCC P6 regimen from 1999 to 2014.Of 48 patients, 37 (77%) presented with a nonmetastatic disease and 26 (54%) with tumor located in the extremities. The 5-year overall survival (OS) of the entire cohort was 55.9% ± 8%. Nonmetastatic disease conferred a better prognosis with a 5-year OS of 68.4% ± 8.5%. Patients with a nonmetastatic extremity tumor had the most favorable outcome with 5-year OS of 72.2% ± 9.8%.The outcome of ES patients after a short aggressive course of chemotherapy (the MSKCC P6 protocol), is comparable to that following other first-line treatment regimens in use, with potentially fewer long-term adverse events.

Oral mucositis is a common complication of cancer therapy. Animal models suggest that curcumin may prevent oral mucositis. To date, no clinical studies have been reported.The primary aim of this pilot study was to assess the tolerability of a curcumin mouthwash. The secondary aim was to describe oral mucositis in pediatric patients undergoing doxorubicin-containing chemotherapy who were using the curcumin mouthwash.The research team had originally designed a placebo-controlled study, but gastrointestinal adverse events (nausea and vomiting) affected the compliance of the first three participants who entered the study. An independent researcher found that all three had received the placebo. Believing it unethical to continue using the study's original design, the research team discontinued the control group, and the resulting study is comparable to a case series.The research team performed the study at Hadassah University Medical Center in Jerusalem, Israel.Participants were seven pediatric and young-adult oncology patients.In addition to standard, preventive oral care (chlorhexidine 0.2% mouthwash for 30 s twice per day), participants also used 10 drops of Curcumall twice per day in a mouthwash during treatment with highdose chemotherapy.Oral mucositis was assessed on days 0, 7, 10, 14, and 21. The World Health Organization (WHO) scale, the Oral Mucositis Assessment Scale (OMAS), and a Visual Analog pain scale (VAS; patient reporting scale of 0-10) were used. Adverse events were tracked.No oral adverse events were documented. No systemic adverse events that possibly could be related to the use of the curcumin mouthwash were observed. In the four patients who fulfilled the compliance criteria, the WHO, OMAS and VAS scores were lower than the severity of oral mucositis previously reported in the literature. Four out of the five participants developed OM, but the values were low, reflecting a relatively mild case.In this study, the research team suggested that curcumin mouthwash was safe and well-tolerated. More research is warranted about the efficacy of topical curcumin in the prevention of oral mucositis.

Over the past two decades, paediatric palliative care has emerged as both a primary approach and as its own medical subspecialty, the overall aim of which is to ease suffering for children with life-threatening illness and their families through a concurrent model of care. However, most discussions have been focused on the transition to palliative care when no realistic hope for cure exists. We believe that, because the course of cancer is so unpredictable, this idea is misleading. Indeed, palliative care is increasingly being recognized as being about not just how to cope with the process of dying, but also about how to engage in living when faced with a life-threatening illness. This article will examine our current understanding of several areas of palliative care, with the ultimate message that palliative care is simply a novel term for the total care of a child and family, an approach that should be applied consistently and concurrently regardless of disease status. By improving familiarity with palliative care and building relationships with palliative care specialists, the paediatric oncology clinician will ensure that the best care possible for children and families is provided, regardless of outcome.

Infants with 4s neuroblastoma (NB) and massive hepatomegaly have a guarded prognosis and mortality approaches 30%. We report on eight patients with 4s NB and massive hepatomegaly treated with multiple modalities. One patient had spontaneous tumor regression. Three patients had progressive disease and responded to chemotherapy. Four patients progressed despite intravenous chemotherapy, of whom two died, and two were salvaged with hepatic intra-arterial chemoembolization. Treatment of infants with stage 4s NB with massive hepatomegaly should be individualized based on disease course. A sequential approach with observation, intravenous chemotherapy, and intra-arterial chemoembolization, may improve the outcome of these infants. Pediatr Blood Cancer 2012; 59: 182–184. © 2011 Wiley Periodicals, Inc.

Children with Down syndrome (DS) have a unique form of acute megakaryocytic leukemia (AMKL) characterized by the presence of mutations in the GATA1 gene leading to increased chemosensitivity and a favorable outcome. We describe an 8-month-old male with DS who was diagnosed with AMKL without a mutation in the GATA1 gene. The patient was treated according to the DS-AML-regimen but his disease progressed and he succumbed 9 months later. This rare case of DS AMKL without a GATA1 mutation with an unfavorable outcome suggests that GATA1 testing may play a useful role in initial stratification. Pediatr Blood Cancer 2010;54:1048–1049 © 2010 Wiley-Liss, Inc.

We describe a 12-year-old boy male who presented with an expressive dysphasia after completion of treatment for unifocal Ewing sarcoma. CNS vasculitis was diagnosed by MRI/MRA and cerebral angiography. Extensive rheumatologic work-up failed to identify an underlying primary process. Restaging studies showed no evidence of tumor. Complete neurologic recovery was achieved on prednisone. Four months later the patient developed overt, extensive metastases, confirmed by biopsy to represent recurrent Ewing sarcoma. Despite intensive therapy the patient succumbed 6 months later. This case demonstrates the unique finding of isolated CNS vasculitis as a presenting sign of Ewing sarcoma. Pediatr Blood Cancer 2010;54:326–328. © 2009 Wiley-Liss, Inc.

The alpha4beta7 integrin plays a central role in the homing of T cells to the gut. We hypothesized that absence of the beta7 subunit would result in a reduction of intestinal graft-versus-host disease (GVHD) and an improvement in overall GVHD morbidity and mortality in recipients of hematopoietic stem cell transplantation (HSCT). Analysis of alloreactive beta7-/- T cells showed intact activation, proliferation, cytokine production, and cytotoxicity. However, recipients of beta7-/- donor T cells in murine HSCT models experienced less GVHD morbidity and mortality than recipients of wild-type (WT) T cells, associated with a decrease in donor T-cell infiltration of the liver and intestine and with an overall significant decrease in hepatic and intestinal GVHD. In graft-versus-tumor (GVT) experiments, we demonstrated intact or even enhanced GVT activity of beta7-/- donor T cells. In conclusion, beta7-/- donor T cells caused less GVHD morbidity and mortality than WT donor T cells because of selectively decreased T-cell infiltration of the liver and intestines. Our data suggest that strategies to target the beta7 integrin have the clinical potential to alleviate or prevent GVHD while sparing or potentiating GVT activity.

A recent issue of Bone Marrow Transplantation included the results of a clinical trial from Minnesota of 15 pediatric patients who were transplanted with umbilical cord blood in combination with pre-expanded MSCs in an attempt to accelerate hematopoietic recovery.1 According to our present understanding, MSCs, osteoblasts and other stromal cells, including sinusoidal and endothelial, are responsible for supporting hematopoiesis and controlling HSC number. Therefore a co-transplantation of these cells, together with HSC, can be more effective in the reconstitution of hematopoiesis. This approach is especially attractive for cases with a predicted poor engraftment due to both an insufficient number of transplanted HSCs or impaired stroma.

Combination of umbilical cord blood with BM from a 2-month-old sibling as lifesaving BMT for very severe aplastic anemia

KGF is a fibroblast growth factor family member (FGF-7) that mediates epithelial cell proliferation and differentiation in a variety of tissues, including thymic epithelial cells. Recent studies have demonstrated that KGF administration (before conditioning) to the recipients of allogeneic bone marrow transplantation (BMT) can enhance T cell and thymic reconstitution. Therefore, we studied the role of KGF on T cell development under normal and stress conditions (such as irradiation) by using KGF (−/−) mice in experimental murine models. Phenotypic analysis of KGF (−/−) mice at varying ages demonstrated that the bone marrow, thymus and lymph node cellularity and the cell distribution among KGF (−/−), wild type (WT) and KGF (+/−) mice (6–11 weeks of age) were similar. However, splenic cellularity and splenic T cell numbers were slightly lower than WT and littermate controls. KGF (−/−) mice are more vulnerable to sublethal irradiation (450–600 cGy) and a more than six fold decrease was found in thymic cellularity when analyzed on day 28 after irradiation, whereas there was no delay in the erythroid, myeloid and platelet recovery after irradiation. We used bone marrow transplantation models to assess the relative contribution of KGF produced by thymocytes or thymic epithelial cells during thymic regeneration after irradiation. T cell reconstitution was impaired in syngeneic or allogeneic KGF (−/−) BMT recipients in comparison to littermate controls but there was no difference in the distribution of thymocyte subsets or splenic T cell content. The recipients of KGF (−/−) bone marrow had decreased thymic and splenic cellularity after allogeneic BMT. These data demonstrate that both donor and host derived KGF play a role in thymic regeneration. Finally, KGF administration to young and old mice (10 month old) enhanced thymopoiesis when analyzed 28 days after KGF administration. Pre-BMT KGF administration to the recipients of syngeneic and allogeneic BMT also resulted in a 2–6 fold increase in the thymic cellularity compared to the control group. We conclude that KGF produced by both thymocytes and epithelial cells is not required for normal and post-natal thymic development, but plays a role in post-natal thymic regeneration after irradiation. These data support the potential use of KGF to protect or restore thymic damage after chemo/radiotherapy.