Long-term sequelae of autologous bone marrow or peripheral stem cell transplantation for lymphoid malignancies

Incidence and risk factors of opportunistic infections after autologous stem cell transplantation: a nationwide, population-based cohort study in Korea

Several guidelines classify autologous stem cell transplantation (ASCT) as a low to intermediate risk group for infection. In a nationwide population-based study, using the Korean Health Insurance Review and Assessment Service database, patients with lymphoma and multiple myeloma (MM) who underwent ASCT from 2002 to 2016 were retrospectively analyzed. Cumulative incidence rates (CIRs) and risk factors of opportunistic infections were investigated. CIRs of fungal, Varicella zoster virus (VZV), cytomegalovirus (CMV), and Pneumocystis jirovecii infections in lymphoma were 7.9%, 16.0%, 7.4%, and 5.1%, respectively, and CIRs in MM were 6.3%, 19.1%, 4.2%, and 5.6%, respectively. Fungal infection was significantly higher in patients with previous infection (Hazard ratio (HR) 2.003, p = 0.005) in lymphoma. Incidence of CMV infection was significantly higher in patients with prior CMV infection: HR 4.920, p < 0.001 (lymphoma); HR 3.022, p = 0.030 (MM). VZV infection was significantly lower in patients receiving prophylaxis: HR 0.082, p < 0.001 (lymphoma); HR 0.096, p < 0.001 (MM). For P. jirovecii infection, busulfex and melphalan conditioning (HR 1.875, p = 0.032) and previous P. jirovecii infection (HR 4.810, p < 0.001) had a higher incidence in MM. Patients who underwent ASCT should receive VZV prophylaxis and prophylaxis for fungal and P. jirovecii may be considered in patients with previous same infection.

Prevalence and Determinants of Return to Work as a Patient-Centered Outcome in Survivors of Hematopoietic Cell Transplantation

PURPOSE OF REVIEW

Employment is an important indicator of health and functional recovery for hematopoietic cell transplantation (HCT) survivors and has significant social and economic impacts. Cancer survivors treated with conventional non-HCT therapy are known to be at a higher risk of unemployment or not returning to work after completion of therapy compared with the control population. However, the literature on return-to-work challenges among HCT survivors remains limited.

RECENT FINDINGS

Here we summarize the evidence on prevalence and determinants of return-to-work challenges among HCT survivors using previously published literature. Findings from previously published research show that return to work or unemployment is a major concern among HCT survivors, especially for allogeneic HCT recipients, and prior studies have identified several modifiable risk factors associated with it. Survivors' post-HCT employment status is significantly associated with quality of life, impacting physical, emotional, social, and financial aspects of their lives. We also highlight the gaps in current knowledge such as limited information on employment outcomes of childhood, adolescent, and young adult HCT survivors; work-related challenges among employed HCT survivors; consequences of work-related challenges; and interventions to improve return to work among HCT survivors. Findings highlighted in this review make a strong case of a multidisciplinary return-to-work support for HCT survivors to properly address their needs.

Preventing Varicella-Zoster: Advances With the Recombinant Zoster Vaccine

Prevention strategies against varicella zoster infection include chemoprophylaxis with acyclovir and live attenuated zoster vaccine. However, resistance to acyclovir has been problematic, and safety concerns have limited the use of the live attenuated vaccine in immunosuppressed patients. Recombinant zoster vaccine, made available in 2017 for the immunocompetent host, has been evaluated for safety, immunogenicity, and efficacy in several immunocompromised settings as well. The present review compares the live attenuated vaccine and the recombinant zoster vaccine and highlights data on the use of recombinant zoster vaccine in different immunocompromised states. Robust data are available for the safety, immunogenicity, and efficacy of the recombinant vaccine in the autologous stem cell population, particularly among patients with multiple myeloma. The vaccine appears safe and immunogenic in populations including those with cancer (solid tumors and hematologic malignancies), HIV-infected patients, and renal transplant recipients. Efficacy and safety data in other populations are awaited before use of the recombinant vaccine can be more widespread. It is anticipated that an increased use of the recombinant zoster vaccine, particularly in immunosuppressed patients, would lead to a decreased use of acyclovir prophylaxis.

Inactivated varicella zoster vaccine in autologous haemopoietic stem-cell transplant recipients: an international, multicentre, randomised, double-blind, placebo-controlled trial

BACKGROUND

Recipients of autologous haemopoietic stem-cell transplants (auto-HSCT) have an increased risk of herpes zoster and herpes zoster-related complications. The aim of this study was to establish the efficacy and safety of an inactivated varicella zoster vaccine for the prevention of herpes zoster after auto-HSCT.

METHODS

In this randomised, double-blind, placebo-controlled phase 3 trial, participants were recruited from 135 medical centres (ie, stem-cell transplant centres and hospitals) in North America, South America, Europe, and Asia. Patients were eligible if they were aged 18 years or older, scheduled to receive an auto-HSCT within 60 days of enrolment, and had a history of varicella infection or were seropositive for antibodies to varicella zoster virus, or both. Exclusion criteria included a history of herpes zoster within the previous year of enrolment, and intended antiviral prophylaxis for longer than 6 months after transplantation. Participants were randomly assigned according to a central randomisation schedule generated by the trial statistician, to receive either the inactivated-virus vaccine from one of three consistency lots, a high-antigen lot, or placebo, stratified by age (<50 vs ≥50 years) and intended duration of antiviral prophylaxis after transplantation (≤3 months vs >3 to ≤6 months). Participants, investigators, trial staff, and the funder's clinical and laboratory personnel were masked to group assignment. Participants were given four doses of inactivated vaccine or placebo, with the first dose 5-60 days before auto-HSCT, and the second, third, and fourth doses at about 30, 60, and 90 days after transplantation. The primary efficacy endpoint was the incidence of herpes zoster, confirmed by PCR or adjudication by a masked clinical committee, or both, assessed in all participants randomly assigned to the vaccine consistency lot group or placebo group who received at least one dose of vaccine and had auto-HSCT. Safety was assessed in all randomised participants who received at least one dose of vaccine and had follow-up data. A prespecified vaccine efficacy success criterion required the lower bound of the 95% CI be higher than 25% for the relative reduction of the hazard ratio of herpes zoster infection in participants given the vaccine from one of the consistency lots compared with those given placebo. This trial is registered on ClinicalTrials.gov (NCT01229267) and EudraCT (2010-020150-34).

FINDINGS

Between Dec 7, 2010, and April 25, 2013, 560 participants were randomly assigned to the vaccine consistency lot group, 106 to the high-antigen lot group, and 564 to the placebo group. 249 (44%) of patients in the vaccine consistency lot group, 35 (33%) in the high-antigen lot group, and 220 (39%) in the placebo group discontinued before study end, mostly because of death or withdrawal. 51 participants were excluded from the primary efficacy endpoint analyses because they did not undergo auto-HSCT or were not vaccinated, or both (22 [4%] in the vaccine consistency lot group, and 29 [5%] in the placebo group). Mean follow-up for efficacy was 2·4 years (SD 1·3) in the vaccine consistency lot group and 2·3 years (SD 1·3) in the placebo group. 42 (8%) of 538 participants in the vaccine consistency lot group (32·9 per 1000 person-years) and 113 (21%) of 535 in the placebo group (91·9 per 1000 person-years) had a confirmed case of herpes zoster. The estimated vaccine efficacy was 63·8% (95% CI 48·4-74·6), meeting the pre-specified success criterion. For the combined vaccine groups versus the placebo group, the proportion of patients with serious adverse events (216 [33%] of 657 vs 181 [33%] of 554; risk difference 0·2%, 95% CI -5·1 to 5·5) and serious vaccine-related adverse events (five [1%] vs five [1%]; risk difference 0·1%, -1·4 to 1·1) were similar. Vaccine-related injection-site adverse events occurred more frequently in participants given vaccine than those given placebo (191 [29%] vs 36 [7%]; risk difference 22·6%, 95% CI 18·5-26·6; p<0·0001).

INTERPRETATION

This study shows for the first time in a large phase 3 trial that early vaccination of auto-HSCT recipients during the peri-transplant period can be effective for the prevention of an opportunistic infection like herpes zoster and that the vaccine is well tolerated.

FUNDING

Merck & Co., Inc.

Impact of pre-transplant depression on outcomes of allogeneic and autologous hematopoietic stem cell transplantation

BACKGROUND

To evaluate the impact of depression before autologous and allogeneic hematopoietic cell transplantation (HCT) on clinical outcomes post-transplantation.

METHODS

We analyzed data from the Center for International Blood and Marrow Transplant Research to compare outcomes after autologous (n = 3786) or allogeneic (n = 7433) HCT for adult patients with hematologic malignancies with an existing diagnosis of pre-HCT depression requiring treatment versus those without pre-HCT depression. Using Cox regression models, we compared overall survival (OS) between patients with or without depression. We compared the number of days alive and out of the hospital in the first 100 days post-HCT using Poisson models. We also compared the incidence of grade 2-4 acute and chronic graft-versus-host disease (GVHD) in allogeneic HCT.

RESULTS

The study included 1116 (15%) patients with pre-transplant depression and 6317 (85%) without depression who underwent allogeneic HCT between 2008 and 2012. Pre-transplant depression was associated with lower OS (hazard ratio [HR], 1.13; 95% confidence interval [CI], 1.04-1.23; P = 0.004) and a higher incidence of grade 2-4 acute GVHD (HR, 1.25; 95% CI, 1.14-1.37; P < 0.0001), but similar incidence of chronic GVHD. Pre-transplant depression was associated with fewer days-alive-and-out-of-the hospital (means ratio [MR] = 0.97; 95% CI, 0.95-0.99; P = 0.004). There were 512 (13.5%) patients with Pre-transplant depression and 3274 (86.5%) without depression who underwent autologous HCT. Pre-transplant depression in autologous HCT was not associated with OS (HR, 1.15; 95% CI, 0.98-1.34; P = 0.096) but was associated with fewer days alive and out of the hospital (MR, 0.98; 95% CI, 0.97-0.99; P = 0.002).

CONCLUSION

Pre-transplant depression was associated with lower OS and higher risk of acute GVHD among allogeneic HCT recipients and fewer days alive and out of the hospital during the first 100 days after autologous and allogeneic HCT. Patients with pre-transplant depression represent a population that is at risk for post-transplant complications. Cancer 2017;123:1828-1838. © 2017 American Cancer Society.

Herpes Zoster in Autologous Hematopoietic Cell Transplant Recipients in the Era of Acyclovir or Valacyclovir Prophylaxis and Novel Treatment and Maintenance Therapies

The epidemiology of herpes zoster (HZ) in contemporary autologous hematopoietic cell transplant (HCT) recipients, and the impact of acyclovir (ACV)/valacyclovir (VACV) prophylaxis, is not well described. In this observational study from 2002 to 2010, we retrospectively identified 1000 varicella zoster virus (VZV)-seropositive autologous HCT recipients with up to 5 years of follow-up. The incidence of HZ and use of ACV/VACV prophylaxis were determined through review of medical records and mailed questionnaires. Risk factors for HZ were determined by multivariable Cox regression. Over a period of 5 years after autologous HCT, 194 patients developed at least 1 HZ episode, with a cumulative incidence of 21%; 159 of 194 (82%) were not on prophylaxis at the time of HZ. A second episode of HZ occurred in 31 of 194 (16%) patients. Patients taking ACV/VACV had reduced risk for HZ (adjusted hazard ratio [aHR], .59; 95% confidence interval [CI], .37 to .91), whereas those older than the median age (≥55.5 years) had increased risk (aHR, 1.42; 95% CI, 1.05 to 1.9). Disseminated VZV was reported in 8% and postherpetic neuralgia in 13% of patients. We demonstrate a high burden of HZ late after autologous HCT, despite long-term antiviral prophylaxis. Improved prevention strategies are needed to provide sustained protection against HZ after autologous HCT.

Oral complications and management strategies for patients undergoing cancer therapy

With cancer survival rate climbing up over the past three decades, quality of life for cancer patients has become an issue of major concern. Oral health plays an important part in one's overall quality of life. However, oral health status can be severely hampered by side effects of cancer therapies including surgery, chemotherapy, radiotherapy, and hematopoietic stem cell transplantation. Moreover, prevention and treatment of these complications are often overlooked in clinical practice. The present paper aims at drawing health care professionals' attention to oral complications associated with cancer therapy by giving a comprehensive review. Brief comments on contemporary cancer therapies will be given first, followed by detailed description of oral complications associated with cancer therapy. Finally, a summary of preventive strategies and treatment options for common oral complications including oral mucositis, oral infections, xerostomia, and dysgeusia will be given.

Oral epithelial dysplasia and squamous cell carcinoma following allogeneic hematopoietic stem cell transplantation: clinical presentation and treatment outcomes

Background

Late complications of allogeneic hematopoietic stem cell transplantation (HSCT) include a risk of secondary malignancies, including oral cancers. Optimization of best clinical practices for early diagnosis and treatment of oral premalignant or malignant lesions requires an assessment of potential predisposing risk factors as well as treatment outcomes.

Methods

The medical records of patients who developed oral epithelial dysplasia (OED) and oral squamous cell carcinoma (OSCC) following allogeneic HSCT were reviewed. Data on demographics, HSCT course, chronic graft-versus-host disease (cGVHD), smoking and alcohol consumption, oral lesion characteristics, mode of therapy and clinical outcome were recorded; landmark survival was calculated.

Results

Twenty-six patients with OED (n = 8) and OSCC (n = 18) were identified with a median follow-up of 26.5 and 21.5 months, respectively. Premalignant and malignant oral lesions were diagnosed at a median time of 2.5 and 8 years after HSCT, respectively. Chronic GVHD was present in 96% of patients and of these, 96% had oral involvement. Multifocal oral cancer was found in 28% of cases, and localized recurrence was observed in 44% of cases. Five-year overall survival was 75% and 70% for OED and OSCC, respectively.

Conclusions

These results suggest that oral cGVHD may be considered a potential risk factor for the development of OSCC following allogeneic HSCT. The observation that oral cancers were frequently multifocal and recurred locally supports the concept of field cancerization and suggests that these cancers may be more aggressive compared with the non-HSCT population. Vigilant follow-up and coordination of care between hematologists and oral health specialists are critical to minimize morbidity and mortality.

Psychological distress as a negative survival factor for patients with hematologic malignancies who underwent allogeneic hematopoietic stem cell transplantation

STUDY OBJECTIVE

To evaluate the influence of distress on overall survival of patients with hematologic malignancies who underwent allogeneic stem cell transplantation (allo-SCT) and to analyze the possible risk factors for death.

DESIGN

Retrospective cohort study.

SETTING

Large tertiary care teaching hospital.

PATIENTS

Seventy-seven patients (aged ≥ 15 yrs) with hematologic malignancies who underwent allo-SCT between January 2000 and August 2007; 20 patients with distress history were matched in a 1:3 ratio with 57 patients without distress history.

MEASUREMENTS AND MAIN RESULTS

The primary outcome was overall survival, defined as the time from allo-SCT to disease-related death or last date of follow-up. Secondary outcomes were time to hematologic recovery (absolute neutrophil count ≥ 500 cells/mm³) from day of allo-SCT, length of hospital stay, and opioid usage. Sociodemographic information and clinical characteristics were analyzed for possible risk factors. Patient history of psychological distress resulted in a significantly higher mortality rate in the first year after allo-SCT (hazard ratio [HR] 3.05, 95% confidence interval [CI] 1.48-6.28, p=0.001) and led to a shorter overall survival rate (HR 1.63, 95% CI 0.86-3.10, p=0.133). However, psychological distress had no effect on hospital length of stay, hematologic recovery time, opioid usage status, or dose of opioid analgesics used. Factors associated with death after allo-SCT in the univariate analysis (p<0.05) were high-relapse risk disease, umbilical cord blood SCT, total-body irradiation-containing conditioning regimen, and higher educational background. In the multivariate analysis, high relapse risk (HR 3.85, 95% CI 1.81-8.20, p<0.001) and total-body irradiation-containing conditioning regimen (HR 3.50, 95% CI 1.29-9.51, p=0.01) were identified as risk factors for death.

CONCLUSION

A history of psychological distress before allo-SCT, after adjusting for other patient- and disease-related prognostic factors, had a significant influence on early death in the first year after transplantation.

Sexual functioning in patients undergoing bone marrow transplantation: a longitudinal study

Patients undergoing bone marrow transplantation (BMT) reported numerous sexual difficulties pretransplantation and at 1- and 3-years post transplantation. The most commonly reported problems pretransplant were a lack of sexual interest for men and self-perceived unattractiveness for women. At year 1, men reported more concern about physical attractiveness and increased problems with erection, ejaculation and orgasm. Women reported more sexual problems across all categories. At year 3, difficulties for men remained relatively consistent or decreased compared to year 1 with the exception of an increased concern about physical appearance. At year 3, women reported increased sexual interest; concerns about body appearance, vaginal dryness, painful intercourse and orgasm remained higher than at baseline, although all had decreased from year 1. Half of patients at all time points reported no discussion of sexuality with their health care provider. Baseline level of depression was significantly and positively related to sexual functioning at year 3 post transplant. These results suggest that sexual problems are significant for BMT survivors and that treatment of depression and health-care-provider education are possible interventional targets for improving sexual function and quality of life following BMT.

Dialogue among survivors of hematopoietic cell transplantation support-group themes

Many survivors of hematopoietic cell transplantation (HCT) are challenged by physical, psychological, and social complications throughout the months and years post-transplant, as uncovered by many researchers during the past few years. The literature on the use of support groups for improving quality of life has mostly included studies of participants with solid tumor cancers. There is a paucity of literature describing the use of support groups with HCT survivors. The purpose of the present study is to describe the various issues that are discussed by participants in a monthly post-HCT support group. These issues have been described and grouped into themes by the authors. The results can provide a foundation about long-term effects of HCT that future research can investigate more closely, followed by research that can study interventions to assist in improving quality of life of HCT survivors. Recommendations for applying findings to current clinical practice using support groups are identified.

The lived experience post-autologous haematopoietic stem cell transplant (HSCT): a phenomenological study

Autologous haematopoietic stem cell transplant (HSCT) has a high physical and emotional morbidity. This study using Husserlian phenomenological methodology and using Giorgi's (Phenomenology and Psychological Research, Dusquesne University Press, Pittsburgh, 1985) method of analysis was undertaken to attempt to gain some understanding of the patient's experience. Five adult patients who had previously undergone autologous transplantation for a haematological malignancy at least 6 months before participated in the study. Interviews with the participants were audio taped and then transcribed verbatim. Nine themes emerged from the participants' stories and included psychological cost, physical and psychological adaptation, reprioritisation and a sense of isolation. The transplant experience can be separated into a discrete period of time and the findings illustrate that the experience of transplantation impacts on the life of the person for an undetermined period of time. The changes experienced may be permanent and the post-transplant person, emotionally, psychologically and physically, is not the same person who entered into transplant. For nurses and other health care professionals to improve practice it is imperative that they understand the lived experience their patients have undergone. Pretransplant preparation and post-transplant rehabilitation can be enhanced by having a greater depth of understanding.

Quality of life in adult hematopoietic cell transplant patients at least 5 yr after treatment: a comparison with healthy controls

BACKGROUND AND OBJECTIVE

As long-term survivors of hematopoietic cell transplantation (HCT) become more numerous, studies addressing the issue of long-term follow-up are necessary. In this study, we report on the quality of life (QOL) of HCT-patients, who were alive at least at 5 yr after transplantation in comparison to an age- and sex-matched sample of healthy controls assessed in the same time-period and the same geographical region.

DESIGN AND METHODS

The European Group of Research and Treatment of Cancer (EORTC)-QOL Questionnaire (EORTC-QLQ C30) was sent by post to 39 HCT-survivors. Thirty-four patients answered the questionnaire. Patients were compared with 68 healthy controls from the same geographical region. Patients and controls completed the EORTC in the same time period.

RESULTS

Mann-Whitney U-tests identified significantly lower QOL on the dimensions of physical and social functioning and on the financial impact symptom scale.

CONCLUSIONS

Patients who had survived their HCT for more than 5 yr did generally well in terms of global QOL. This is consistent with Kiss et al. (J Clin Oncol 2002;20:2334-2343), who found that chronic myeloid leukemia patients who were alive at least 10 yr after HCT report lower physical functioning in comparison to healthy controls. Problems in the areas of social functioning and financial difficulty can possibly be addressed by intensive rehabilitation processes integrating patients, family members and significant others. Interdisciplinary (medical, psychological and social) treatment of patients should not come to an end after the acute phase of the illness but should continue during check-ups following transplantation.

Oral malignancies following HSCT: graft versus host disease and other risk factors

Allogenic hematopoietic stem cell transplantation (HSCT), a procedure that is widely used in the treatment of a large number of malignant and non-malignant hematological diseases, is still associated with a wide range of complications, one of the most important of which is graft versus host disease (GVHD). The patients undergoing allogenic HSCT are also at high risk of developing secondary neoplasms, particularly leukemias and lymphomas. Solid tumors are less frequent, and the incidence appears to increase over time; the most frequent solid tumors are squamous cell carcinomas. We found that almost all studies of solid cancers occurring after transplantation are based on relatively small numbers of cases which have been monitored for short periods, and little information is available on individual cancers. In particular, reports of oral cancers in HSCT are very few. Potential risk factors associated with the development of secondary solid cancers after HSCT have been well described. They include graft versus host disease (GVHD), preoperative regimens, with either radio-chemotherapy or chemotherapy alone, conditioning regimes, immunosuppressive GVHD prophylaxis, viral infection and chronic stimulation as a result of viral antigens, antigenic stimulation from histocompatibility differences between recipient and donor, primary diagnosis, interaction of any of these factors with genetic predisposition, and other factors such as sex and age. All patients treated with HSCT should therefore be closely followed over the long term with the aim of identifying the onset of secondary tumors as early as possible.

Pathways for psychosocial care of cancer survivors

Today, the growing number of survivors from many sites of cancer necessitates that thought be given to ways that ensure follow-up psychosocial care and its integration into ongoing medical surveillance. The establishment of standards of care together with evidence- and consensus-based clinical practice guidelines have provided a highly effective method of enhancing quality care for treatment of cancer. There remain, however, major problems in dissemination and application of these guidelines on the clinical level. The National Comprehensive Cancer Network (NCCN) formed a Panel on Distress Management that developed the first set of consensus-based standards for psychosocial care and clinical practice guidelines specific to cancer illnesses. This article proposes the extension of their concepts to cancer survivors. A model is presented that can assist oncologists and multidisciplinary teams in busy ambulatory settings to more readily identify those survivors who are distressed, whose quality of life is impaired, and who may benefit from further psychological evaluation and treatment. Three groups of cancer survivors are identified for whom pathways for psychosocial care should be defined and developed: 1) survivors with physical sequelae, often resulting in significant neuropsychologic and physical consequences; 2) survivors with psychological sequelae or psychiatric disorders that interfere with functioning and quality of life; and 3) survivors with subsyndromal symptoms who have no identified physical or psychiatric sequelae, but who may nonetheless need help integrating the cancer experience into their lives to increase a sense of purpose, direction, and well being. A rapid screening tool for distress could be used at the time of follow-up visits to oncologists or physicians to identify patients with psychological, social, or spiritual concerns and could serve as a pathway for evaluation and referral for psychosocial counseling. Treating distress in these areas is to be viewed as an integral part of surveillance for survivors, and pathways to ensure integration are important.

Sexual functions after high-dose chemotherapy in survivors of germ cell tumors

We investigated the changes in sexual function in male patients with germ cell tumor continuously disease free after one or two courses of high-dose chemotherapy with hematopoietic stem cell support. A questionnaire was mailed to 35 patients, and 30 patients sent it back. Sexuality was considered a problem by 10 patients (33%), but no patients considered sexuality a major problem. Erection was more difficult to achieve in seven patients (23%) and 10 patients (33%) experienced increased difficulty in maintaining an erection. Eight patients (27%) had the experience of less intensive and less frequent orgasm. In all, 13 patients (43%) thought that both the disease and treatment had worsened their sexual capacity, but 20 patients (67%) were satisfied with their sex life. Most of the patients (63%) considered that insufficient information and counselling had been given by their physicians about the sexual sequelae of therapy. However, the amount of information about the disease and treatment was considered good by 77 and 80% of the patients, respectively. This study shows that 27% of patients were not content with their ability to attain sexual satisfaction due to the illness or its treatment. Communication is an important issue and better information tools could lead to improved compliance in these patients.

Oral graft-versus-host disease and programmed cell death: pathogenetic and clinical correlates

Graft-versus-host disease (GVHD) is an untoward complication of bone marrow transplantation. It is characterized by an immune-mediated attack by donor immune cells against various host cells and tissues, a process which may be associated with significant morbidity in affected patients. Oral lesions are a common sequelae and can serve as a highly predictive index to the presence of systemic GVHD. The oral lesions of GVHD are clinically and histologically lichenoid in nature and can be a challenge in terms of management. Ulcerated and painful mucosal lesions may represent a significant impediment to normal eating habits and nutritional intake, necessitating appropriate diagnosis and treatment. Importantly, recent evidence has indicated that programmed cell death, or apoptosis, is the major constituent in the pathogenesis of GVHD. Apoptosis not only plays a major role in normal growth and ontogeny, but has been shown to contribute to a wide spectrum of both inflammatory and neoplastic disorders. Since knowledge of apoptotic molecular pathways is requisite for understanding GVHD, the purpose of this paper is to provide a fundamental overview of the predominant apoptotic mechanisms implicated in the pathogenesis of GVHD and to relate these findings to the oral complications of the disease. Finally, we will discuss management strategies for diagnosing and treating the oral lesions of GVHD. By explicating the molecular events in the apoptotic pathway, unique therapeutic and pharmacologic strategies for regulating apoptosis may be developed in the future, reducing the morbidity associated with conditions like GVHD.

The CARES-SF used for prospective assessment of health-related quality of life after stem cell transplantation

OBJECTIVE

By employing the Cancer Rehabilitation and Evaluation System short form (CARES-SF) prospectively we wanted to focus on the rehabilitation needs after high-dose chemotherapy (HDC) and stem cell transplantation, in order to identify problems that should be addressed by health-care professionals during the course of disease and treatment.

METHODS

The CARES-SF was administered before and at 2, 6 and 12 months post-transplant to 130 cancer patients treated with HDC and allogeneic (SCT) or autologous stem cell transplantation (ASCT). Physical function scale scores were compared with the corresponding scale of the EORTC QLQ-C30.

RESULTS

The SCT group reported significantly better physical function than the ASCT group before transplant on both the CARES-SF (p<0.0001) and the EORTC QLQ-C30 (p<0.01). Almost identical mean CARES-SF scores across groups (SCT: 0.7-1.4, ASCT: 0.8-1.3) were found at the subsequent assessments, consistent with the QLQ-C30 data. Correlations between CARES-SF and QLQ-C30 Physical Function Scales ranged from 0.45 to 0.65. The SCT group had better psychosocial subscale scores (mean 0.4 and 0.5 versus ASCT: 0.7 and 0.8, p < 0.01) at the 6 and 12-month assessments, as well as better satisfaction on the marital subscale ( p=0.01) 6 months post-transplant. Few patients requested specific help: 19% at baseline with 'fear of the cancer progressing' and 9% with 'reduction in physical energy' after 6 and 12 months.

CONCLUSION

The CARES-SF detected differences across groups of patients as well as within-patient changes over time. The possibility for patients to express their need for professional assistance renders the CARES-SF appropriate after SCT/ASCT. The sexual, marital and medical interaction subscales in particular address specific issues of relevance for follow-up care, compared with more traditional questionnaires assessing health related quality of life (HRQOL).

Caregiver and patient marital satisfaction and affect following hematopoietic stem cell transplantation: a prospective, longitudinal investigation

The process of stem cell transplantation (SCT) is both intra and inter dependent; like patients, spousal caregivers (CGs) are affected by the experience. Few empirical investigations have focused on the needs of CGs or dyadic differences over the course of adaptation-the foci of the present study. SCT recipients and spousal CGs (n=131 dyads) completed the Profile of Mood States (POMS) and the Dyadic Adjustment Scale at three time points: pre-transplant, 6 months post-transplant and 1 year post-transplant. A separate, non-medical group completed the POMS as a normative sample. CGs reported higher levels of depression and anxiety as compared to patients and non-medical norms. With respect to marital satisfaction, couples were matched in their perceptions of the relationship prior to transplantation but grew mismatched over time. Six months and 1 year post-transplant, CGs reported lower levels of marital satisfaction relative to their patient counterparts. Counter to prediction, change in CG marital satisfaction (from pre-transplant to 1 year post-transplant) was predicted only by CG gender, not patient physical, nor psychosocial characteristics. Findings offer implications for person-specific and relationship-protective interventions.

Association of depressive syndrome and early deaths among patients after stem-cell transplantation for malignant diseases

PURPOSE

The association of depression and increased mortality in the general population, and also various medical conditions, is well documented. However, depression is not well studied in the setting of hematopoietic stem-cell transplantation (HSCT). We examined the association between depressive syndrome and survival after HSCT.

PATIENTS AND METHODS

A total of 193 patients who received autologous or allogeneic HSCT from Brigham and Women's Hospital or Dana-Farber Cancer Institute were evaluated prospectively. The self-rated Likert-scaled symptom checklist, the SF-36, and the Spitzer Quality of Life Index Scale were administered. Outcomes evaluated included survival and quality of life.

RESULTS

Sixty-seven patients (35%) satisfied the criteria for depressive syndrome. The 1-year probability of survival for the depressed and nondepressed patients was 85% (95% confidence interval [CI], 74% to 92%) and 94% (95% CI, 89% to 97%), respectively (P =.04). In multivariable modeling, depressed patients have a three-fold greater risk of dying than nondepressed patients (95% CI, 1.07 to 8.30; P =.04) between 6 and 12 months after HSCT after adjusting for other prognostic factors. Global inferiority in quality of life was observed in the depressed cohort when last measured at 24 months after transplantation.

CONCLUSION

Depressive syndrome after HSCT is associated with decreased survival, at least from 6 to 12 months after transplantation. Persistence of this association after controlling for possible confounding factors suggests that depression may be more than simply a marker for concurrent ill health. This study raises an interesting hypothesis as to whether psychological or pharmacologic intervention for depression after HSCT can improve survival and/or quality of life.

Stem cell transplantation for Hodgkin's disease: a review of the literature

High-dose chemotherapy followed by autologous peripheral-blood stem cell transplantation has resulted in long-term disease-free survival of 30%-60% in selected patients with refractory and relapsed Hodgkin's disease. In addition, a significant reduction in early transplant-related mortality in more recent studies has led to the widespread acceptance of autografting. Comparatively few studies of allografting for Hodgkin's disease have been performed. Although no prospective randomized trials have been performed, historical results show a significantly lower relapse rate when allografting results are compared to autografting results. These results suggest that a graft-versus-Hodgkin's disease effect may exist. Unfortunately, the lower relapse rate following allografting is offset by higher transplant-related mortality. The use of low-intensity nonmyeloablative regimens for allografting may harness a graft-versus-Hodgkin's disease effect with less morbidity and mortality than that observed following conventional allografting.

A predictive model of varicella-zoster virus infection after autologous peripheral blood progenitor cell transplantation

Varicella-zoster virus (VZV) frequently causes severe infections in patients who have undergone bone marrow transplantation. The frequency of, characteristics of, and risk factors for this infection were studied in 164 patients undergoing autologous peripheral blood progenitor cell transplantation (PBPCT). Twenty-six patients (15.8%) developed VZV infection, and the actuarial risk was 10% at 1 year. No patient had visceral dissemination or died because of VZV, although one-third of the patients developed postherpetic neuralgia. By multivariate analysis, a CD4(+) lymphocyte count of <200 cells/microL (P<.0001; odds ratio [OR], 2.0) and a CD8(+) lymphocyte count of <800 cells/microL (P=.0073; OR, 2.0) at day 30 after transplantation were factors associated with VZV infection. Patients with both these adverse factors had an actuarial risk of VZV of 48% at 1 year. Patients with deficiency in both CD4(+) and CD8(+) lymphocytes are at high risk of VZV infection. These patients should be considered as candidates for preventive therapy, but whether for antiviral therapy or vaccination remains to be investigated.

Longitudinal effects of high-dose chemotherapy and autologous stem cell transplantation on quality of life in the treatment of metastatic breast cancer

This study determined the effects of high-dose chemotherapy (HDCT) with autologous blood stem cell transplantation (ASCT) on quality of life (QL) in women with metastatic breast cancer prior to, and during treatment, and up to 1-year post-ASCT. Thirty-three women diagnosed with metastatic breast cancer participated in a phase 1 clinical trial of a new combination of cyclophosphamide (CTX) and mitoxantrone (MXT), with dose escalation of paclitaxel. Longitudinal QL data were collected using the functional living index-cancer (FLIC) and symptom scales at seven time periods: pre-induction chemotherapy (CT), post-induction CT, post-high dose CT (HDCT), and at 3, 6, 9 and 12 months post-ASCT. FLIC scores indicated that the worst problems for patients were feelings of hardship on themselves and their families, followed by psychological functioning and physical functioning problems. The time around diagnosis of the metastatic disease and following HDCT were the worst times for all levels of quality of life, but anxiety and depression symptoms continued to increase in severity across the entire follow-up period. The symptoms that were most problematic were worry about the future, loss of sexual interest, anxiety about the treatment, general worrying, and joint pain. These data highlight the problems that women with metastatic breast cancer encounter at different stages of the disease and treatment process, and can be used to tailor psychosocial interventions appropriate for treating the relevant issues at different points in time.

High level of fatigue in lymphoma patients treated with high dose therapy

With the success of high dose therapy supported by autologous bone marrow transplantation (ABMT) for malignant lymphomas, medical late-effects and secondary effects on subjective health, like fatigue, are of concern. Fatigue is poorly understood and correlates have been barely addressed. Health-related quality of life (HRQL), fatigue, and correlates to fatigue, including endocrinological status and serum levels of interleukin-6, tumor necrosis factor, and soluble tumor necrosis factor receptors, were investigated in a cross-sectional study of 33 lymphoma patients (median age 39 years) 4-10 years after ABMT. The survivors were compared to general population norms. Fatigue was highly prevalent, and females reported significantly more fatigue and impaired HRQL compared to males and the normal population. Gonadal dysfunction was found in the majority of the patients, but no statistically significant endocrinological or immunological associations with fatigue could be demonstrated. The high level of fatigue among female long-term survivors after ABMT may be related to the gonadal dysfunction, but further studies of possible mechanisms behind fatigue are necessary.

Quality of life in patients surviving at least 12 months following high dose chemotherapy with autologous bone marrow support

BACKGROUND

Over the past decade, high dose chemotherapy with autologous bone marrow (HDC-ABMT) support has been used increasingly in the treatment of patients with breast cancer. In evaluating the results of HDC-ABMT in patients with breast cancer, an assessment of quality of life can add to the traditional endpoints (toxicity, and disease-free and overall survival) that are routinely assessed in clinical trials.

PURPOSE

This study evaluated the quality of life (QOL) of breast cancer patients who had survived 1 or more years following high dose chemotherapy with autologous bone marrow transplant (HDC-ABMT) support.

METHODS

Eighty-two patients who had undergone HDC-ABMT were surveyed by written questionnaire and follow-up telephone interview at least 1 year following HDC-ABMT. Patients were asked to complete the Functional Living Index-Cancer (FLIC), the Symptom Distress Scale (SDS), and a survey of sexual function developed as part of the study.

RESULTS

The mean FLIC score among all patients was 130 +/- 19.1 (possible range 22-154). FLIC scores were significantly lower in patients with evidence of recurrent disease than in patients who were free of disease. The most commonly reported symptoms after HDC-ABMT were insomnia, fatigue, and pain. Sexual interest and sexual activity were reported to be lower after participation in HDC-ABMT than prior to the procedure. The majority of patients who were employed outside the home prior to HDC-ABMT returned to work with a median time away from work of 48 weeks.

CONCLUSIONS

Patients with breast cancer who survive 1 or more years following HDC-ABMT rate their QOL at a relatively high level and frequently return to work. Less than one-third of patients who were interviewed reported moderate to severe symptoms. Problems with sexual functioning were common.

IMPLICATIONS

Future research is needed on long-term outcomes after HDC-ABMT and on specific areas of concern, such as sexual functioning.

Long-term toxicity of the treatment of Hodgkin's disease

At the present time, the majority of patients who develop Hodgkin's disease can be cured with radiotherapy and/or chemotherapy. A long follow up of cured patients has shown that the cumulative toxicity from treatment related complication rivals the mortality from Hodgkin's disease. In addition to late fatal complications, delayed adverse effects of therapy on the thyroid, reproductive system, and bones are burdens many patients have to bear. Future treatment regimens for Hodgkin's disease will be designed attempting to minimize these complications. Follow up of those patients now in remission should focus on the prevention of morbidity and mortality by anticipating and preventing late complications.

Infections following peripheral blood progenitor cell transplantation for lymphoproliferative malignancies: etiology and potential risk factors

PURPOSE

We sought to describe the infections that occur after large-dose chemotherapy, which was followed by autologous peripheral blood progenitor cell transplantation, and to determine their risk factors.

PATIENTS AND METHODS

We retrospectively analyzed the occurrence and the characteristics of infections in 277 consecutive patients who received intensive chemotherapy for non-Hodgkin's lymphoma (n = 207), Hodgkin's disease (n = 27), or multiple myeloma (n = 43) in a single institution. Conditioning regimens included total body irradiation in 47% of the cases. Infections occurring within the 30 days after transplant were defined as early infections, whereas infections after that time in patients who had achieved a neutrophil count greater than 1.0 x 10(9)/L (1,000 per microL) were considered as late infections.

RESULTS

Within the first 30 days, 172 patients had unexplained fever (62%); infections were documented in 83 patients (30%), most commonly bacteremia (57 patients). Late infections occurred in 64 (26%) of 244 evaluable patients and consisted mainly of varicella zoster virus infections (n = 36) and pneumonia (n = 16). Administration of total body irradiation [odds ratio (OR) = 2.50; 95% confidence interval (CI) 1.4 to 4.5; P = 0.002) and previous use of fludarabine (OR 2.5; CI 1.2 to 5.2; P = 0.02) and a diagnosis of myeloma (OR 2.6; CI 1.2 to 5.6; P = 0.04) were significantly associated with late infections.

CONCLUSIONS

This study confirms that infectious toxicity after peripheral blood progenitor cell transplantation is usually moderate, although bacteremia remains a serious problem. Late infections are encountered in about 25% of patients and are more common in those with myeloma, or those who received total body irradiation or fludarabine.

Health-related quality of life 1 year after allogeneic or autologous stem-cell transplantation: a prospective study

PURPOSE

To evaluate health-related quality of life (HRQOL) in adults treated with high-dose chemotherapy followed by allogeneic (SCT) and autologous (ASCT) stem-cell transplantation 1 year after transplantation, using data from concurrent lymphoma patients receiving combination chemotherapy (CT) as a reference.

MATERIALS AND METHODS

Forty-one leukemia patients (SCT group), 51 lymphoma patients (ASCT group), and 85 CT patients completed the European Organization for Research and Treatment of Cancer QLQ-C30 questionnaire at baseline and after 1 year.

RESULTS

The SCT group (median age, 36 years) had better functioning scores and less symptomatology at baseline compared with the ASCT (median age, 41 years) and CT (median age, 37 years) groups. Statistically significant differences of 10 or more points on the 0 to 100 scales were found for 10 of 15 scales and items (P< or =.01) between the SCT and ASCT groups. Global quality of life (79 v 58, P<.0001), role function (83 v 65, P = .001), sleep disturbances (6 v 28, P<.0001), and fatigue (25 v 44, P = .0001) deviated most. The differences were 10 or more points for seven of 15 scales and items comparing the SCT and CT groups, with sleep disturbances (6 v 35, P<.0001) and pain (11 v 29, P<.01) deviating most. Differences across groups were smaller after 1 year; cognitive function was the only scale with a statistically significant difference (ASCT 80 v CT 89; P = .002). Patterns of change in HRQOL scores were different between groups during follow-up. A great improvement was found in the ASCT group (P<.01 for emotional and role function, fatigue, appetite, and constipation), whereas no significant changes were observed for the SCT group.

CONCLUSION

Prospective studies with extended follow-up periods are necessary to separate a slow recovery process from more permanently reduced HRQOL after transplantation and to examine the late side effects from previous treatment.

Early infections after autologous transplantation for haematological malignancies

The purpose of this study was to evaluate the early infectious complications following autologous transplantation in haematological patients. Sixty-one patients who underwent either autologous bone marrow (BM; 28 patients) or peripheral blood stem cell (PBSC; 33 patients) transplantation for haematological malignancies were reviewed retrospectively. Engraftment happened significantly faster and the length of hospital stay was shorter in the PBSC group compared with the BM group. All patients in the study developed fever and all but two experienced temperatures > or = 38.5 degrees C. Overall, 57 patients had signs of oral mucositis, 23 with ulceration. Twenty patients had bacteraemia, 12 developed pneumonia, 6 systemic fungal infection. No major differences were found between the two groups in distribution or incidence of infections. This study indicates that the use of peripheral blood stem cells results in faster engraftment and shorter hospital stay, whereas the effect on the incidence of early infections seems to be unaffected.

Psychological support to an autologous bone marrow transplant unit in a community hospital: a pilot experience

Autologous Bone Marrow Transplantation (AuBMT) has emerged as an efficacious treatment for certain hematological and solid tumors. Some of the complications of allogeneic transplants are avoided with an autologous transplant. Due to the decreased toxicity of this procedure, AuBMT can be administered at a community hospital where the setting is less burdensome for patients and families. The latter can continue to provide support for the patient as relocation is not necessary and visiting is easier. This report is a case analysis of the first 30 patients to undergo an autologous transplant as a pilot study in such an environment. This pilot project--done in a community hospital in Connecticut--may provide cost effective, high quality care in a more personal environment in the patient's own community. The different neoplastic diagnoses are listed as well as the types of psychological interventions available for these patients. Two case studies are described for clinical illustration. A discussion presents how psycho-oncology can assist the multidisciplinary team.

Autologous bone marrow transplantation in advanced Hodgkin's disease

Autologous bone marrow transplantation (ABMT) has been proposed as an alternative treatment of resistant/refractory Hodgkin's disease (HD). Thirty-seven patients in various phases of HD underwent autografting in our Center: fourteen received a CBV conditioning regimen, the others BCNU or VP16 followed by cyclophosphamide and TBI. Three patients died before engraftment, 28 (75.67%) achieved CR and 6 showed persistent disease. As of March 1996, 18 patients had died and 13 were in continuous CR. The median event-free survival (EFS) and 3-year EFS chances were respectively 9 months and 31.3% in the series as a whole, 14 months and 40% in primary resistant disease, 9 months and 28.4% in responsive relapse, and 3 months and 22.2% in resistant relapse. As many of these patients had failed to respond to third-line therapies, their EFS figures are primarily attributable to the therapeutic efficacy of ABMT. Furthermore, since the EFS curves are better in patients seemingly characterized by a lower chance of chemoresistance, our data favour the use of ABMT in the earlier phases of HD.

Solid cancers after bone marrow transplantation

BACKGROUND

The late effects of bone marrow transplantation, including cancer, need to be determined in a large population at risk.

METHODS

We studied 19,229 patients who received allogeneic transplants (97.2 percent) or syngeneic transplants (2.8 percent) between 1964 and 1992 at 235 centers to evaluate the risk of the development of a new solid cancer. Risk factors relating to the patient, the transplant, and the course after transplantation were evaluated.

RESULTS

The transplant recipients were at significantly higher risk of new solid cancers than the general population (observed cases, 80; ratio of observed to expected cases, 2.7; P<0.001). The risk was 8.3 times higher than expected among those who survived 10 or more years after transplantation. The cumulative incidence rate was 2.2 percent (95 percent confidence interval, 1.5 to 3.0 percent) at 10 years and 6.7 percent (95 percent confidence interval, 3.7 to 9.6 percent) at 15 years. The risk was significantly elevated (P<0.05) for malignant melanoma (ratio of observed to expected cases, 5.0) and cancers of the buccal cavity (11.1), liver (7.5), brain or other parts of the central nervous system (7.6), thyroid (6.6), bone (13.4), and connective tissue (8.0). The risk was higher for recipients who were younger at the time of transplantation than for those who were older (P for trend <0.001). In multivariate analyses, higher doses of total-body irradiation were associated with a higher risk of solid cancers. Chronic graft-versus-host disease and male sex were strongly linked with an excess risk of squamous-cell cancers of the buccal cavity and skin.

CONCLUSIONS

Patients undergoing bone marrow transplantation have an increased risk of new solid cancers later in life. The trend toward an increased risk over time after transplantation and the greater risk among younger patients indicate the need for life-long surveillance.

Stem cells from bone marrow, umbilical cord blood and peripheral blood for clinical application: current status and future application

Bone marrow transplantation (BMT) has progressed rapidly during the past two decades to that of a treatment of choice as a therapeutically effective modality for the treatment of selected patients with malignant disease and non-malignant hematological disorders. However, its use is limited by availability of human leukocyte antigens (HLA)-matched donor cells, engraftment and graft-versus-host disease (GVHD). Prevention of GVHD, improvement in the speed and quality of marrow reconstitution, and screening of new immunomodulating agents which improve engraftment and augment hemopoiesis are intense areas of investigation. To this end there has clearly been progress in purification and characterization of human stem cells from different tissue sources. Discussed in this review are: (a) stem cell purification, characterization and ex vivo expansion; (b) bone marrow stem cell transplantation; (c) cord blood stem cell transplantation; (d) peripheral blood stem cell transplantation; (e) fetal liver stem cell transplantation; (f) in utero stem cell transplantation; and (g) evaluation of the capacity of stem cells to serve as targets for gene therapy.

Quality of life following bone marrow transplantation: findings from a multicentre study

Questionnaires assessing a range of quality of life (QOL) outcomes were completed by 200 adult bone marrow transplant (BMT) recipients from five BMT treatment centres. Respondents had undergone allogeneic (46%) or autologous BMT (54%) for a haematological malignancy and were disease free and at least 12 months post BMT (mean 43 months). Variability in post-BMT QOL was reported with deficits in physical, sexual and occupational functioning particularly likely. Allogeneic recipients reported poorer QOL than autologous recipients. Greater age at BMT, lower level of education and more advanced disease at BMT were consistent risk factors for poorer QOL. Contrary to previous research, evidence for improved functional status with the passage of time post BMT was obtained. Factors generally not associated with post-BMT QOL included disease diagnosis, dose of total body irradiation, presence of chronic graft-versus-host disease (GVHD), type of GVHD prophylaxis and extent of marrow graft match. In conclusion, while many BMT recipients reported normal QOL, the majority indicated that their QOL was compromised relative to premorbid status. Prospective, longitudinal research will be necessary to further identify risk factors for poor post-BMT QOL and identify the temporal trajectory of post-BMT QOL.

Quality of life in adult cancer patients treated with bone marrow transplantation--a review of the literature

There is now an increasing interest in measuring quality of life (QOL) in cancer patients. Information on psychosocial issues and the patients' QOL give a more comprehensive evaluation of the treatment outcome than survival and relapse free intervals alone. Bone marrow transplantation (BMT) has become a standard, curative treatment in haematological diseases such as leukaemia and lymphomas. However, serious physical and psychological side effects are experienced by some patients. A review of the literature on QOL in adult BMT patients shows that the development in post-BMT research on psychosocial factors is slowly progressing. Most studies are retrospective with small sample sizes, and only five of 48 studies fulfilled our preset quality criteria. Identification of factors that are predictive for poor post-BMT outcome might provide a basis for targeted support programmes. This underlines the necessity of undertaking prospective studies using reliable and well-validated methods for measuring QOL in this patient group.

Single high-dose etoposide and melphalan with non-cryopreserved autologous marrow rescue as primary therapy for relapsed, refractory and poor-prognosis Hodgkin's disease

A simplified schedule of high-dose chemotherapy (HDC) consisting of melphalan (140 mg m-2) plus VP16 (2.5 g m-2) given over 12-18 h together with autologous non-cryopreserved autologous bone marrow transplant (ABMT) was used for treatment of relapsed (37 patients) and refractory (seven patients) patients and as first-line treatment (four patients) for poor-prognosis Hodgkin's disease. Two patients had a second HDC-ABMT after relapse following prior HDC-ABMT, giving a total of 50 procedures among 48 patients. The haematological recovery rate was 98% with a complete response rate of the Hodgkin's disease of > 90%. Factors significantly influencing response rate were performance status and the presence of liver involvement. Thirty-nine patients are alive, with 37 in continuous complete remission. The median duration of survival and median duration of remission have not been reached at a median follow-up time of 45 months. Adverse prognostic factors for survival were disease status at the time of HDC-ABMT (refractory versus relapse, with primarily refractory patients showing significantly poor survival) and the presence of liver involvement. High-dose chemotherapy with short-duration chemotherapy and non-cryopreserved bone marrow is an effective and safe treatment modality for patients with relapsed and poor-prognosis Hodgkin's disease.

Psychiatric and psychosocial aspects of bone marrow transplantation

Bone marrow transplantation (BMT) is being increasingly used to treat children and adults with a variety of life-threatening diseases. Although BMT is a life-saving intervention in many instances, it is a high-technology procedure--both aggressive and life-threatening--associated with an array of physical and psychological stressors. Therefore, psychiatric and psychosocial research and intervention can greatly contribute to the understanding and management of BMT recipients, donors, and their families. Seven major areas of psychiatric and psychosocial concern in BMT are identified and the literature relevant to each area is reviewed.