Long-Term Follow-up After Allogeneic Stem Cell Transplantation
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Background: Over 3000 persons undergo allogeneic hematopoietic stem-cell transplantation (allo-HSCT) in Germany every year. Advances in allo-HSCT have prolonged the survival of treated patients but have concomitantly increased the risk of long-term complications that impair their quality of life.
Methods: This literature review of the long-term sequelae of allo-HSCT is based on pertinent articles that were retrieved by a selective search of PubMed, and on current international guidelines. Case reports were excluded from consideration.
Results: Hardly any randomized clinical trials have been performed to investigate the long-term outcome of allo-HSCT, but international consensus-based guidelines have been published. 50% to 70% of patients treated with allo-HSCT develop chronic graft-versus-host disease (cGVHD) within ten years of treatment. Transplant recipients are at higher risk of infection, including the reactivation of dormant herpes viruses; therefore, vaccination is recommended, as described in the current guidelines. Gonadal dysfunction arises in up to 92% of men and up to 99% of women; its frequency depends on the timing of transplantation, on radiotherapy, and on other factors. The medications that transplant recipients need to take can impair liver function, and transfusion-associated hemosiderosis can do so as well. 40% to 50% of patients suffer from lipid metabolic disturbances that increase the risk of myocardial infarction, peripheral arterial occlusive disease, and stroke. Their life expectancy is shorter than that of the overall population.
Conclusion: Measures should be taken to prevent the potential long-term complications of allo-HSCT. All patients who have been treated with allo-HSCT should receive individualized, risk-adapted, and multidisciplinary follow-up care, so that any complications that arise can be correctly diagnosed and appropriately treated. Long-term follow-up care could be improved by prospective clinical trials investigating the long-term sequelae of allo-HSCT, as well as by consistent, uniform documentation of these sequelae in supra-regional data registries.
Transplantation numbers have been rising steadily in recent years, both in Germany and abroad. First-time allogeneic hematopoietic stem cell transplantations (alloHSCTs) in Germany increased from 1118 in 1998 to 2866 in 2012 (e1). As shown in Figure 1, the most common indication for an alloHSCT is acute leukemia (48.8%) (e1). Total mortality among patients who underwent HSCT in Seattle fell from 63% between 1993 and 1997 to 47% between 2003 and 2007 (hazard ratio [HR] = 0.59, p <0.001). At the same time, non-relapse mortality fell from 41% to 26% (HR = 0.48, p <0.001) (1). In a study by the Center for International Blood and Marrow Transplant Research (CIBMTR), the 10-year survival rate of patients who had survived at least two years after alloHSCT without relapse of their underlying disease was 85% (2). Their life expectancy was lower than that of the general population, however (2).
In another study, 66% of transplant patients but only 39% of their siblings developed at least one chronic health condition; 18% and 8% respectively developed a serious or life-threatening disease (3). The prevalence of chronic health conditions after alloHSCT was 71% (3). Patients suffered cardiovascular diseases more frequently than their siblings (relative risk [RR] = 3.0), and the same was true of deterioration in hearing or vision (RR = 3.7), gastrointestinal complaints (RR = 6.0), and musculoskeletal diseases (RR = 7.1) (3).
Current analyses even report that more than 90% of long-term survivors have at least one chronic health condition (e2, e3). Long-term complications pose an even greater challenge in patients who receive a transplant before the age of 35 years (4).
There is a broad spectrum of long-term complications, ranging from organ-specific complications and infections to secondary malignancies (Table 1). As a result, physicians in all specialties, and primary care physicians, are confronted with unclear symptoms and complications in long-term survivors more frequently than in the past. In order to ensure swift patient care or prompt referral to a transplant center, we would like to make physicians who treat these patients in the first instance aware of the most common complications.
On the basis of a selective search of the PubMed literature of the last 25 years, this article summarizes organ-specific long-term complications and lists the screening examinations that should be performed as part of long-term follow-up of patients after alloHSCT as a result. The search of the literature used the terms “late effect,” “long-term,” “stem cell transplantation,” and “bone marrow transplantation” and combined them with each other. While the list of screening examinations was compiled on the basis of international consensus recommendations (5, 6), only a small number of the recommendations for secondary prevention of long-term complications are evidence-based, as there is a lack of prospective studies. However, they are in line with our experience that complications after transplantation must be diagnosed early and treated promptly. Treating physicians sometimes consult specialists in this process. In addition to the screening examinations recommended in Table 2, patients’ medical history should be taken and organ systems should be clinically examined.
In the long-term follow-up of children and adolescents after alloHSCT it is particularly important to monitor the effects of the underlying disease, earlier chemotherapy and radiotherapy, and transplant-specific complications in the growing body (Figure 2). Organs that have not yet matured seem to be more vulnerable, which can affect future development potential (7). Young age (less than 10 years) at alloHSCT is the most common risk factor for most long-term sequelae, with the exception of hypogonadism.
Providing adequate long-term follow-up care is often problematic, partly because long-term sequelae develop after some time has elapsed and partly because the transition from pediatric to adult medical care can be difficult. Several guidelines have been published to date for pediatric patients (5) (www.survivorshipguidelines.org, www.cclg.org.uk), but only a very small number of prospective studies. It is worth highlighting that a nonmalignant disease with specific comorbidities or risk factors is the indication for an alloHSCT in approximately one-third of all pediatric patients (7).
Chronic graft-versus-host disease
Both chronic graft-versus-host disease (cGVHD), which develops in up to 70% of all patients following alloHSCT, and its treatment can cause complications to be more frequent or more severe. They cause a particularly large increase in infections and also an increase in secondary malignancies. The working group for this review article recently published recommendations for the treatment of cGVHD in Deutsches Ärzteblatt International (8). Because cGVHD and its secondary complications are complex, patients require multidisciplinary treatment in specialized outpatient departments at transplant centers.
Immunodeficiency and infections
In addition to the immunosuppressive medication required to treat cGVHD, the immune system itself is a target of immune responses. This is sometimes associated with long-term T and B lymphocytopenia and functional asplenia. Transplant recipients must therefore be informed in detail of the increased risk of infection, including reactivation of dormant herpes viruses such as cytomegalovirus and zoster virus. Patients must also be made aware that prophylaxis of infection as well as prompt antibiotic treatment of early symptoms of infection and/or fever are required. The possibility of prescribing standby medication can be considered, although this must not replace an immediate visit to a doctor. It is recommended that vaccinations be administered in line with guidelines; this also includes repeat primary immunization (8). Immunoglobulin substitution should be considered if there is evidence of IgG deficiency (<400 mg/dL) or immunoglobulin subclass deficiency, and for recurring infections (8).
Conditioning therapy administered for alloHSCT, including both total body irradiation and long-term corticosteroid therapy for cGVHD, can lead to various endocrine dysfunctions (Table 1). The examinations required for long-term follow-up are listed in Table 2.
Gonadal dysfunction develops in up to 92% of men and up to 99% of women after alloHSCT (6). Complete azoospermia developed in 65% of male patients after alloHSCT. Risk factors were total body irradiation (RR = 7.1), age over 25 years at transplantation (RR = 2.4), and cGVHD in patients with no history of total body irradiation (e4). Hormone replacement therapy can be considered, depending on the patient’s hormonal status and age (9, e5). This is particularly recommended for female patients who were previously premenopausal, in order to prevent complications of early menopause such as osteoporosis and arteriosclerosis. Spontaneous recovery of spermatogenesis or ovarian function has been described only occasionally (10, 11, e5, e6).
The possibility of secondary adrenal insufficiency, which is a particular risk during long-term steroid therapy (10), must be considered in emergency or stress situations.
The causes of liver dysfunction (Table 1) range from drug toxicity side effects via involvement in GVHD to transfusion-associated hemosiderosis or reactivation of earlier viral hepatitis (12). Hemosiderosis is associated with secondary damage to a very wide range of organ systems and increased mortality (13). It occurs in 32% to 58% of transplant recipients (14, 15). Iron overload of the liver can be diagnosed using laboratory testing, MRI, or in rarer cases liver biopsy (14–16). It is treated using phlebotomy and/or iron chelators (17); phlebotomy is more cost-effective and has fewer side effects and should therefore be preferred if blood count is normal.
Hepatitis B virus (HBV) reactivation increases the risk of liver cirrhosis (e7). The risk of hepatic transplantation-associated complications is higher in carriers of chronic hepatitis C (e8): 24% after 20 years (e9).
The incidence of cardiovascular events such as coronary heart disease, peripheral arterial occlusion, and apoplexy 25 years after alloHSCT is 22% (18). The risk 10 years after alloHSCT depends on the number of cardiovascular risk factors present: it lies at 4.7% if there are no risk factors and 11.2% if there are more than two (19). Anthracycline therapy or chest radiation before alloHSCT and pre-existing cardiovascular risk factors increase the risk of cardiovascular diseases (19). Lipid metabolism disorders can be detected in 40% to 50% of patients after alloHSCT. They are associated with accelerated vascular sclerosis. Dyslipidemia after alloHSCT (e10) is caused by both cGVHD and cGVHD treatment in the form of corticosteroids, calcineurin inhibitors (CNIs) such as cyclosporine and tacrolimus, or mTOR inhibitors such as everolimus or sirolimus, and also by history of total body irradiation.
Prophylaxis, diagnosis, and treatment of cardiovascular complications should be performed in line with the recommendations of cardiology societies. Examinations recommended as part of long-term follow-up are listed in Table 2.
Delayed pulmonary effects of alloHSCT are very challenging, as they appear gradually and are difficult to treat. In addition to bronchiolitis obliterans syndrome (BOS) as part of cGVHD, recurring infections may lead to serious long-term complications (20, 21). Early diagnosis followed by swift start of therapy are essential to improving patients’ chances of survival (22). All patients should therefore undergo consistent screening, including lung function testing, from day 100 after alloHSCT onwards, from the age of six years. This should be performed every three months for the first two years and thereafter at least once a year and after lung infections (22). In addition to pharmacological treatment, pulmonary rehabilitation consisting of specific breathing and movement training, dietary counseling, and psychosocial support improves the physical activity of patients with BOS (e11).
The incidence of chronic renal insufficiency after alloHSCT is approximately 30% (23). It is often caused by multiple factors, including intensity of conditioning therapy, use of nephrotoxic drugs, infections, and radiation of the renal area. Recommended screening examinations (24) are listed in Table 2.
Neurological problems are observed in 31% to 42% of transplant recipients (25–27). Damage to the peripheral nervous system, e.g. after a complicated transplant course or CNI therapy (25), manifests as polyneuropathy. Complications affecting the central nervous system are often caused by multiple factors (infections, hemorrhages, leukoencephalopathy, local relapse of underlying disease, central nervous system involvement in GVHD) (28) and are frequently fatal.
In the event of neurological symptoms, neurological assessment by a specialist should be performed, including imaging diagnostics and possibly lumbar puncture.
Reduction in bone density develops early (29–33). It is correlated with use of CNIs and corticosteroids and with loss of muscle mass (32); it affects 24% to 50% of patients (e12). Physiotherapy and stamina training (34) improve muscle strength, performance, and stamina. Calcium and vitamin D as prophylaxis for osteoporosis (35, 36), together with measurement of bone density using dual-energy X-ray absorptiometry (DXA), are recommended for all patients during the first year and in the event of abnormal findings or continued immunosuppressant therapy (35, e12). This must take account of the age-adapted Z-score. Bisphosphonates should be considered as prophylaxis for high-risk patients and as treatment for osteoporosis (35). Hormonal status and dietary counseling are part of multidisciplinary treatment.
The five-year incidence of avascular osteonecrosis, e.g. of the femoral head, is between 4% and 7% (e12, e13). Risk factors are GVHD and/or corticosteroid therapy, underlying disease, age, and male sex (e13, e14).
Psychosocial issues, quality of life
Transplant recipients frequently suffer from insomnia or fatigue (e15). Some also experience cognitive dysfunction or symptoms of an anxiety disorder. Listlessness is reported by 36% of patients after alloHSCT (e16), and depression is described in 9% to 20% of long-term survivors (e17). Suicide and accident rates are higher than in the general population (37). Sexual dysfunction such as erectile or ejaculatory disorders in men, vaginal dryness or dyspareunia in women, and reduced libido in both sexes contribute to a reduced quality of life and should therefore be the subject of targeted enquiry.
Screening for psychosocial burdens such as depression or an anxiety disorder should be provided to all transplant recipients (5). Psychomotor development must be monitored in children and adolescents. Sight and hearing tests and developmental diagnostic testing are recommended in the event of abnormalities or difficulties at school.
The risk of secondary neoplasia increases steadily with time since transplant and is between 1.4 and 2.1 times higher than in the general population (38, 39). The 20-year cumulative incidence of secondary malignancy after alloHSCT is 8.8% (3). The risk is particularly high for secondary neoplasia of the oral cavity, skin, liver, CNS, hematopoietic system, and thyroid. Risk factors are cGVHD (3), age, and history of total body irradiation.
Because early diagnosis of secondary neoplasia contributes to improved overall survival, regular, lifelong follow-up is recommended (39). In addition to medical history and thorough physical examination, skin cancer screening should be performed in line with universally valid screening guidelines. The oral cavity should also be examined, particularly for patients with cGVHD.
It is recommended that women undergo mammograms every one to two years from the age of 40 years onwards (6). Younger female patients who have undergone radiation of the thorax of at least 20 Gy should be screened from the age of 25 years onwards or from eight years after their radiotherapy onwards, whichever comes first (e18). Due to the risk of cervical cancer sexually active female patients and women from the age of 21 years onwards should undergo PAP smear screening (6).
Recent advances (19) achieved thanks to lower-intensity conditioning regimens and improvements in supportive therapy following alloHSCT are allowing more and more transplant recipients to survive for long periods. This means that long-term complications are becoming more and more significant. Long-term follow-up of alloHSCT patients is a challenge and requires close cooperation between primary care physicians, other specialists in private practice, transplant recipients, and transplantation centers. Various factors are hindering structured follow-up care. These include long distances between patients’ homes and transplant centers, lack of reimbursement of transport costs, staff shortages or turnover, and inadequate remuneration, in addition to a lack of knowledge and awareness of the long-term sequelae of alloHSCT (40). In adolescents, the transition from pediatric to adult care is often difficult but can be made easier with joint transitional doctors’ appointments.
Knowledge of the long-term sequelae of alloHSCT allows for tiered intervention. This involves counseling and educating patients, regular screening, and prompt treatment of long-term sequelae. A compromise should be sought between use of practical and financial resources on the one hand and the closest possible clinical monitoring on the other. Tailor-made, risk-adapted, comprehensive follow-up programs should be put together for all patients after alloHSCT and discussed perspicuously with patients. In addition, a special follow-up card for transplant recipients might improve and structure long-term follow-up. In view of the serious effects of GVHD on long-term outcomes and their complexity, multidisciplinary treatment in specialized outpatient departments at transplant centers is desirable.
In addition to prospective studies, long-term outcomes should be systematically documented using multicenter registry studies, in order to optimize the management of long-term alloHSCT survivors in the future too.
Prof. Wolff is backed by the German José Carreras Leukemia Foundation.
Conflict of interest statement
Dr. Hilgendorf has received lecture fees from MSD and Gilead.
Prof. Dr. Wolff has received research funding from Novartis.
The other authors declare that no conflict of interest exists.
Manuscript received on 22 May 2014, revised version accepted on 21 October 2014.
Translated from the original German by Caroline Devitt, M.A.
PD Dr. med. habil. Inken Hilgendorf
Internal Medicine Clinic II
Department of Hematology and Internal Oncology
Section for Stem Cell Transplantation
Jena University Hospital
Erlanger Allee 101
07747 Jena, Germany
@For eReferences please refer to:
DRST Jahresbericht 2013. www.drst.de/download/jb2013.pdf (last accessed on 13 November 2014).
University Clinic of Internal Medicine I, Medical University of Vienna, Austria: Prof. Dr. med. Greinix
Department of Hematology, University Hospital of Basel : PD Dr. med. Halter
St. Anna Children’s Hospital, Vienna, Austria: Dr. med. Lawitschka
Department of Hematology, Oncology, and Stem-Cell Transplantation, Medical Center – University of Freiburg: Prof. Dr. med. Bertz
Department of Internal Medicine III, University Hospital Regensburg : Prof. Dr. med. Wolff
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