|Year : 2018 | Volume
| Issue : 1 | Page : 49-56
Presentation and survival in patients with hematologic malignancies in Jos, Nigeria: A retrospective cohort analysis
Ochaka J Egesie1, Patricia A Agaba2, Olugbenga A Silas3, Chad Achenbach4, Ayuba Zoakah5, Oche Agbaji6, Jeremiah A Madaki2, Edith N Okeke6, Lifang Hou7, Atiene A Sagay8, Robert Murphy4
1 Department of Hematology and Blood Transfusion, University of Jos/Jos University Teaching Hospital, Jos, Nigeria
2 Department of Family Medicine, University of Jos/Jos University Teaching Hospital, Jos, Nigeria
3 Department of Histopathology, Jos University Teaching Hospital, Jos, Nigeria
4 Department of Medicine and Preventive Medicine, Feinberg School of Medicine, Northwestern University, Chicago IL, USA
5 Department of Community Medicine, Jos University Teaching Hospital, Jos, Nigeria
6 Department of Internal Medicine, Jos University Teaching Hospital, Jos, Nigeria
7 Department of Medicine and Preventive Medicine, Feinberg School of Medicine, Northwestern University, Chicago IL; Center for Population Epigenetics, Robert H. Lurie Comprehensive Cancer Center and Department of Preventive Medicine, Feinberg School of Medicine, Northwestern University, Chicago IL, USA
8 Department of Obstetrics and Gynaecology, Jos University Teaching Hospital, Jos, Nigeria
|Date of Web Publication||29-May-2018|
Dr. Patricia A Agaba
Department of Family Medicine, University of Jos/Jos University Teaching Hospital, P.M.B 2076, Jos, Plateau State
Source of Support: None, Conflict of Interest: None
Background: Hematologic malignancies cause significant morbidity and mortality and are not uncommon in resource-limited low-income countries. However, the types, pattern of presentation, and treatment outcomes vary across regions. We assessed the presentation and overall survival (OS) over an 11-year period in adult patients with hematologic cancers in Jos, North Central Nigeria.
Materials: and Methods This retrospective outcome study evaluated patients who presented with hematologic malignancies between 2005 and 2015 at the Jos University Teaching Hospital, Jos. Variables of interest were abstracted through chart reviews. Descriptive statistics were used to evaluate baseline and follow-up parameters. OS was assessed by using Kaplan–Meier method.
Results: Sixty patients, contributing 25,994 person-days of follow-up were evaluated. The mean age was 43 ± 17 years and 61.7% were males. Thirty-one patients (51.7%) presented with leukemia, 45.0% with lymphoma, and 3.3% with multiple myeloma. Forty-two (70.0%) presented with advanced disease, 5 (5.2%) were human immunodeficiency virus positive and 4 (6.7%) had died at the end of follow-up. OS was 84.3% (95% confidence interval: 58.1–94.7). Survival differed by disease group (P = 0.01) and having fever at presentation (P = 0.02).
Conclusion: We found long-term OS to be impacted by disease type and status of fever at presentation. Disease-specific strategies to improve early diagnosis and therapies are needed to ensure optimal outcomes in Nigerian patients.
Keywords: adults, blood cancers, long-term, mortality, pattern
|How to cite this article:|
Egesie OJ, Agaba PA, Silas OA, Achenbach C, Zoakah A, Agbaji O, Madaki JA, Okeke EN, Hou L, Sagay AA, Murphy R. Presentation and survival in patients with hematologic malignancies in Jos, Nigeria: A retrospective cohort analysis. J Med Trop 2018;20:49-56
|How to cite this URL:|
Egesie OJ, Agaba PA, Silas OA, Achenbach C, Zoakah A, Agbaji O, Madaki JA, Okeke EN, Hou L, Sagay AA, Murphy R. Presentation and survival in patients with hematologic malignancies in Jos, Nigeria: A retrospective cohort analysis. J Med Trop [serial online] 2018 [cited 2018 Dec 15];20:49-56. Available from: http://www.jmedtropics.org/text.asp?2018/20/1/49/233428
| Background|| |
Hematologic malignancies are malignant neoplasms arising from hemopoietic tissues. They comprise largely of malignancies like leukemia, lymphoma and multiple myeloma, of which leukemia and lymphoma are the most common globally., Hematologic malignancies comprise a fifth of the most commonly occurring cancers and the second leading cause of cancer deaths., Leukemia was the fifth most common cause of cancer deaths in men and the sixth most common in women in the United States in a 5-year study between 2007 and 2011.
Hematologic malignancies were previously thought to be rare in north central Nigeria due to misdiagnosis, poor understanding of their pathogenesis and clinical presentation. No study has been conduct to understand the epidemiology of these diseases in Northern Nigeria. In most cases the etiology remain largely unknown. However, several factors have been identified to increase the risk of developing these cancers, including immunosuppression or immunodeficiency states,, infections with viruses such as human immunodeficiency virus (HIV), Epstein Barr virus, human T-lymphotrophic virus, and chronic bacterial infection like Helicobacter pylori. These immune-related risk factors are thought to be involved in a complex interplay of genetic damage in somatic cells arising from mutations or other defects, cytokine dysregulation and chronic antigenic stimulation resulting in development of these malignancies. Presentations of these cancers are usually nonspecific and may be influenced by associated factors like level of awareness of affected individuals, the type of the disease and other comorbidities. The outcomes in hematologic malignancies can also vary by time of presentation, type of the disease, stage of the disease at presentation, other comorbidities, availability and quality of the access to medical care.
The objective of this study was to determine the pattern of clinical presentation, and overall survival (OS) of adult patients seen with hematologic malignancies between 2005 and 2015 in the Jos University Teaching Hospital (JUTH), Jos, North Central Nigeria.
| Materials and methods|| |
JUTH is a tertiary institution located in Jos, the capital city of Plateau State, North-Central Nigeria. It is a 550-bed facility and serves five neighboring states within the region. It offers specialist hematological services on both in and outpatient basis. The patients in this study were referred from clinics within the hospital, and from health facilities within the region between January 2005 and December 2015. The hematologists at the Department of Hematology and Blood Transfusion managed the patients, where all the cases were recorded in the case registry.
This was a retrospective cohort study to determine the clinical presentation, and OS of adult patients seen with hematologic malignancies at the JUTH over an 11-year period.
There were 121 cases recorded in the case register of the department of hematology and blood transfusion over the study period. The inclusion criteria were those on the register with documentation of diagnosis by bone marrow aspiration cytology or histology of tissue biopsy. Fifty-nine cases were excluded from this analysis for failure to meet the inclusion criteria as indicated in the flow chart [Figure 1].
Chart reviews were conducted and data were captured on a designed template. Information extracted included sociodemographic parameters, clinical features, hematologic parameters, histologic/cytological diagnosis, and disease staging. Additionally, information on date of diagnosis, treatment status, and regimen received were captured. HIV status and baseline hematological parameters were also abstracted. For patients who received chemotherapy, treatment was classified into single-agent alkylator therapy (± steroid), non-purine analog based combination, antibody-only or other therapy. Time spent in follow-up (days) was calculated from the date of histologic/cytological confirmation of disease until the end of follow-up (31st December 2015) or the occurrence of death (all-cause mortality), which was the outcome of interest as documented in the case files. We used the following definitions to assess baseline hematological parameters: (1) anemia-defined as hematocrit <30%, (2) leukocytosis-defined as total white cell count >10 × 109/L, (3) thrombocytopenia as absolute platelet count <90 × 109/L. The hematologic malignancies were classified into three disease groups namely lymphoma, leukemia, and myeloma. We further grouped these conditions into early or late stage as follows; for chronic myeloid leukemia (CML), early stage disease was chronic phase, while late disease was either accelerated or acute phase or blastic transformation. For chronic lymphocytic leukemia (CLL), early disease was Binet A, while late disease was Binet B or C. For lymphoma, early disease was stage IA or IIA, while late disease was stage IIB, III or IV.,
Descriptive statistics was used to present baseline data, and they were expressed as proportions, mean (± standard deviation), and median [interquartile range (IQR)] as appropriate. The burden of hematologic malignancies was estimated using the number of all cancers that presented at JUTH during the same period as reference population. Bivariate analysis was used to describe the association with sociodemographic features and burden of hematologic malignancies in JUTH. Outcome was assessed based on status of patients, whether alive or dead at the last visit or follow-up. OS was assessed by using Kaplan–Meier method. STATA version 13.1 software package (STATA Corp, College Station, Texas) was used for the statistical analysis. A P-value <0.05 was considered significant.
| Results|| |
Sixty patients with hematologic malignancies were included in this study. The mean age of the study population was 43 ± 17 years. Majority (61.7%) were males, and most (86%) of the patients received formal education. About two-thirds (65.5%) were married, and 50.8% were employed at the time of presentation [Table 1]. Majority (71.2%) of the patients presented late, and the main clinical features they presented with were lymph node enlargement (63.2%), fever (48.3%), splenomegaly (47.4%), and hepatomegaly (42.1%).
|Table 1: Sociodemographic characteristics of adults with hematologic malignancies seen at the Jos University Teaching Hospital, Nigeria between 2005 and 2015 (n = 60)|
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Hematologic malignancies constituted 4.4% of all malignancies at JUTH within the study period. The annual burden of hematologic malignancies was 0.4%. Among the hematologic malignancies, the highest burden was for leukemia (51.7%), and then lymphoma (45.0%), while multiple myeloma made up only 3.3%. The distribution of histologic diagnosis of the various malignancies is shown in [Figure 2]. Non-Hodgkins lymphoma accounted for 38.3% of histologic diagnoses, followed by CML (26.7%) and CLL (20.0%). Other histologic types occurred in lower frequencies as shown in the doughnut plot.
|Figure 2: Doughnut plot of distribution of cases of hematologic malignancies by histologic type in adults seen at the Jos University Teaching Hospital, Nigeria between 2005 and 2015 (n = 60)|
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With regards to cytotoxic therapy, 86.2% received chemotherapy comprising nonpurine analog-alkylating agent-based combination in 38%, single-agent alkylator therapy (± steroid) in 32% and antibody-only or other therapy in 30% of those that accessed specific treatment.
The median follow-up time for the whole cohort was 182 (IQR: 50–737) days. Patients with leukemia had shorter median follow-up periods (75, IQR: 21–382) compared to the patients with lymphoma (398, IQR: 103–1221) and multiple myeloma (161, IQR: 73–249), P = 0.03.
Fifty-seven of the 60 patients had complete time-updated data and contributed 25,994 days of follow-up at the end of the observation period. OS was 84.3%; 95% confidence interval: 58.1–94.7% [[Figure 3]a]. When survival was stratified by sociodemographic and clinical variables, survival function differed only with disease group (P = 0.01, [Figure 3]b) and fever (P = 0.02), with age achieving borderline significance [Table 2].
|Figure 3: Kaplan–Meier estimates of overall survival (a) and survival by disease group (b)|
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|Table 2: Stratified survival analysis by sociodemographic characteristics (n = 60)|
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| Discussion|| |
Hematologic malignancies are not as rare in our environment as previously thought. These conditions are responsible for significant morbidity and mortality in individuals affected. In this study, they represented 4.4% of all cancer cases presenting in JUTH within the period under review and an annual burden of 0.4%. This burden of disease observed was lower than that reported by Kagu et al. in Maiduguri, North Eastern Nigeria where an overall burden of 6.05% was reported. The burden in our study was also lower than that reported from a study in Benin, South Southern Nigeria, where 17.4% burden was observed.
While non-Hodgkin’s lymphoma was the most frequent type of hematologic malignancy seen in the studies from Maiduguri and Benin, Nigeria,, the most frequent hematologic malignancy observed in our study was leukemia. This has confirmed previous findings of geographical variation in the pattern of hematologic malignancies even within the same country., The finding of leukemia as the most frequently occurring hematologic malignancy in this study was, however, similar to the report by Idris et al. in Abbottabad, Pakistan and in another study from Bangladesh. The mean age at presentation in this study was 47 ± 17 years. Our patients presented at an older age compared to the patients in a Pakistani study that presented at a younger age of 22.5 years. The age at presentation in our patients is, however, similar to that described in patients from an Ethiopian study. A male preponderance was observed in this study, wherein the male patients constituted 61.7% of the cases, while the females constituted only 38.3% of patients giving a male-to-female ratio of 1.6:1. This is in agreement with previous studies that reported the tendency of hematologic malignancies to occur more frequently in males than females.,,
The spectrum of clinical presentation in patients with hematologic malignancies varies depending on the type and stage of disease at which diagnosis was made. While some patients are asymptomatic, others present with symptoms attributable to effects of cytopenia and/or organ enlargement from infiltration with malignant cells. In this study, majority of the patients presented with lymph node enlargement. This is at variance with some studies, in which the most common features at presentation were nonspecific features of cytopenias (fatigue, fever, and bleeding tendency)., Other less frequent features such as splenomegaly and hepatomegaly seen in our patients have also been described in a study among aviators in India. In addition, nonspecific features including fever and bleeding tendencies, which were described in patients from other studies, were also seen in our patients. The most frequent abnormal laboratory finding in our patients in this study was leukocytosis. This was contrary to the finding reported in a study from Nepal, in which 90% of the patients with hematologic malignancies presented with cytopenias such as bicytopenia and pancytopenia. Cytopenias are reflection of the extent of bone marrow inadequacy resulting from infiltration of the bone marrow with the malignant cells. Leukocytosis was commonly seen among patients in this study and was closely followed by anemia, a manifestation of cytopenia. Thrombocytopenia was not a frequent presentation in our patients as reported elsewhere.
In this study, 5.2% of the patients were positive for HIV. All those with a positive HIV status were found in the lymphoma group. This prevalence of HIV was higher than that reported in a study performed in Ile-Ife, Southwest Nigeria among lymphoma patients, in which 2.3% of the patients were HIV positive, but lower than the reported 26.5% positive HIV status in another study from Cameroon. The difference in HIV positive status may be explained by the regional variation of HIV prevalence in the general population. The finding of HIV positive status among the lymphoma cohort confirmed previous reports of infections with viruses such as HIV as risk factor for the development of lymphoma., Interestingly, no patient with leukemia, which had the highest burden for hematologic malignancies in our study, was HIV positive.
Late presentation was also observed among this cohort of patients, with 70.0% presenting with advanced stages of their disease. Patients with malignancies in resource-limited settings have been documented to present late. In a recent study of women with invasive cervical cancer from this center, 87.5% of the cases presented with advanced disease. A study on acquired immunodeficiency syndrome-related lymphoma conducted in southwest Nigeria also documented majority of the patients presenting in advanced stages of the disease. The reasons for the late presentation of hematologic malignancies in our setting are multi-factorial, and ranges from patient factors, to delays in referral as well as paucity of adequate screening, diagnostic and therapeutic facilities.,,,We found overall 11-year survival to be high in our cohort, with differences in survival rate by disease group. Patients with leukemia had the lowest probability of survival compared to those with lymphoma and multiple myeloma. The factors that impact on cancer survival are usually clinical and disease related but a recent publication on survival in hematologic cancers among young persons reported social factors having a negative impact on cancer survival.,
A key strength of our study is the fact that we reported on an 11-year survival among patients with hematologic malignancies in a resource-limited setting and found OS to be over 80%. However, our study had some limitations. Firstly, the use of routine clinical data resulted in our inability to assess additional outcome measures (like rates of remission and disease free survival) due to missing/incomplete data. This limited our survival analysis to OS alone. We were, however, able to compare patients who were excluded due to missing data and those included in our final analyses and found them to have similar sociodemographic and disease characteristics. A prospective cohort will enable us fill in the gaps experienced in this study. Secondly, we were limited by the use of institutional data as there are no local cancer registries that would have enabled us compare trends in incidence and outcome. We do believe, however, that because the patients presented in this study were drawn from multiple centers/sites, our results are a fair representation of OS and can be generalized to our setting. Thirdly, our classification of the various cancers into three broad groups (leukemia, lymphoma, and myeloma) may have resulted in under and or over estimation of survival rates for some of the patients. Using grouping by histologic type may have been better.
In conclusion, this study has shown that hematologic malignancies are not uncommon in our environment, and that OS is over 80%, even in the face of limited cancer management resources. We also observed similar disease patterns as have been previously documented in prior studies. The findings of this study can be used as a guide to plan future prospective studies that will enable the collection of more comprehensive data, which will speak to some of the limitations encountered in this study and enable better planning and implementation of cancer prevention and treatment programs.
We are grateful to the patients who contributed data to this study and the staff of the health records department for case file retrieval.
Financial support and sponsorship
This study was supported by Northwestern University and Jos University Research Training Program in HIV and Malignancies (award number D43TW009575) from the Fogarty International Center, National Institutes of Health (NIH), USA. The content is solely the responsibility of the authors and does not necessarily represent the official views of the Fogarty International Center or the National Institutes for Health.
Conflicts of interest
There are no conflicts of interest.
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[Figure 1], [Figure 2], [Figure 3]
[Table 1], [Table 2]