|Year : 2019 | Volume
| Issue : 3 | Page : 362-367
Initial lymphocyte count's predictive value in immune thrombocytopenic purpura
Salwa S El-Din El-Gendi, Wael A Abbas, Dolagy N Naguib
Department of Internal Medicine, Assuit University, Assuit, Egypt
|Date of Submission||23-Dec-2018|
|Date of Acceptance||10-Jun-2019|
|Date of Web Publication||23-Sep-2019|
Dolagy N Naguib
Department of Internal Medicine, Assuit University, Assuit
Source of Support: None, Conflict of Interest: None
The objective of this study was to examine whether absolute lymphocyte count (ALC) at diagnosis correlates with the course of immune thrombocytopenia purpura (ITP) and could be considered as a prognostic factor in adults and children.
Patients and methods
A retrospective study of 250 patients diagnosed as having primary ITP, including 150 adult patients and 100 children, was conducted between July 2013 and July 2018 at Hematology Department and outpatient clinic.
A highly significant decrease in mean ALC was noted in chronic ITP adult cases (1.55 ± 0.69) compared with newly diagnosed ITP cases (2.99 ± 1.23) (P = 0.000). Moreover, ALC less than 2.050/mm3 was associated with a significant risk for developing chronic ITP (P = 0.000), as only eight (26.7%) cases with ALC less than 2050/mm3 developed newly diagnosed ITP, whereas 97 cases with ALC less than 2050/mm3 (80.8%) developed chronic ITP. Thus ALC less than 2050/mm3 is considered a significant risk factor for developing chronic ITP in adults. In contrast, mean ALC in pediatric cases showed a significant decrease in chronic ITP cases (2.55 ± 1.01) compared with newly diagnosed cases (3.68 ± 1.34) (P = 0.000). Moreover, ALC less than 2050/mm3 was associated with a significant risk for developing chronic ITP (P = 0.001), as only one case less than 2050/mm3 (2.5%) developed newly diagnosed ITP, whereas 17 cases less than 2050/mm3 (28.3%) developed chronic ITP.
ALCs at diagnosis is statistically a strong predictor of the development of chronic ITP in adult and pediatric patients. ALC at cutoff less than 2050/mm3 is considered a significant risk factor for developing chronic ITP in adults and pediatric cases (P = 0.000 and 0.001, respectively).
Keywords: immune thrombocytopenic purpura, Initial lymphocyte counts, prognostic factors
|How to cite this article:|
El-Din El-Gendi SS, Abbas WA, Naguib DN. Initial lymphocyte count's predictive value in immune thrombocytopenic purpura. J Curr Med Res Pract 2019;4:362-7
|How to cite this URL:|
El-Din El-Gendi SS, Abbas WA, Naguib DN. Initial lymphocyte count's predictive value in immune thrombocytopenic purpura. J Curr Med Res Pract [serial online] 2019 [cited 2020 Mar 28];4:362-7. Available from: http://www.jcmrp.eg.net/text.asp?2019/4/3/362/267670
| Introduction|| |
Immune thrombocytopenia purpura (ITP) is an acquired autoimmune disorder characterized by increased platelet destruction and decreased platelet number .
Primary immune thrombocytopenia is an acquired immune disorder characterized by an isolated thrombocytopenia owing to pathogenic antiplatelet autoantibodies, T-cell-mediated platelet destruction, and impaired megakaryocyte function ,.
It is associated with the production of autoantibodies directed against platelet glycoprotein complex IIb/IIIa and Ib/Ix, resulting in accelerated destruction of platelets by the reticular endothelial system via the activity of Fcγ- receptor-bearing phagocytic cells .
Studies have demonstrated that the pathogenesis of ITP involves multifactorial autoimmune mechanisms of both humoral and cellular immunity and that acute and chronic forms may represent two distinct immunopathological disorders ,.
It can be observed in both adults and children, with both sexes being affected ; however, the underlying mechanisms of pediatric ITP compared with adult ITP may be differen ,,.
There are three phases of the disease :
- Newly diagnosed ITP: for all cases at diagnosis.,
- Persistent ITP: for patients with ITP between 3 and 12 months
- Chronic ITP: for patients with ITP lasting more than 1 year.
ITP is usually chronic in adults, and the probability of durable remission is 20–40% ,.
At least 70% of childhood cases will end up in remission within six months, even without treatment ,,.
The treatment strategies consist of stimulating platelet production to increase the platelet counts, increasing platelet half-life, and decreasing the autoreactive nature of the immune response by targeting the autoreactive antibody production and the platelet destruction. ,.
Although lymphocytopenia is a commonly reported feature of many chronic autoimmune disorders, differential white cell counts at presentation have seldom been evaluated as predictors for development of chronic ITP ,.
| Patients and Methods|| |
A retrospective study was performed at Hematology Unit of Internal Medicine Department and outpatient clinic, Assiut University Hospital, and Hematology Department and outpatient clinic, Assiut University Children Hospital, to assess the role of absolute lymphocyte counts (ALCs) at diagnosis as a prognostic factor in the course of ITP.
Data sheets of 250 patients diagnosed as having primary ITP between July 2013 and July 2018 at Hematology Department and outpatient clinic were retrospectively evaluated.
The following were the inclusion criteria: primary ITP cases with full datasheet recorded, including age, sex, clinical presentation, complete blood count at diagnosis, bone marrow aspirate (BMA) if done, serology and autoimmune profile, and available follow-up data to determine whether the patient is newly diagnosed or has chronic ITP.
The following were the exclusion criteria:
- Secondary ITP cases, secondary to the following:
- Infectious diseases (hepatitis B or C, cytomegalovirus, HIV, and Helicobacter pylori)
- Immune disorders (systemic lupus erythematosus)
- Lymphoproliferative diseases (non- Hodgkin's lymphoma and chronic lymphoid leukemia)
- Cases without recorded enough data or without follow-up data.
Methodology and data collection
On reviewing the medical records of 600 patients with ITP admitted at the ward or followed up at the outpatient clinic of Hematology Department at Assiut University Hospital and Assiut University Children Hospital from 2013 to 2018 and excluding 350 cases according to the exclusion criteria, a total of 250 primary ITP cases were retrospectively evaluated and included in our study, which comprised 150 adult patients and 100 children.
The following data were collected and recorded:
- Demographic data: age, sex, and residence (if recorded)
- Clinical presentation: purpura, easy bruising, epistaxis, bleeding per gum, menorrhagia (in adult female), and intracranial hemorrhage
- Complete blood count at diagnosis, including total leukocytic count (TLC), ALC, platelet count, mean platelet volume (MPV), and hemoglobin (HB) level
- Autoimmune profile: antinuclear antibody and anti-double stranded DNA
- Serology for hepatitis B and C viruses
- BMA if done
- Duration of illness to determine whether the patient is newly diagnosed or has chronic ITP.
Data were collected and analyzed using statistical package for the social science, version 20 (IBM Corp., Armonk, New York, USA). Continuous data were expressed in the form of mean ± SD, whereas nominal data were expressed in the form of frequency (%). χ2-test was used to compare the nominal data of different groups in the study, whereas Student's t-test was used to compare mean of different two groups. P value was significant if less than 0.05.
| Results|| |
A total of 250 patients with primary ITP were included in our study, comprising 150 adult patients and 100 children, after reviewing more than 600 medical records of patients with ITP and excluding approximately 350 cases according to the exclusion criteria.
Adult cases data
Of 150 adult cases, 30 (20%) were newly diagnosed and 120 (80%) were chronic. There were 27 (18%) males and 123 (82%) females. Their age ranged from 19 to 73 years, and median age at diagnosis was 30 years. The mean age was 30.2 ± 6.71 years for newly diagnosed ITP and 34.1 ± 12.5 years for chronic ITP cases. Among the newly diagnosed ITP cases, 26 (86.7%) were younger than 50 years old and four (13.3%) were 50 years or older, whereas among chronic ITP cases, 100 (83.3%) were younger than 50 years and 20 (16.7%) were 50 years or older. According to WHO classification of age in Africa (2002), old age starts from 50 years or above.
Clinical presentation of cases is shown in [Figure 1] and [Figure 2].
BMA was done in 82 (54.7%) cases, revealing 10 (33.3%) as newly diagnosed ITP cases and 72 (60%) as chronic.
Data about TLC, ALC, platelet count, HB level, and MPV are mentioned in [Table 1], [Table 2], [Table 3].
|Table 1: Comparison between sex, age groups and cutoff points in total number of adult cases|
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|Table 2: Comparison between sex, age groups, and cutoff points in total number of pediatric cases|
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|Table 3: Comparison between newly diagnosed versus chronic ITP cases in children and adults according to various parameters|
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Pediatric cases data
Among the 100 pediatric cases, 40 (40%) were newly diagnosed and 60 (60%) were chronic. There were 53 (53%) males and 47 (47%) females. Their age ranged from 1 to 18 years, with median age at diagnosis of 6 years. The mean age was 4.2 ± 2.83 years for newly diagnosed ITP patients and 8.13 ± 4.08 years for chronic ITP patients. Among the newly diagnosed cases, 33 (82.5%) were younger than 6.75 years and 7 (17.5%) were 6.75 years or older, whereas among chronic ITP cases, 24 (40%) were younger than 6.75 years and 36 (60%) were 6.75 years or older.
Clinical presentation of cases is shown in [Figure 3] and [Figure 4].
BMA was done in 28 (28%) cases, among which seven (17.5%) were newly diagnosed and 21 (35%) were chronic.
Data about TLC, ALC, platelet count, HB level, and MPV are mentioned in [Table 1], [Table 2], [Table 3].
| Discussion|| |
A total of 250 primary ITP cases were retrospectively evaluated and included in our study, comprising 150 adult patients and 100 children. In adult cases, 20% were newly diagnosed and 80% were chronic. This was consistent with the study by Stevens et al.  who stated that ITP is usually chronic in adults, and the probability of durable remission is 20–40%.
In children, 40% were newly diagnosed and 60% were chronic. Treutiger et al. , stated that at least 70% of childhood cases will end up in remission within six months, even without treatment. Moreover, Akbayram et al. , in their study revealed that 74% of the patients had acute ITP and 26% had chronic ITP, which was inconsistent with our study.
This can be explained by the fact that our study is a retrospective study based on patients' data sheets of ward admission and outpatient clinic visits. Number of newly diagnosed cases is not indicative of the true incidence of cases, this is attributed to the fact that the nature of our study is retrospective and that data collected depends on availability of sheets of admission or follow up at out patient clinic, while patients with newly diagnosed ITP make less visits to the hospital. This makes their number in our study less than its true incidence.
Our study included 18% males and 82% females. It was consistent with Schoonen et al.  and Moulis et al.  who stated that there is a predilection for female patients in younger adults, but prevalence in men and women is fairly even in the elderly (>65 years).
Male:female ratio in our study was almost 1: 4. However, Cines and Bussel  stated that the ratio is 1:1.2–1.7. This difference could be attributed to the fact that our study is a retrospective one, including patients with enough follow-up data recorded, and not including all patients who developed ITP.
In our study, females developed chronic ITP more than males (83.7 and 63%, respectively, P= 0.015). Katja et al.  declared that females developed chronic ITP significantly more often.
Children in our study represented 53% males and 47% females, without significant sex preference, which was consistent with Cines and Bussel , as they stated that childhood cases are roughly equal for both sexes.
Age of the adult cases ranged from 18 to 73 years, with median age at diagnosis of ITP was 30 years. The mean age was 32.03 ± 11.59 years for newly diagnosed ITP and 35.61 ± 13.33 years for chronic ITP, with no significant difference in the mean age of cases, whether newly diagnosed and chronic ITP (P = 0.180). This was inconsistent with Cines and Bussel  and Abrahamson et al. , who considered median age at diagnosis of ITP was 55–60 years.
Age of the pediatric cases ranged from 1 to 17 years, with mean age of 4.2 ± 2.87 for newly diagnosed ITP and 8.12 ± 4.08 years for chronic ITP, with highly significant difference between newly diagnosed and chronic cases (P = 0.000). This was consistent with Katja et al.  whose study stated that chronic ITP cases were older than acute in pediatric study groups.
On examination of the marrow, an increase in the production of megakaryocytes may be observed and may help in establishing a diagnosis of ITP. On the basis of ASH 2011 guidelines, Neunert et al.  stated that BMA is not necessary done irrespective of age in patients presenting with typical ITP.
Our study focus was to determine the relation between ALC at diagnosis and the development of chronic ITP. A highly significant difference was found between means of ALC in adults, and also between ALC groups at cutoff 2050/mm3. The same results were also found in pediatric cases; thus, ALC less than 2050/mm3 is considered a major risk factor in developing chronic ITP in adults and children.
This was consistent with Akbayram et al. , whose study demonstrated that ALC values (ALC = or <2050/mm3) at presentation were independently predictive of disease duration. Of patients with an ALC less than or equal to 2050/mm3, 33.6% developed chronic ITP, whereas 22.4% of those with an ALC >2050/mm3 followed a chronic course in children.
Our study also found a significant difference between means of MPV in adults only, with mean of 8.9 ± 1.42 for newly diagnosed ITP and 9.75 ± 1.25 for chronic ITP, with a statistically significant difference (P = 0.001). This was consistent with Yildirmak et al. , who found a significant higher mean MPV of 9.2 fl in patients developing chronic ITP compared with a mean of 8.1 fl in patients with recovered ITP (P = 0.04). However, in pediatric cases, it was calculated with mean of 9.75 ± 1.21 for newly diagnosed ITP and 9.87 ± 1.37 for chronic ITP, without significantly different means (P = 0.664).
HB level mean was significantly different between newly diagnosed and chronic groups in pediatric cases only (P = 0.008). No previous study had been done to determine the relation with HB level and chronic ITP development.
Physicians and pediatricians may elect to manage newly diagnosed cases of ITP, but there will be a need to refer their patients to a hematologist once initial ALCs are low.
It could guide the decision on therapeutic management of the disease, especially if treatment would prevent development of chronic disease.
Further studies should be done to differentiate between the pathogenesis of newly diagnosed and chronic ITP and to find the cause of decreased ALC in chronic ITP.
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
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[Figure 1], [Figure 2], [Figure 3], [Figure 4]
[Table 1], [Table 2], [Table 3]