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June 1994, Volume 44, Issue 6

Original Article

A Morphological Pattern of 234 Cases of Leukemias

Khalid Hassan  ( Department of Pathology, Rawalpindi Medical College, Rawalpindi. )
Nadeem Ikram  ( Departments of Pathology, Rawalpindi Medical College, Rawalpindi. )
Sajid Hussain Shah  ( Departments of Pathology, Rawalpindi Medical College, Rawalpindi. )

Abstract

Morphological pattern of 234 consecutive cases of various types of leukemias is presented. Acute leukemias (62.8%) were commoner than chronic (37.2%). Amongst acute leukemias, myoloid leukemias (AMI) were more frequent as compared to lymphoblastic (ALL). AML:ALL ratio was 2.57:1 in adults and 1:3 in children. Amongst AML cases, M4 was the commonest, followed by M2, Mi, M3 and M4 and M6 and M7 respectively. In ALL patients, Li was the commonest, followed by L2 and L3 respectively. Amongst chronic leukemias, myelocytic leukemia (CML) was more common than lymphocytic leukemia (CLL) with a CML:CLL ratio of 3.1 :1. In a total of 60 CML cases, two had juvenile CML, four were between 10 and 15 years of age and the remaining 54 were adults. Hairy cell leukemia (2 cases) and lymphoma/leukemia syndrome (5 cases) were uncommon (JPMA 44:145, 1994).

Introduction

Leukemias comprise of a heterogenous group of malignancies arising from the marrow cells. In a study on 2,220 malignant tumours in Faisalabad, haematological malignancies were the second commonest in males (11.62%) and seventh (4.0%) in females1. In another study at AFIP, Rawalpindi, leukemias were the second commonest malig­nancy (9.09%) in males and fourth (4.53%) amongst females. According to the third national survey in USA, leukemias constituted 30.1% of malignancies during childhood3. In Pakistan also, leukemias are the commonest malignancies in childhood, constituting 35% to 38.5% of malignancies occurring below 15 years of age2,4. Leukemias are broadly classified into acute and chronic types, depending on the mode of onset, clinical course of the disease, cytological features of the leukemic cells, response to therapy and prognosis. For acute leukemias, French-American-British (FAB) classification is now widely accepted5,6. Acute leukemias are thus classified as acute lymphoblastic leukemias (ALL- Li, L2 and L3) and acute myeloid leukemias (AML - Mi, M2, M3, M4, M5, M6 and M7). Whereas acute lymphoblastic leukemias are more common in children7, acute myeloid leukemias are commoner in adults8. Chronic myeloid leukemia (CML) is characterized by malignant proliferation of myeloid series cells9 and is a clonal disorder of pleuripotent haemopoietic stem cells10. CML comprises about 20% of all cases of leukemia in the west11. Chronic lymphocytic leukemias (CLL), which are the commonest types of leukemias in the Western world12, are relatively less frequent in Pakistan. Prolym­phocytic leukemia and hairy cell leukemia are now recognised as distinct entities. Furthermore, various types of non-Hodgkin’s lymphomas after bone marrow infiltration may present in a leukemic phase, i.e., lym­phoma/leukemia syndrome13. This taper - a continuation of our previous studies14-17 describes the morphological pattern of cases of acute and chronic leukemias.

Patients and Methods

Patients
This study includes 234 consecutive cases of all types of  leukemias, which were diagnosed at Pathology Department of Rawalpindi Medical College, Rawalpindi, during nine years (from January, 1985 till December, 1993).
Methods
A detailed clinical data was recorded in every patient with particular reference to age, sex, pallor, fever, bleeding manifestations, hepatomegaly, splenomegaly, lymphadenopathy, bone tenderness and jaundice.
Laboratory Investigations
About 5.0 ml of blood was drawn in a disposable syringe. It was transferred into an EDTA vial and was mixed gently and thoroughly. The following investiga­tions were carried out in every patient: haemoglobin estimation by cyanmet-haemoglobin method; white cell count, red cell count and platelet count by visual methods, using improved Neubauer chamber and dif­ferential leucotyte count after staining with May-Grun­wald-Giemsa stain. Bone marrow aspiration was performed in all the patients, using Saleh’s bone marrow aspiration needle. In every case, atleast six smears were made and two of them were stained by May-Grunwald- Giemsa stain.
Special Stains
In cases of acute leukemia, bone marrow smears were also stained by PAS, Sudan Black stain and Nephthyl Acetate Esterase stains. In CML, when­ever required, peripheral smears were stained for leucocyte alkaline phosphatase. For all the special stains, commercially available kits (Sigma) were used. For acute leukemia, we used French-American-British (FAB) classification. One of the cases of acute myeloid leukemia who showed negative PAS, Sudan Black and Naphthyl Acetate Esterase stains was diag­nosed as AML-MO which is not a FAB type of AML.

Results

In a total of 2,310 patients who underwent a marrow aspiration at Pathology Department of Rawalpin­di Medical College, from January, 1985 till December, 1993, 234 were diagnosed as having various types of  leukemias.

Table I shows the morphological breakup of these patients. Acute leukemias (62.8%) were more common as compared to chronic (37.2%), with an acute leukemia: chronic leukemia ratio of 1.7:1. Amongst 148 cases of various histological types of acute leukemias, 81 (54.7%) showed AML, whereas ALL was seen in 67 cases (45.3%). All cases of AML and ALL were classified according to FAB (French-American-British) criteria (Table I). In 81 cases of AML, M4 was the commonest (29.6%), followed byM2 (25.9%), Ml (18.5%), M3 and MS (11.1% each) and M6 and M7 (1.2% each) respectively. Amongst 67 cases of ALL, Li was the commonest FAB type (61.2%) followed by L2 (34.3%) and L3 (4.4%) respectively. Various types of chronic leukemias were diagnosed in87 cases; 60 (68.9%) of them had CML, 20(23%) CLL, 2 (2.3%) hairy cell leukemia and 5 (5.7%) leukemic transformation of non-Hodgkin’s lymphoma (lym­phoma/leukemia syndrome). In a total of 60 cases of CML, 2 (3.3%) had Juvenile CML (age below one year), four (6.6%) manifested CML between 10 and 15 years and the remaining 54 (90%) were above 15 years of age. The AML:ALL ratio (the ratio between the number of AML and ALL patients) was 1.21:1. This ratio was higher in aduhs (2.57:1), as compared to children i.e., <15 years age (1:3). Likewise CM1:CLL ratio was 3.1:1 (Table II).

Amongst AML patients, 79% were adults and 21% children (<15 years). On the contrary, in ALL, 28% were adults and 72% children (<15 years).

Table III shows the ranges and mean± SD values of age representation of patients having AML, ALL, CML and CLL. The peak incidences of various types of leukemias were as follows: ALL-- 1-5 and 11-15 years; AML-- 11-30 years; CML--31-40 years and CLL-- 61-70 years. ALL, AML and CLL were more common in males, whereas in CML, males and females were equally affected (Table IV).

Discussion

Leukemias are broadly classified as acute and chronic types. For acute leukemias, FAB classification is now widely accepted. In the present study, 234 cases of various types of acute as well as chronic leukemias were classified on the basis of cell morphology. In case of acute leukemias, the diagnosis was supported by cytochemical staining procedures. Acute leukemias were more com­mon (62.8%) ,as compared to chronic leukemias (37.2%).

Table V compares the distribution of FAB types of AML in the present study with some previous reports from within Pakistan and abroad. M2 is the commonest FAB type of AML8,18-20; however, in the present series, M4was the commonest. This findingisin conformitywith the report by Miguel et al21. In our cases, M2 was the second commonest AML FAB type, followed by M1 and M3 as well as M5 respectively.

In Table VI, the distribution of ALL cases according to FAB classification was compared with some previous reports. In the present series, Li was the commonest FAB type, followed by L2 and L3, respectively. Similar pattern has also been reported in other series19,22-28. AML occurs twice as often as ALL, the vast majority of cases occurring in adults29. In children, ALL is much more common, accounting for approximately 80% of leukemias, followed by AML (17%) and chronic myelogenous leükemias (about 3%), respectively7. In the present series, AML was observed more commonly in adults (79%) as compared to children (2i%), whereas ALL was commoner in children (72%) as compared to in 28% amongst adults. Amongst the chronic leukemias, in the present study, CML was the commonest (68.9%), followed by CLL (23%). CML:CLL ratio was 3.1:1. In a total of 60 cases of CML, 54 (60%) had adult type of CML; four cases (6.6%) were between 10 and 15 years of age and two (3.3%) had juvenile CML presenting below the age of one year. CLL was diagnosed in 20 cases, thus constituting 23% of chronic leukemias.

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