Journal List > Blood Res > v.56(1) > 1146585

Jain, Sharma, Khunger, Prasad, Gupta, Saluja, and Chaudhry: Acute lymphoblastic leukemia masquerading as acute myelofibrosis: a report of two cases and literature review
TO THE EDITOR: Unlike primary myelofibrosis (PMF), acute myelofibrosis (AMF) is a distinct clinicopathological entity characterized by the sudden onset of pancytopenia, extensive bone marrow (BM) fibrosis, megakaryocytic hyperplasia with or without dysplasia, leukoerythroblastic blood picture, and absence of hepatosplenomegaly (HSM) and no tear drop cells [1-8]. AMF is an uncommon presentation of acute myeloid leukemia (AML; particularly AML-M7), acute panmyelosis with myelofibrosis, and occasionally myeloproliferative neoplasm [especially chronic myeloid leukemia (CML)] [9, 10]. BM fibrosis has been reported in acute lymphoblastic leukemia (ALL) at diagnosis (B cell-ALL>T cell-ALL); although BM fibrosis has been shown to correlate with a low minimal residual disease (MRD)-negative rate at the end-of-induction (EOI) [11], AMF in association with ALL is extremely rare. AMF may be either concurrent with ALL or precede its onset. We present two cases of ALL that were preceded by AMF and a literature review.

Case 1

A 50-year-old man presented to our hospital in June 2018 with a two-month history of progressive fatigue. Past medical history was significant for diabetes mellitus, which was well controlled with antidiabetic medications. Examination revealed marked pallor and no HSM or lymphadenopathy. Complete hemogram revealed pancytopenia (hemoglobin, 6 g/dL; white cell counts, 3.25×109/L; and platelets, 78×109/L) without any atypical cells. BM aspiration (BMA) performed at an outside hospital in May 2018 was a dry tap. BM biopsy revealed extensive reticulin fibrosis [World Health Organization (WHO) grade 2] without any blasts (Fig. 1). He was managed symptomatically with blood transfusions. In July 2018, peripheral blood (PB) examination showed a left shift with 13% blasts. He did not have eosinophilia or basophilia. Moreover, BMA performed in July 2018 was a dry tap. BM biopsy revealed dense reticulin fibrosis (WHO grade 2) admixed with blasts. Findings of PB flow cytometry (FCM) were consistent with the diagnosis of precursor B-cell ALL (Pre-B ALL; Fig. 2A). BM cytogenetics could not be performed due to dry tap. Reverse transcription polymerase chain reaction (RT-PCR) using PB was positive for the BCR-ABL transcript (p190), whereas JAK-2, CALR, and MPL mutations were negative. He was treated with the European Working Group for Adult ALL (EWALL) protocol for Philadelphia-positive ALL (Ph+-ALL) along with imatinib. EOI BMA and biopsy (day-33) were in morphological remission, with significant resolution of BM fibrosis (WHO grade 0–1). Complete molecular remission was achieved at 3 months. However, the disease relapsed after 1 year, and he died 2 months after relapse.

Case 2

A 14-year-old boy presented to our hospital in May 2019 with complaints of high-grade fever and epistaxis for 1-month duration. Examination revealed marked pallor and no HSM or lymphadenopathy. Complete hemogram revealed pancytopenia (hemoglobin, 5 g/dL; white cell counts, 0.8×109/L; and platelets, 20×109/L). In March 2019, BMA performed at an outside hospital was a dry tap. BM biopsy revealed extensive reticulin fibrosis (WHO grade 3) without any immature cells or granuloma. In addition, in May 2019, repeat BMA performed at our hospital was a dry tap. BM biopsy revealed reticulin fibrosis (WHO grade II) with occasional immature cells [CD34+ and CD117+ on immuno-histochemistry (IHC)]. However, immature cells could not be characterized further by IHC. The patient was closely followed up and supported with transfusions when indicated. Fever work-up was inconclusive. The vitamin-D and parathyroid hormone levels were within normal limits, and antinuclear antibodies were absent. In June 2019, PB findings were unremarkable except for occasional blasts, FCM of PB was inconclusive, and BMA was a dry tap. BM biopsy revealed dense fibrosis (WHO grade 2), dysplastic megakaryocytes, and occasional blasts. The patient was managed symptomatically with transfusion support. In August 2019, BM was successfully aspirated from the sternum. FCM of BMA revealed early T-precursor ALL (ETP-ALL, Fig. 2B). BM cytogenetic analysis revealed a normal male karyotype. He was treated with the Berlin–Frankfurt–Münster (BFM)-95 protocol for ALL. EOI BMA and biopsy on day 33 revealed morphological remission and significant resolution of BM fibrosis (WHO grade 0–1). He was continued on chemotherapy and is currently in the maintenance phase.

DISCUSSION

We conducted a PubMed search using the key words “acute myelofibrosis” and “acute lymphoblastic leukemia” and found 11 articles (12 cases) describing an association of MF with ALL [2-8, 12-15]. However, full-texts of only nine articles were accessible [2, 4-8, 13-15]. Four patients did not have AMF and their clinical or pathological findings were consistent with the diagnosis of PMF (two patients: tear drop cells and two patients: hepatosplenomegaly) [13-15]. Thus, only seven cases of AMF with ALL (pediatric: 4 and adult: 3) have been reported till date (Table 1) [2-8]. AMF either preceded (N=3) or occurred concurrently with the diagnosis of ALL (N=4). AMF antedated the diagnosis of ALL by 3 months to 1 year [2, 4]. HSM and lymphadenopathy were absent in all patients (N=6). Blood counts at initial presentation revealed pancytopenia (N=3), bicytopenia (N=2), and anemia (N=1). At presentation, circulating blasts (3–7%) were detected in only two patients, both of which had concurrent AMF and ALL [5, 6]. In other patients, PB blasts were detected either during subsequent follow-up (N=1) [2] or were absent (N=3) [4, 7, 8]. ALL subtyping revealed that five patients had pre-B-ALL, with two co-expressing CD20. However, ALL subtyping for two patients was unavailable. Additional BM biopsy findings included megakaryocytic hyperplasia (N=2) and megakaryocyte dysplasia (N=3). Findings of cytogenetic analysis of BM were as follows: normal (N=3), abnormal (N=2; deletion 5, and extra signal on chromosome 21q22). After treatment with ALL induction protocols, five patients were alive, of which one experienced relapse, and one patient died during therapy. Three patients were reevaluated for BM fibrosis after therapy, of which one was positive and two were negative.
We reported two cases of ALL (pediatric ETP-ALL and adult Ph+-ALL). In these cases, AMF preceded the diagnosis of ALL by 5 and 3 months, respectively. No cases of ETP-ALL and Ph+-ALL presenting as AMF have been reported to date. Megakaryocyte dysplasia was present in case-2 patient. Most probably, cytokines released from lymphoblasts (megakaryocytes in case-2 patient) resulted in AMF in our patients [1, 8]. This is supported by the fact that BM fibrosis significantly reduced after ALL treatment. Secondary MF is commonly observed in CML at diagnosis [16]. Absence of HSM, eosinophilia, basophilia, dwarf megakaryocytes in the BM, and a relatively short history argued against the possibility of CML with lymphoid blast crises in case-1 patient; hence, the diagnosis of Ph+-ALL was favored. The diagnosis of ALL was delayed because the BM was inaspirable due to AMF and PB blasts were absent at presentation. Initial BM biopsies revealed only MF without any blasts. Subsequently, PB blasts were detected in both patients (case-2: 4 mo and case-1: 3 mo), which raised the suspicion of acute leukemia. Circulating blasts accounted for <20% in both patients, making PB FCM analysis difficult. Both patients required multiple transfusions during induction therapy and experienced grade-4 cytopenia. However, both patients did not have neutropenic fever and achieved morphological remission at EOI. Moreover, case-1 patient achieved molecular remission.
The current report highlights that AMF can either occur concurrently with or precede the diagnosis of acute leukemia. In the latter case, after excluding the secondary causes of MF and PMF, the suspicion of acute leukemia masquerading as AMF should be maintained. The diagnosis and subtyping of acute leukemia is frequently delayed either due to technical challenges in obtaining BM aspirate, absence of blasts in the initial BM biopsies, or low percentage of PB blasts during subsequent follow-ups, mandating close follow-up of the patients. Because dense BM fibrosis can mask the blasts, IHC analysis should be performed for immature cells in cases of AMF. Repeat BM examinations, particularly from different sites, may aid in obtaining sufficient sample for FCM analysis. ALL treatment usually results in AMF resolution. A limited number of patients preclude the evaluation of the effect of AMF on the EOI MRD and prognosis. Thus, we reported a rare presentation of ETP-ALL and Ph+-ALL and their diagnostic challenges.

ACKNOWLEDGMENTS

We thank Mr. Ashok Kumar and Mrs. Anita Yadav for their help with flow cytometry.

Notes

Authors’ Disclosures of Potential Conflicts of Interest

No potential conflicts of interest relevant to this article were reported.

REFERENCES

1. Tefferi A. 2018; Primary myelofibrosis: 2019 update on diagnosis, risk-stratification and management. Am J Hematol. 93:1551–60. DOI: 10.1002/ajh.25230. PMID: 30039550.
pmid
2. Amjad H, Gezer S, Inoue S, et al. 1980; Acute myelofibrosis terminating in an acute lymphoblastic leukemia: a case report. Cancer. 46:615–8. DOI: 10.1002/1097-0142(19800801)46:3<615::AID-CNCR2820460331>3.0.CO;2-X. PMID: 6930986.
pmid
3. Chen JS, Lin DT, Chuu WM, Lin KH, Su IJ, Lin KS. 1992; Acute myelofibrosis terminating in acute lymphoblastic leukemia: report of one case. Zhonghua Min Guo Xiao Er Ke Yi Xue Hui Za Zhi. 33:136–43. PMID: 1514403.
4. Dunphy CH, Kitchen S, Saravia O, Velasquez WS. 1996; Acute myelofibrosis terminating in acute lymphoblastic leukemia: case report and review of the literature. Am J Hematol. 51:85–9. DOI: 10.1002/(SICI)1096-8652(199601)51:1<85::AID-AJH14>3.0.CO;2-A. PMID: 8571944.
pmid
5. Abla O, Ye CC. 2006; Acute lymphoblastic leukemia with massive myelofibrosis. J Pediatr Hematol Oncol. 28:633–4. DOI: 10.1097/01.mph.0000212982.44243.80. PMID: 17006275.
pmid
6. Avcı Z, Malbora B, Gülşan M, Şahin FI, Celasun B, Özbek N. 2009; Acute massive myelofibrosis with acute lymphoblastic leukemia. Turk J Haematol. 26:204–6. PMID: 27265634.
pmid
7. Gonzalez MM, Kidd L, Quesada J, Nguyen N, Chen L. 2013; Acute myelofibrosis and acute lymphoblastic leukemia in an elderly patient with previously treated multiple myeloma. Ann Clin Lab Sci. 43:176–80. PMID: 23694793.
pmid
8. Friesenbichler W, Schumich A, Simonitsch-Klupp I, et al. 2018; Concurrent acute myelofibrosis and acute lymphoblastic leukemia in childhood: case report and review of the literature. J Pediatr Hematol Oncol. 40:235–7. DOI: 10.1097/MPH.0000000000000993. PMID: 29557917.
pmid
9. Bain BJ, Catovsky D, O'Brien M, et al. 1981; Megakaryoblastic leukemia presenting as acute myelofibrosis -- a study of four cases with the platelet-peroxidase reaction. Blood. 58:206–13. DOI: 10.1182/blood.V58.2.206.206. PMID: 6264993.
pmid
10. Verhoef GE, De Wolf-Peeters C, Ferrant A, et al. 1991; Myelodysplastic syndromes with bone marrow fibrosis: a myelodysplastic disorder with proliferative features. Ann Hematol. 63:235–41. DOI: 10.1007/BF01698371. PMID: 1958747.
pmid
11. Norén-Nyström U, Roos G, Bergh A, et al. 2008; Bone marrow fibrosis in childhood acute lymphoblastic leukemia correlates to biological factors, treatment response and outcome. Leukemia. 22:504–10. DOI: 10.1038/sj.leu.2405072. PMID: 18094715.
pmid
12. Yokoyama K, Amamiya T, Kawai Y, et al. 1997; Acute lymphocytic leukemia associated with severe myelofibrosis. Keio J Med. 46:196–204. PMID: 9444932.
pmid
13. Ray R, Garewal G, Marwaha RK, Marwaha N. 1993; Childhood myelofibrosis: transformation to acute lymphoblastic leukemia. Pediatr Hematol Oncol. 10:175–8. DOI: 10.3109/08880019309016553. PMID: 8093117.
pmid
14. Nordan UZ, Humbert JR. 1979; Myelofibrosis and acute lymphoblastic leukemia in a child with Down syndrome. J Pediatr. 94:253–5. DOI: 10.1016/S0022-3476(79)80837-9. PMID: 153954.
pmid
15. Marino R, Altshuler G, Humphrey GB. 1979; Idiopathic myelofibrosis followed by acute lymphoblastic leukemia. Am J Dis Child. 133:1194–5. DOI: 10.1001/archpedi.1979.02130110102022. PMID: 292303.
pmid
16. Eliacik E, Isik A, Aydin C, et al. 2015; Bone marrow fibrosis may be an effective independent predictor of the 'TKI drug response level' in chronic myeloid leukemia. Hematology. 20:392–6. DOI: 10.1179/1607845414Y.0000000221. PMID: 25517484.
pmid

Fig. 1
Bone marrow biopsy. (A) Extensive fibrosis (WHO grade: 2) with interspersed atypical cells (hematoxylin and eosin, ×10). (B) Reticulin fibrosis (silver stain, ×10).
br-56-1-46-f1.tif
Fig. 2
Flow cytometry plots. (A) Precursor B-ALL. Blasts were positive for CD34, CD117, CD38, C20, CD19, CD79a, CD10, and cytoplasmic CD22. Blasts were negative for HLADR, cytoplasmic CD3, CD7, CD5, CD1a, CD2, CD3, CD4, CD8, CD13, CD33, MPO, CD64, and CD10. (B) Early T-precursor ALL. Blasts were positive for CD34, CD117, HLADR, cCD3, CD38, CD123, CD99, and CD7. Blast were negative for CD5, CD1a, CD2, CD3, CD4, CD8, CD13, CD33, MPO, CD64, CD20, CD19, CD79a, and CD56.
br-56-1-46-f2.tif
Table 1
Clinical and pathological review of seven cases of acute myelofibrosis with acute lymphoblastic leukemia reported in the literature.
S. No Author, year Age/sex HSM, LN Initial PB findings BMA findings ALL subtype BM biopsy findings Cytogenetic findings MF at repeat BM Outcome
1 Amjad et al. [2], 1979a,b) 57 yr/F Absent Anaemia Dry tap NA MF Normal NA Death
2 Chen et al. [3], 1992a) 4 yr/M NA NA NA NA NA NA NA NA
3 Dunphy et al. [4], 1996a) 44 yr/M Absent Pancytopenia Dry tap Pre-B MF, pleomorphic and dysplastic megs Deletion 5p Present(EOM) Alive
4 Abla et al.[5], 2006 15 yr/F Absent Bicytopenia,7% blasts Diluted 9–58% blasts Pre-B MF (reticulin and collagen), blasts Normal NA Alive
5 Avci et al. [6], 2008 4.5 yr/M Absent Bicytopenia, 3% blasts Dry tap Pre-B MF Extra signal of chr.21q22 Absent (day-70) Alive
CD20+
6 Gonzalez et al. [7], 2013c) 72 yr/M NA Pancytopenia Dry tap Pre-B MF, clustering and dysplasia of megs, reduced megs NA NA Relapse, Alive
CD20+
7 Friesenbichler et al. [8], 2018 13 yr/F Absent Pancytopenia Hypocellular Pre-B MF, megs hyperplasia and dysplasia, 15% blasts Normal Absent (day-33) Alive
Hyperplastic and dysplastic megs, no blasts

a)Acute myelofibrosis preceded the diagnosis of ALL. b)Patient presented with recurrent anaemia. Initial PB examination did not show blasts. Subsequently, blasts were observed in PB. c)Patient was a treated case of multiple myeloma.

Abbreviations: ALL, acute lymphoblastic leukemia; BM, bone marrow; BMA, bone marrow aspiration; EOM, end of maintenance; F, female; HSM, hepatosplenomegaly; LN, lymphadenopathy; M, male; Megs, megakaryocytes; MF, myelofibrosis; NA, not available; PB, peripheral blood.

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