CC BY-NC-ND 4.0 · South Asian J Cancer 2022; 11(01): 062-067
DOI: 10.1055/s-0041-1731599
Original Article
Leukemia – Lymphoma and Myeloma

Hematopoietic Stem Cell Transplant for Hematological Malignancies: Experience from a Tertiary Care Center in Northern India and Review of Indian Data

Sanjeev Kumar Sharma
1   Center for Bone Marrow Transplant, BLK Super Speciality Hospital, New Delhi, India
,
Dharma Choudhary
1   Center for Bone Marrow Transplant, BLK Super Speciality Hospital, New Delhi, India
,
Divya Doval
1   Center for Bone Marrow Transplant, BLK Super Speciality Hospital, New Delhi, India
,
Vipin Khandelwal
1   Center for Bone Marrow Transplant, BLK Super Speciality Hospital, New Delhi, India
,
1   Center for Bone Marrow Transplant, BLK Super Speciality Hospital, New Delhi, India
,
Tina Dadu
1   Center for Bone Marrow Transplant, BLK Super Speciality Hospital, New Delhi, India
,
Anil Handoo
1   Center for Bone Marrow Transplant, BLK Super Speciality Hospital, New Delhi, India
› Author Affiliations
Funding None.
 

Abstract

Zoom Image
Sanjeev Kumar Sharma

Hematopoietic stem cell transplantation (HSCT) is the preferred treatment for high-risk and relapsed/refractory hematological malignancies. Moreover, with the improved supportive care and increasing acceptance of haploidentical transplantations as an alternative treatment modality, more patients are opting for HSCT as a definite treatment for hematological malignancies. We report here the real-world data and outcome of HSCT done for hematological malignancies at our transplant center. Five hundred and sixteen patients underwent HSCT from August 2010 to November 2019. The most common indications for allogeneic and autologous HSCT were acute myeloid leukemia and multiple myeloma, respectively. The 5-year overall survival and disease-free survival for all transplants were 65% and 33%, respectively. Though outcome of matched sibling donor allogeneic transplant is better than haploidentical donor (HID) transplant, patients having only HID can still be considered for allogeneic HSCT for high-risk diseases. The most common cause of death was infections followed by relapse of the disease.


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Introduction

Hematopoietic stem cell transplantation (HSCT) is the preferred treatment for high-risk and relapsed/refractory (RR) hematological malignancies. Acute myeloid leukemia (AML) and multiple myeloma (MM) are the most common hematological malignancies requiring HSCT. There is scarcity of data on the feasibility and the outcome of autologous and allogeneic stem cell transplant from the developing countries. We report here the real-world data on the outcome of HSCT done at our transplant center.


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Materials and Methods

Five hundred and sixteen patients who underwent HSCT at BLK Super Speciality Hospital, New Delhi, India, from August 2010 to November 2019, were evaluated retrospectively using hospital information system and medical records. Informed consent was taken from all patients, and the study was approved by hospital ethical committee and institutional review board. The transplants were conducted in high-efficiency particulate air-filtered rooms. All patients received conditioning regimens as per transplant protocols and transplant physician's discretion depending upon the type of disease and patient's performance status.

Conditioning intensity was defined as per the Consensus Center for International Blood and Marrow Transplant Research criteria.[1] Myeloablative conditioning (MAC) regimens were defined by busulfan (Bu) dose > 6.4 mg/kg intravenously, whereas reduced intensity conditioning (RIC) regimens were defined by Bu dose ≤ 6.4 mg/kg intravenously and melphalan (Mel) ≤ 150 mg/m2 intravenously. The various RIC conditioning regimens used were fludarabine (Flu)/Mel (Flu 30 mg/m2 intravenously for 5 days and Mel 140 mg/m2 intravenously for 1 day), Flu/Bu (Flu 30 mg/m2 intravenously for 5 days and Bu 3.2 mg/kg/day intravenously for 2 days), Flu/Ara-C/idarubicin/Mel (Flu 30 mg/m2 intravenously for 5 days, cytarabine 2 g/m2 intravenously for 5 days, idarubicin 8 mg/m2 intravenously for 3 days, and Mel 140 mg/m2 intravenously for 1 day), and Flu/cyclophosphamide (Cy) (Flu 30 mg/m2 intravenously for 5 days and Cy 60 mg/kg intravenously for 2 days). MAC regimen included Bu/Cy (Bu 3.2 mg/kg/day intravenously for 4 days and Cy 60 mg/kg intravenously for 2 days), Cy/total body irradiation (TBI) (Cy 50 mg/kg intravenously for 3 days and TBI 200 cGy twice daily for 3 days), and Flu/Bu4 (Flu 40 mg/m2 intravenously for 4 days and Bu 3.2 mg/m2 intravenously once daily for 4 days).

The non-myeloablative haploidentical donor (HID) transplant protocol consisted of Flu/Cy/TBI (Cy 14.5 mg/kg/day intravenously for 2 days, Flu 30 mg/m2/day intravenously on days 5 days, and TBI 200 cGy on day –1), whereas the myeloablative HID transplant protocol consisted of Flu/Bu/Cy (Flu 25 mg/m2 intravenously for 5 days, Bu 110 mg/m2 intravenously for 4 days, and Cy 14.5 mg/kg for 2 days). Donor-specific antibodies were done using single bead assay for all patients undergoing HID transplants.

For autologous HSCT, MM patients received Mel 200 mg/m2 (11 patients received Mel 140 mg/m2) and lymphoma patients received BEAM (BCNU 300 mg/m2 on day –6; etoposide 200 mg/m2 on days –5 to –2 [total dose 800 mg/m2], cytarabine 200 mg/m2 twice daily on days –5 to –2 [total dose 1600 mg/m2], and Mel 140 mg/m2 on day –1) as conditioning regimens before transplant. Stem cells were infused on day 0. For myeloma patients peripheral blood hematopoietic stem cells (PBSCs) were noncryopreserved and for lymphoma patients PBSCs were cryopreserved.

PBSC harvest was done in blood bank and bone marrow harvest was done in the operation theater under general anesthesia. Posttransplant graft versus host disease (GVHD) prophylaxis included methotrexate, cyclosporine, or posttransplant cyclophosphamide (50 mg/kg on day +3 and day +4 posttransplant), tacrolimus, and mycophenolate mofetil as per protocol. All patients received antimicrobial prophylaxis including fluconazole (200 mg once a day orally), acyclovir (400 mg twice a day orally), and co-trimoxazole, and treatment of febrile neutropenia as per hospital policy. Engraftment was defined by absolute neutrophil count more than 500/μL for three consecutive days and platelet counts more than 20,000/μL for 7 days after last platelet transfusion. GVHD was graded as per Glucksberg criteria and was treated with intravenous methylprednisolone accordingly. After discharge the patients were regularly followed up in outpatient clinics.


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Statistical Analysis

Survival analysis was done using Kaplan–Meier curve analysis using MedCalc version 2.0. Multivariate analysis was performed using Cox proportional regression analysis and log rank test for patients undergoing autologous and allogeneic transplants. Statistical calculation for comparison between matched sibling donor (MSD) and HID HSCT was done using chi-square test or Student's t-test as required.


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Results

Out of the 516 patients, who underwent HSCT for hematological malignancies, 348 were males and 168 were females. Median age was 43 years (range: 2–75 years) ([Table 1]). Two hundred fifty-eight (50%) patients underwent autologous HSCT. Among allogeneic HSCT, 181 were MSD HSCT, 64 were HID HSCT, and 13 were matched unrelated donor (MUD) HSCT. The most common indication for allogeneic HSCT was AML (32.4%) and the most common indication for autologous HSCT was MM (35.8%). The most common RIC regimen used was Flu/Mel, and the most common MAC regimen used was Bu/Cy ([Table 1]). Grade 1 acute GVHD and grade 2 to 4 acute GVHD developed, respectively, in 4.3 and 26.8% patients undergoing allogeneic HSCT. All patients with grade 2 to 4 GVHD were treated with intravenous methylprednisolone 1 mg/kg twice a day as first line treatment. Second line treatment included etanercept (0.4 mg/kg twice a week), ruxolitinib (5–10 mg twice a day), or methotrexate. About 11% patients responded to steroids whereas 36.1% patient required two or more lines of treatment. Chronic GVHD was seen in 16.3% patients. Cytomegalovirus (CMV) reactivation was seen in 31.2% of patients and the patients were treated with intravenous ganciclovir (5 mg/kg twice daily) followed by oral valganciclovir. The 5-year overall survival (OS) and disease-free survival (DFS) for all HSCTs were 65 and 33%, respectively. [Table 2] and [Figs. 1] and [2] show the disease-specific 5-year OS and DFS. Among allogeneic HSCT patients, the 5-year OS was significantly better in the MSD group compared with the HID group (53.6% vs. 21.7%, p < 0.001), though the 5-year DFS was not significantly different between the two groups (42% vs. 35.7%, p = 0.247). The overall mortality was 30.8%. The most common cause of death was infection followed by relapse of the disease. Seven patients developed proven or probable fungal pneumonia based on bronchoalveolar lavage or chest computed tomography scan findings. Five patients developed posterior reversible encephalopathy syndrome and there was no death due to bleeding. Gram-negative bacterial infection was seen in 18.4% of patients and the most common bacteria grown were Escherichia coli, Pseudomonas aeruginosa, Klebsiella, and Enterococcus. Day +100 transplant-related mortality (TRM) of the total cohort was 16.6%.

Table 1

Characteristics of patients undergoing HSCT for hematological malignancies

Total (n) = 516

Conditioning regimens

Males

348 (67.4%)

Bu+Cy

51

Females

168 (32.6%)

Cy+TBI

32

Median age

43 y (range: 2–75 y)

Flu+Mel

87

Disease type

Flu+Cy+TBI (Haplo)

43

Plasma cell dyscrasia (PCD)

185 (35.8%)

Flu+Ara C+ Ida + Mel (sequential)

8

Lymphoproliferative disorder (LPD)

95 (18.4%)

Flu+Ida +Mel

13

Acute myeloid leukemia (AML)

167 (32.4%)

Flu+Bu+Cy

20

Acute myeloid leukemia (AML)

69 (13.4%)

Flu+Bu+Thymo

8

Transplantation

Mel

183 (Mel 200-160/Mel 140 -11)

Autologous

258

BEAM

69

MSD allogeneic

181

Thio-Treo-Flu

1

HID allogeneic

64

Tubingen

1

MUD allogeneic

13

ECOG performance status

Viral status

0

23

HBsAg reactive

13

1

467

HCV reactive

8

2

22

HIV positive

1

3

4

Abbreviations: Ara-C, cytarabine; BEAM, BCNU/etoposide/cytarabine/melphalan; Bu, busulfan; Cy, cyclophosphamide; ECOG, Eastern Cooperative Oncology Group; Flu, fludarabine; HCV, hepatitis C virus; HID, haploidentical donor; HIV, human immunodeficiency virus; HSCT, hematopoietic stem cell transplantation; Ida, idarubicin; MSD, matched sibling donor; MUD, matched unrelated donor; TBI, total body irradiation; Thio, thiotepa; Thymo, thymoglobulin; Treo, treosulfan.


Note: LPD includes Hodgkin and non-Hodgkin lymphoma.


Table 2

The OS and DFS for all HSCT patients with hematological malignancies

Diseases

Mean OS (mo)

5-year OS

Mean DFS (mo)

5-year DFS

ALL

44.49 (SE 4.69), 95% CI 35.28–53.68

48.7%

41.91 (SE 3.85), 95% CI 39.36–54.47

33.2%

AML

67.48 (SE 5.95), 95% CI 55.80–79.15

47.0%

52.76 (SE 3.73), 95% CI 45.43–60.09

41.8%

Hodgkin lymphoma

76.42 (SE 5.01), 95% CI 66.59–86.25

83.0%

44.36 (SE 4.39), 95% CI 35.75–52.97

29.5%

Non-Hodgkin lymphoma

59.90 (SE 5.86), 95% CI 48.41–71.39

65.0%

49.32 (SE 4.31), 95% CI 40.88–57.75

38.0%

Multiple myeloma

88.94 (SE 3.70), 95% CI 81.67–96.21

82.3%

44.14 (SE 2.21), 95% CI 39.81–48.48

29.3%

Overall

81.74 (SE 3.60)

95% CI 84.673–98.820

65.0%

47.19 (SE 1.58)), 95% CI 44.094–50.296

33.0%

Abbreviations: ALL, acute lymphoblastic leukemia; AML, acute myeloid leukemia; CI, confidence interval; DFS, disease-free survival; HID, haploidentical donor; HSCT, hematopoietic stem cell transplantation; MSD, matched sibling donor; MUD, matched unrelated donor; OS, overall survival; SE, standard error.


Note: ALL and AML include combined OS and DFS of MSD, HID, and MUD HSCT.


Zoom Image
Fig. 1 The overall survival of all hematological malignancies.
Zoom Image
Fig. 2 The disease-free survival of hematological malignancies.

In multivariate analysis, for allogeneic HSCT, factors impacting OS were chronic GVHD (p = 0.0272), engraftment (p < 0.0001), and Eastern Cooperative Oncology Group (ECOG) status (p = 0.0302), while diagnosis, acute GVHD, donor source, graft source, mucositis, veno-occlusive disease, and CMV reactivation were not significant. For DFS, significant factors were chronic GVHD (p = 0.0064) and engraftment (p < 0.0001), while acute GVHD, ECOG status, graft source, mucositis, veno-occlusive disease, and CMV reactivation were not significant. Primary graft rejection was seen in three patients that underwent HID, two with AML and one with acute lymphoblastic leukemia (ALL).


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Discussion

India has a large population of 1.39 billion as per estimates in 2021, with increasing proportion of patients being diagnosed with hematological malignancies, requiring HSCT. In India, approximately 19,421 HSCT have been done till 2019 according to the Indian Society for Blood and Marrow Transplantation Registry (ISBMTR-2020). In 2019 alone 2,932 HSCT were performed in India and about one-third of those who underwent allogeneic HSCT were HID HSCT. With the increasing acceptance and availability of better supportive care, increasing number of patients are undergoing HSCT in developing countries, with improved outcomes and lesser cost of transplant.[2] In our cohort of patients, MM was the most common indication for autologous HSCT followed by Hodgkin lymphoma (HL), whereas AML was the most common indication for allogeneic HSCT followed by ALL. There is scarcity of multicenter data from India, with only few single-center studies available ([Table 3]).

Table 3

Studies of autologous and allogeneic HSCTs reported from India

Disease

Number of patients

Median age (y)

Survival results

Study

Multiple myeloma

94

53

6.5-years OS 76.7% and PFS 55.8%

Malhotra et al[3]

349

52

Estimated OS 40.4% at 10 years and 17.7% at 15 years

Kumar et al[4]

245

51

5-year OS 61.6% and PFS 37.2%

Kulkarni et al[5]

85

58

3-year OS 91% and PFS 58%

Gokarn et al[24]

106

52

2-year OS 83.4% and EFS 66.1%

Sharma et al[25]

141

55

5-year OS 72% and PFS 36%

Aggarwal et al[26]

50

56

1.4-year OS 86%

Naithani et al[27]

172

52

5-year OS 72% and EFS 49%

Yanamandra and Malhotra[28]

66

57

Estimated 5-year OS 82.6% and EFS 19.1%

Kumar et al[29]

Lymphoma

44

35

5-year OS 54.34% and EFS 34.3%

Kumar et al[11]

38

28

3-year OS 70.8% and DFS 66.6%

Raut et al[30]

23

39 months OS 65.7%

Shah et al[31]

Acute leukemia

254

34

5-year OS and EFS for RIC and MAC 67.2% versus 38.1% and 63.8% versus 32.3%, respectively

Ganapule et al[14]

126

37.5

3-year OS and RFS in RIC 58.5% and 53.2%, respectively, and 3-year OS and RFS in MAC 59.4% and 53.1%, respectively

Sharma et al[15]

122

29

OS 62% in MSD and 50% in HID

Nataraj et al[20]

82

54-month OS ~40%

Khattry et al[32]

46

10.7

5-year OS 36.3% and EFS 33.3% in pediatric MSD SCT

Arora et al[16]

20

12

2-year OS 64.3% in pediatric HID SCT

Jaiswal et al[21]

Abbreviations: EFS, event-free survival; HID, haploidentical donor; HSCT, hematopoietic stem cell transplantation; MAC, myeloablative conditioning; MSD, matched sibling donor; OS, overall survival; PFS, progression-free survival; RFS, relapse-free survival; RIC, reduced intensity conditioning; SCT, stem cell transplant.


Multiple Myeloma

MM is still the most common indication for autologous HSCT worldwide and in India. Various studies have been reported from the Indian subcontinent. Malhotra et al have reported the median OS of 76.7% and progression-free survival (PFS) of 55.8% at 6.5 years.[3] Kumar et al have reported an estimated OS at 10 and 15 years of 40.4 and 17.7%, respectively, and day +100 TRM of 5.2%.[4] Kulkarni et al have reported 5-year OS and PFS of 61.6 and 37.2%, respectively, and TRM of 2.86%.[5] In our cohort of myeloma patients, the 5-year OS and DFS were 82.3 and 29.3%, respectively, with mean DFS of approximately 44 months.


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Lymphoma

The age-adjusted incidence rates for non-Hodgkin lymphoma (NHL) in men and women in India have been reported at 2.9/100,000 and 1.5/100,000, respectively.[6] Approximately 50 to 60% of patients with diffuse large B cell lymphoma (DLBCL) achieve and maintain complete remission after first-line therapy, whereas 30 to 40% relapse and 10% have refractory disease.[7] High-dose therapy followed by autologous stem cell transplant (HDT-ASCT) is the mainstay of therapy for RR-DLBCL The landmark PARMA trial has established HDT-ASCT as the standard of care for RR-DLBCL.[8] In a study from India, in patients with B cell NHL treated with chemotherapy (CHOP ± R), 4-year OS and event-free survival (EFS) were 64.7 and 54%, respectively.[9] RR-NHL remains the major cause of morbidity and mortality.[10] In a study by Kumar et al, in a similar cohort of patients treated with autologous HSCT, estimated 5-year OS and EFS for patients with RR-HL and NHL were 54.34 and 34.3%, respectively, and TRM was 7%.[11] In our study, the 5-year OS and DFS for RR-HL were 83 and 29.5% and for RR-NHL were 65 and 38%, respectively, and are comparable to that reported in literature.[12] [13]


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Acute Myeloid Leukemia

Allogeneic HSCT is the preferred treatment for intermediate- and high-risk AML and for RR-AML. In a study by Ganapule et al, which included 254 consecutive patients who underwent allogeneic-HSCT for AML, the 5-year OS and EFS were 40.1 and 38.7%, respectively.[14] In the studies comparing RIC versus MAC from the Indian subcontinent, Ganapule et al has reported better OS and EFS with RIC regimen compared with MAC but this was not found in a study by Sharma et al, from similar cohort of patients.[14] [15] Among children (age ≤ 18 years) with AML who underwent allogeneic HSCT, Arora et al have reported 5-year OS and EFS of 36.3 and 33.3%, respectively.[16]

In allogeneic HSCTs, matched donor HSCTs are still preferred over HID-HSCTs; however, advances in graft techniques and pharmacological prophylaxis of GVHD have reduced the risks of graft failure and GVHD after HID-HSCT and have made haploidentical stem cell source a viable alternative for patients lacking an human leukocyte antigen-matched donor.[17] There are no published randomized comparisons of HID HSCT versus MSD HSCT. Wang et al have compared the outcomes of HID and MSD HSCT groups, the 3-year OS rates were 79 and 82% (p = 0.36), and DFS rates were 74 and 78% (p = 0.34), respectively, and the cumulative incidences of relapse were 15 and 15% (p = 0.98), and the nonrelapse mortality rates were 13 and 8% (p = 0.13), respectively.[18] In a large retrospective study by Ringdén et al, there was no statistically significant difference in probability of relapse between the MSD group when compared with the HID HSCT group but the leukemia-free survival was superior in the MSD group.[19] Nataraj et al studied MSD and HID HSCT in 122 patients, and there were 38% deaths in MSD and 50% deaths in HID HSCT (p = 0.245).[20] A study by Jaiswal et al on HID in pediatric acute leukemia have reported 2-year OS of 64.3%.[21] In our study, the outcome of HID HSCT was inferior compared with MSD HSCT. The OS in the MSD group was significantly lower in HID compared with MSD (21.7% vs. 52.6%, p < 0.001). This difference was attributed probably to increased risk of infections in the HID transplant. Sepsis was the cause of death in 22% of MSD compared with 37.5% of HID HSCT.

Though this real-world data shows variable results of HID compared with MSD transplant, HID HSCT is still a viable treatment option for high-risk patients who either lack an MSD or for those whom a MUD cannot be found or mobilized timely.[22] Better understanding of the role of T cells,[23] B cells, and antigen presenting cells in the pathophysiology of rejection, and acute and chronic GVHD, has improved the management of transplant-related complications.


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Conclusion

Autologous and allogeneic HSCTs are the curative treatment options for many high-risk and RR hematological malignancies. Though outcome of MSD allogeneic transplant is better than HID transplant, patients having only HID can still be considered for allogeneic HSCT for high-risk diseases. Infections and relapse of the disease post-HSCT are still the major obstacles in the successful outcome of HSCT.


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Conflict of Interest

None declared.

Acknowledgments

We are thankful to Dr. Anubha for compiling the data and Dr. Ravi for statistical analysis.

Financial Disclosure

The authors declare that this study received no financial support.


Ethics Committee Approval

The protocol and informed consent was approved by the Hospital ethical committee. Informed consent was taken from all the patients.


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Address for correspondence

Sanjeev Kumar Sharma, MD, DM
Center for Bone Marrow Transplant, BLK Super Speciality Hospital
New Delhi, 110005
India   

Publication History

Article published online:
15 October 2021

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  • References

  • 1 Bacigalupo A, Ballen K, Rizzo D. et al. Defining the intensity of conditioning regimens: working definitions. Biol Blood Marrow Transplant 2009; 15 (12) 1628-1633
  • 2 Sharma SK, Choudhary D, Gupta N. et al. Cost of hematopoietic stem cell transplantation in India. Mediterr J Hematol Infect Dis 2014; 6 (01) e2014046
  • 3 Malhotra P, Yanamandra U, Khadwal A. et al. Autologous stem cell transplantation for multiple myeloma: single centre experience from North India. Indian J Hematol Blood Transfus 2018; 34 (02) 261-267
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Sanjeev Kumar Sharma
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Fig. 1 The overall survival of all hematological malignancies.
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Fig. 2 The disease-free survival of hematological malignancies.