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Erschienen in: Journal of Translational Medicine 1/2017

Open Access 01.12.2017 | Research

PIM-1 mRNA expression is a potential prognostic biomarker in acute myeloid leukemia

verfasst von: Hui Cheng, Chongmei Huang, Xiaoqian Xu, Xiaoxia Hu, Shenglan Gong, Gusheng Tang, Xianmin Song, Weiping Zhang, Jianmin Wang, Li Chen, Jianmin Yang

Erschienen in: Journal of Translational Medicine | Ausgabe 1/2017

Abstract

Background

High expression of proviral integration site for Moloney murine leukemia virus-1 (PIM-1), a serine/threonine kinase, is associated with many cancers. The main purpose of this study were to investigate that the correlation between PIM-1 mRNA levels and clinicopathologic features and its clinical significance in acute myeloid leukemia (AML).

Methods

qRT-PCR was performed for 118 de novo AML and 20 AML complete remission patients and 15 normal individuals. All statistical analysis were performed using Graphpad Prism5 software.

Results

We observed that expression of PIM-1 mRNA was higher in AML patients than in healthy individuals and in complete remission AML patients (P = 0.0177). Further, high PIM-1 mRNA levels were more associated with high-risk FLT3+ AML patients than the FLT3− group (P = 0.0001) and were also associated with clinical factors such as risk stratification (P = 0.0029) and vital status (P = 0.0322). Kaplan–Meier survival analysis indicated that PIM-1 mRNA expression correlated with overall survival (OS), disease free survival (DFS), and relapse rate (RR) in AML patients. Most importantly, the high PIM-1-expressing patients took longer to achieve complete remission than the low expression group (P = 0.001). In addition, the complete remission rate was significantly lower in the high PIM-1 group (P = 0.0277) after induction therapy.

Conclusions

Above results suggest that PIM-1 mRNA levels may be an independent prognostic factor in AML.
Hinweise

Electronic supplementary material

The online version of this article (doi:10.​1186/​s12967-017-1287-4) contains supplementary material, which is available to authorized users.
Hui Cheng and Chongmei Huang contributed equally to this work
Abkürzungen
PIM-1
proviral integration site for Moloney murine leukemia virus-1
AML
acute myeloid leukemia
qRT-PCR
real time quantitative polymerase chain reaction
FLT3
fms-like tyrosine kinase
CR
complete remission
OS
overall survival
DFS
disease free survival
RR
relapse rate
CN-AML
cytogenetically normal acute myeloid leukemia
ROC
receiver operating characteristic
EFS
event-free survival

Background

The PIM-1 gene is a proto-oncogene located on chromosome 6p21 that encodes a serine/threonine kinase, found mostly in hematopoietic cells as a member of the PIM family [1]. It was originally identified as a proviral integration site for Moloney murine leukemia virus-1 [2]. PIM belongs to a family with three closely related members (PIM-1, PIM-2, and PIM-3), which are constitutively active serine/threonine kinases that promote cell survival, proliferation and migration in several malignancies including cancers [35]. PIM-1 tightly regulates its own expression and function [6, 7], and also regulates critical signaling pathways like JAK/STAT [3] and PI3 K/AKT [8]. The PIM-1 gene encodes two isoforms, PIM-1L and PIM-1S, as a result of translation initiation at two different sites [2]. PIM-1L is the longer isoform with a molecular mass of 44 kDa and mainly localizes to plasma membrane; PIM-1S is the shorter isoform with a molecular mass of 33 kDa, which predominately localizes into nucleus and cytosol. These 2 isoforms have distinct functions in various malignancies [9]. Moreover, PIM-1 is also upregulated in advanced prostate cancer and esophageal squamous cell carcinoma [10, 11].
Acute myeloid leukemia (AML) is a biologically complex and clinically heterogeneous disease that accounts for nearly 80% of adult acute leukemia cases with increased incidence with age [12]. A number of cytogenetic and molecular aberrations have been identified and form the basis of classification and risk stratification of AML [13]. In 97% of AML cases, genetic mutations have been identified, often presented as cytogenetically normal (CN-AML) AML [14, 15]. Cytogenetics and mutation testing are the most important prognostic tools for AML treatment after induction therapy [16]. Although there is rapid improvement in risk stratification of AML gene mutations and development of many new drugs such as monoclonal anti-CD33 antibody, inhibitor of mutant IDH1 and IDH2 and inhibitor of DOT1L, majority of patients still experience relapse and succumb to the disease [1720]. The 5-year survival rate stands at 26% after AML diagnosis, and the extremely poor survival rate indicates the aggressive nature of this malignant disease [21]. Recently, studies focused on the mechanism of PIM-1 transcription and AML [22, 23]. Until now, little data is known regarding the impact of PIM-1 mRNA overexpression on prognosis in AML patients.
In this retrospective study, we examined the expression of PIM-1 at the mRNA level and explored the relationship of PIM-1 expression with clinicopathologic parameters, including overall survival. We found that the expression of PIM-1 was associated with poor prognosis of AML patients.

Methods

Patients and clinical samples

The study was approved by the Medical Ethical Committee of First Affiliated Hospital of Second Military Medical University, China. All 118 patients received induction therapy with either typically “7 + 3” or a similar regimen with daunorubicin and cytarabine-based induction and consolidation therapies. The “7 + 3” regiment consisted of the following agents: idarubicin (8–12 mg/m2/day × 3 days) or daunorubicin (45–90 mg/m2/day × 3 days), cytarabine (100–200 mg/m2/day × 7 days). Leukemia cell samples were obtained from 118 new diagnosis patients between January 2010 and December 2014 from the Department of Hematology, First Affiliated Hospital of Second Military Medical University, China. All patients gave their informed consent for this study. The patient samples were selected in this study only if follow up was obtained and all clinical data were available. Meanwhile, bone marrow samples from complete remission AML patients (n = 20) and normal individuals without any blood diseases (n = 15) were also obtained for this study. Mononuclear cell isolation was performed using Lymphoprep (Hao-Yang Biological Manufacture Co., Ltd., TianJin, China).

RNA extraction and qRT-PCR

Total RNA was extracted from bone marrow mononuclear cells isolated from AML and complete remission AML patients and normal individuals as controls using Trizol (Invitrogen; Carlsbad, CA, USA) according to the manufacturer’s instructions. The RNA was quantified and dissolved with DEPC water. 1ìg RNA was converted to cDNA using a cDNA synthesis kit (Takara Bio, Inc., Tokyo, Japan). The content of kit includes PrimeScript RTase, RNase Inhibitor, Random 6 mers, Oligo dT Primer, dNTP Mixture and Buffer, and reaction conditions were as follows: incubation for 15 min at 37 °C, inactivation 5 s at 85 °C. qRT-PCR was performed in the ABI 7500 amplification system (Applied Biosystems, Foster City, CA, USA) using the cDNA samples. Glyceraldehyde 3-phosphate dehydrogenase (GAPDH) was used as an internal control. The quantitative PCR primers were as follows: PIM-1 forward, 5′-GCAAATAGCAGCCTTTCTGG-3′ and reverse 5′-CCTAGGACCCCTGGAGAGTC-3′; GAPDH forward, 5′-CTCCTGTTCGACAGTCAGCC-3′ and reverse 5′-TTCCCGTTCTCAGCCTTGAC-3′. The SYBR Premix Ex Taq II kit (Takara Bio, Inc., Tokyo, Japan) was used for real-time qPCR. The PCR conditions were as follows: 40 cycles of pre-incubation for 30 s at 95 °C, denaturation for 5 s at 95 °C and annealing for 34 s at 60 °C. The amplification plots were shown in Additional file 1: Figure S1. The 2−△Ct method was used to quantify the relative PIM-1 mRNA levels normalized to GAPDH mRNA. Calculated results were shown by 2−△Ct (%).

Patient classification and risk stratification

AML patients were classified as favorable, intermediate or adverse groups according to 2012 European LeukemiaNet clinical practice guidelines based on chromosomal fusion and gene mutations (Table 1) [13].
Table 1
2012 European LeukemiaNet prognostic-risk group based on cytogenetic and molecular profile
Prognostic-risk group
Cytogenetic profile alone
Cytogenetic profile and molecular abnormalities
Favorable
t(8:21)(q22; q22)
inv(16)(p13; 1q22)
t(15;17)(q22; q12)
t(8:21)(q22; q22) with no c-KIT mutation
inv(16)(p13; 1q22)
t(15;17)(q22; q12)
Mutated NPM1 without FLT3-ITD (CN-AML)
Mutated biallelic CEBPA (CN-AML)
Intermediate
CN-AML
t(9;11)(p22; q23)
Cytogenetic abnormalities not included in the favorable or adverse prognostic risk groups
t(8:21)(q22;q22) with mutated c-KIT
CN-AML other than those included in the favorable or adverse prognostic group
t(9;11)(p22; q23)
Cytogenetic abnormalities not included in the favorable or adverse prognostic risk groups
Adverse
inv(3)(q21q26.2)
t(6;9)(p23; q34)
11q abnormalities other than t(9;11)
−5 or del(5q)
−7
Complex karyotype
TP53 mutation, regardless of cytogenetic profile
CN with FLT3-ITD
CN with DNMT3A
CN with KMT2A-PTD
inv(3)(q21q26.2)
t(6;9)(p23;q34)
11q abnormalities other than t(9;11)
−5 or del(5q)
−7
Complex karyotype
CN-AML normal cytogenetics acute myeloid leukemia, ITD internal tandem duplications

Follow-up

Clinical and laboratory examinations were used for the follow-up of AML patients, including cell morphology, immunology, cytogenetics and molecular biology. Overall survival was defined as the time from the date of treatment to the date of death or the last follow-up examination. In the current study, out of the 118 patients, 88 patients died during the follow-up period.

Statistical analysis

Event-free survival (EFS) was defined as the time from the date of diagnosis to removal from the study due to relapse, disease progression or death. Disease-free survival (DFS) refers to the time from randomization to relapse or death due to disease progression. Overall survival (OS) is the time from randomization to death for any cause. Time to complete remission refers to the time from the date of diagnosis to acquisition morphological less than 5% of the leukemia burden by chemotherapy.
All statistical analysis was performed using Graphpad Prism5 software. The Student’s t test and one way ANOVA were used to analyze the correlation between PIM-1 mRNA expression and the clinicopathological features in AML patients. Complete remission rate was analyzed by Chi square test. Kaplan–Meier plots were generated for patient survival and analyzed using the Mantel–Cox log-rank test. P value <0.05 was considered statistically significant.

Results

Clinical characteristics of patients with AML

In present study, we evaluated 118 de novo AML patients, 35 AML complete remission patients and normal individuals as controls. The 118 patients with AML included 62 males and 56 females with a median age of 47 years (range 14–72 years). We used the 2012 European LeukemiaNet clinical practice guidelines to classify the patients into 49 favorable, 28 intermediate and 41 adverse cases. Allogenic hematopoietic stem cell transplantation had been performed on 31 patients and 87 patients had received chemotherapy alone. The median follow-up time of surviving patients was 12 months (range 0.2–77 months). The clinicopathologic characteristics of the patients are listed in Table 2.
Table 2
Correlation between PIM-1 expression and clinicopathological features in patients with acute myeloid leukemia (AML)
Clinicopathological feature
Total
mRNA expression of PIM-1
P value
Low (n = 38, 32.2%)
High (n = 80, 67.8%)
Gender
 Male
62
17 (27.5%)
45 (72.5%)
0.1522
 Female
56
21 (37.5%)
35 (62.5%)
Age (years)
 ≤47
67
21 (31.3%)
46 (68.7%)
0.3469
 >47
51
17 (33.3%)
34 (66.7%)
WBC (×109)
 <10
57
16 (28.1%)
41 (71.9%)
0.9206
 >10
61
22 (36.1%)
39 (63.9%)
Hb (g/L)
 <81
66
18 (27.3%)
48 (72.7%)
0.7689
 >81
52
20 (38.5%)
32 (61.5%)
PLT (×109)
 <57
75
28 (37.3%)
47 (62.7%)
0.7321
 >57
43
10 (23.3%)
33 (76.7%)
Blasts (%)
 <62
54
14 (25.9%)
40 (74.1%)
0.1762
 >62
64
24 (37.5%)
40 (62.5%)
FAB classification
 M1
4
1 (25%)
3 (75%)
0.1162
 M2
35
15 (42.9%)
20 (57.1%)
 M4
37
11 (29.7%)
26 (70.3%)
 M5
37
9 (24.3%)
28 (75.7%)
 M6
5
2 (40%)
3 (60%)
Risk stratification
 Low risk
49
24 (48.9%)
25 (51.1%)
0.0029a
 Intermediate risk
28
9 (32.1%)
19 (67.2%)
 High risk
41
5 (12.2%)
36 (87.8%)
Treatment
 Chemotherapy
87
26 (29.9%)
61 (70.1%)
0.9098
 HSCT
31
12 (38.7%)
19 (61.3%)
Vital status
 Survival
27
14 (51.9%)
13 (48.1%)
0.0322a
 Death
91
24 (26.4%)
67 (73.6%)
HSCT hematopoietic stem cell transplant
aStatistically significant

Relationship between PIM-1 mRNA and clinical features in AML patients

We first analyzed PIM-1 mRNA expression in samples from 118 de novo AML and 20 AML complete remission patients and 15 normal individuals by qRT-PCR. The results indicated that PIM-1 mRNA was significantly increased 4–5 folds in 118 AML patients compared to AML complete remission and normal control individuals, respectively (P = 0.0177, Fig. 1a).
We further analyzed the association between PIM-1 mRNA levels and various clinicopathologic features including gender, age, white blood cell counts, hemoglobin content, platelet counts,  % blasts, FLT3 status, FAB classification risk stratification, treatment and vital status by Student’s t test and one-way ANOVA. As shown in Fig. 1b–d, PIM-1 mRNA levels were significantly correlated with risk stratification (P = 0.0029), FLT3 (− or +; P = 0.0001) and vital status (P = 0.0322). As shown in Table 2, no significant correlation was found between PIM-1 mRNA levels and clinical features such as gender, age, white blood cells, hemoglobin, platelet, blasts (%), FAB classification and treatment.

High PIM-1 mRNA levels predicts poor prognosis for AML patients

We further evaluated if PIM-1 mRNA was a prognostic indicator in AML patients by analyzing PIM-1 expression levels with the clinical follow-up information based on Kaplan–Meier analysis and log-rank test. Based on ROC curve, PIM-1 expression level at the value of 0.5424 (%) was selected as the cut-off value to define lower- and higher-expression groups. As shown in Fig. 2, AML patients with higher PIM-1 expression had significant correlation with DFS (P = 0.0158), RR (P = 0.0219) and OS (P = 0.0015) compared to those with lower PIM-1 expression and no significant difference in EFS (Additional file 2: Table S1). Further, we observed that the high PIM-1 expression group needed significantly longer time for complete remission than the low PIM-1 expression group (P = 0.001, Fig. 3a). Also, the complete remission rate was significantly lower in high PIM-1 group (71.25%) than the low expression group (89.47%) after induction therapy (P = 0.0277; Fig. 3b). The OS of high PIM-1 expression group was significantly lower compared to that of the low PIM-1 expression group in the FLT3+ and FLT3− categories (Fig. 4). The OS of low PIM-1 expression group is better than that of high expression group in the high risk AML patients (Fig. 5). These results indicated that high PIM-1 expression suggested poor prognosis in AML.

Discussion

AML is a heterogeneous disease that is characterized by clonal expansion of undifferentiated myeloid precursors, which ultimately results in impaired hematopoiesis and bone marrow failure [24]. Although 60–80% of patients with de novo AML achieve complete remission with induction therapy, significant number of cases undergo relapse that accounts for the poor overall long-term survival rate [16, 25]. Hence, accurate assessment of prognosis is central to the physician deciding between standard or elevated treatment intensity; consolidation chemotherapy or allogenic hematopoietic stem cell transplant; established or investigational therapy [26, 27]. Therefore we investigated if PIM-1 mRNA expression levels can be prognostic in AML by evaluating its association with various clinical and prognosis parameters in AML patients.
Previous studies have indicated that PIM-1 kinase has a critical role in tumorigenesis [1, 10, 28]. It is an important anti-tumor therapeutic target because it interacts with various proteins and regulates many critical signaling pathways [9]. Oncogenic FLT3-ITD was shown to aberrantly activate STAT5 that promoted expression of PIM-1 kinase [29]. The PIM-1 kinase is an integral part of FLT3 signaling pathway and phosphorylates many pro-apoptotic proteins; in some cases it may act upstream of FLT3 [22, 30]. Recent studies have demonstrated that PIM-1 transcription is regulated by IL-6 and FOXP3, which suggests that PIM-1 can be a potential target for immunotherapy [31, 32]. Also, there is evidence that PIM-1 mediates drug resistance through its interaction with FLT3 [23, 33]. This suggests that PIM-1 is part of a complex network that regulates tumor progression in AML and elevated PIM-1 expression maybe of prognostic significance to AML patients. Besides, Goldberg et al. studied that PIM-1 and the RAS pathway are potential therapeutic targets of high-risk leukemia [34]. In addition, ETS2, a downstream effector of the RAS/RAF/ERK pathway, the same as PIM-1, which plays a crucial role in cell growth and Fu et al. also reported that high expression of ETS2 predicted poor prognosis in acute myeloid leukemia [35, 36]. This illustrates that our finding may be relevant to these studies.
Our data was consistent with previous findings [23], which shown that PIM-1 was highly expressed in AML patients with FLT3+ compared with FLT3− patients (76.47% vs 45.54%, P = 0.0183; Additional file 1: Figure S1). Furthermore, PIM-1 mRNA was significantly higher in AML patients compared to both the complete remission patients and normal control group (Fig. 1a). The current study demonstrated that PIM-1 high expression indicates poor prognosis in FLT3+ and FLT3− AML patients (Fig. 4) and PIM-1 expression was higher in FLT3+ AML patients than FLT3− (Fig. 1d). Also, it significantly correlated with clinical factors like efficacy and risk stratification suggesting its potential as an independent biomarker. Kaplan–Meier analysis revealed that the AML patients with low PIM-1 expression had significantly prolonged overall survival compared with high PIM-1 expressing patients. Consistent with the findings in solid tumor, PIM-1 mRNA expression is also up-regulated during malignant transformation in prostate cancer and esophageal squamous cell carcinoma [11, 37].

Conclusions

Our data indicated that PIM-1 mRNA expression levels are significantly correlated with prognosis, and might be an independent prognostic factor in AML. Simultaneously, the results also might provide a novel biomarker that can be used to diagnose and monitor minimal residual disease in AML.

Authors’ contributions

LC designed the research; HC detected samples and analyzed data; CH wrote the manuscript; JY critically reviewed the manuscript and was a mentor; XX, XH, SG, GT, XS, WZ and JW diagnosed and treated the patients. All authors read and approved the final manuscript.

Acknowledgements

The authors thank supports from other colleagues who have contributed to this research in Institute of Hematology, Changhai hospital, Shanghai.

Competing interests

The authors declare that they have no competing interests.

Availability of data and materials

All datasets generated and analyzed during the current study are available from the corresponding author upon reasonable request.
Not applicable.
All patients gave their informed consent for this study. The study was approved by the Medical Ethical Committee of First Affiliated Hospital of Second Military Medical University, China.

Funding

This study was supported by the National Natural Science Foundation of China (Grant Nos. 81400133, 30973495) and the Shanghai Science and Technology Committee (15ZR1412600 to L.C).

Publisher’s Note

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Metadaten
Titel
PIM-1 mRNA expression is a potential prognostic biomarker in acute myeloid leukemia
verfasst von
Hui Cheng
Chongmei Huang
Xiaoqian Xu
Xiaoxia Hu
Shenglan Gong
Gusheng Tang
Xianmin Song
Weiping Zhang
Jianmin Wang
Li Chen
Jianmin Yang
Publikationsdatum
01.12.2017
Verlag
BioMed Central
Erschienen in
Journal of Translational Medicine / Ausgabe 1/2017
Elektronische ISSN: 1479-5876
DOI
https://doi.org/10.1186/s12967-017-1287-4

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