Expression of D-type cyclins in mantle cell and diffuse large B-cell lymphomas

  • Authors:
    • Lenka Zlamalikova
    • Mojmir Moulis
    • David Salek
    • Jiri Jarkovsky
    • Jan Smarda
    • Jana Smardova
  • View Affiliations

  • Published online on: March 7, 2016     https://doi.org/10.3892/or.2016.4658
  • Pages: 2673-2680
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Abstract

D-type cyclins are involved in cell cycle regulation and play an important role in the pathogenesis of lymphomas. Aberrant expression of cyclin D1 is associated with mantle cell lymphoma (MCL) and serves as a diagnostic marker of MCL. Analysis of cyclin D expression in tumor tissues of patients with diffuse large B-cell lymphoma (DLBCL) which comprises a heterogeneous group of tumors may contribute to their stratification. We analyzed expression of cyclin D1, D2, and D3 mRNAs in 30 MCL and 104 DLBCL patients using qRT-PCR and addressed their significance for disease outcome. We confirmed a high level of cyclin D1 mRNA in 29 MCL cases (97%). One case (3%) was identified as positive for cyclin D2. Expression of cyclin D1 was limited to MCL and did not occur in DLBCL. Overexpression of cyclin D2, which is rare in MCL, occurred more frequently in DLBCL (11 cases, 10.6%). We showed that high expression of cyclin D2 in DLBCL cases de novo decreased the overall survival rate (P=0.016) and progression-free survival (P=0.009). The expression pattern of cyclin D3 was similar in both types of studied lymphomas and it did not affect the disease outcome.

Introduction

The D-type cyclins, cyclin D1, D2 and D3, are positive regulators of G1 phase progression. They form a complex with the cyclin-dependent kinase Cdk4 or Cdk6 to promote cell cycle entry. Overexpression of the D-type cyclins can shorten the G1 phase and reduce the cell's dependency on mitogens. This function of D-type cyclins in cell cycle control provides them with potentially strong oncogenic power. Cyclins D1, D2 and D3 share both structural and functional similarities but they are expressed in a tissue-specific manner (1,2).

Deregulation of cyclin D1 expression is a key pathogenic event in the development of mantle cell lymphoma (MCL). MCL is a relatively rare disease representing approximately 6–8% of non-Hodgkin lymphomas (NHLs) and affecting predominantly males. The median overall survival is approximately 3–5 years. MCL is marked by chromosomal translocation t(11;14)(q13;32) leading to the juxtaposition of the CCND1 gene to the IGH gene resulting in high expression of cyclin D1. In contrast, cyclin D1 is not typically expressed in normal lymphocytes (3,4). Cyclin D1 overexpression is considered as a diagnostic marker of MCL. However, several cases of MCL with overexpression of cyclin D2 or D3 instead of cyclin D1 have been reported (5).

Diffuse large B-cell lymphoma (DLBCL) represents 30 to 40% of NHLs and comprises a heterogeneous group of tumors (6). In contrast to MCL, DLBCL cases are not associated with any specific genetic aberration. Instead, there are various genetic aberrations occurring with different frequencies that accompany this disease. They include rearrangements and mutations of BCL2, BCL6, c-MYC, CDKN2A and TP53 genes (711). Heterogeneity of the tumor is reflected in variable patient outcome. Gene expression profiling provides stratification to subgroups with different prognosis. In addition, individual biological markers with prognostic significance have been described (1214).

DLBCLs are generally considered as cyclin D1-negative. However, some DLBCL cases expressing cyclin D1 without association with t(11;14) have been recently reported. It seems though that they represent only a minority subgroup of DLBCLs (1521). Expression of cyclin D2 has been also repeatedly studied in DLBCL. The fraction of cyclin D2-positive cases varies between 13 and 62% and this feature was shown to be an independent indicator of poor survival (18,2224). Cyclin D2 overexpression is closely associated with CD5-positive cases de novo (24). The CD5-positive cases de novo represent a DLBCL subtype predominantly occurring in females and characterized by a higher age at diagnosis and a significantly poorer survival compared to CD5-negative DLBCLs (25). The frequency of cyclin D3 overexpression in DLBCL cases ranges between 20 and 41% (18,24,26) and seems to be associated with poor response to chemotherapy and shorter overall survival (26).

We previously performed detailed analysis of cyclin D1 expression in a collection of 33 tumor samples of MCL cases (27). In this study, we present a widely extended study. We analyzed the expression of cyclin D1, D2 and D3 mRNAs in patients with MCL and DLBCL using qRT-PCR and investigated the impact on disease outcome. We showed that high expression of cyclin D2 tended to decrease the overall survival rate among DLBCL patients.

Materials and methods

Tissue samples

We studied a cohort of 30 patients diagnosed with MCL in the years 2007–2012 and 104 patients diagnosed with DLBCL in the years 2001–2013 at University Hospital Brno. All patients underwent surgical biopsy of the tumor tissue and were diagnosed by a pathologist according to the WHO classification. The fresh-frozen tissue samples as well as formalin-fixed, paraffin-embedded (FFPE) tumor tissue blocks were available for all patients. A cohort of MCL patients (M1–M30) consisted of 23 men and 7 women. Median age at diagnosis was 66.5 years. Three cytomorphological subtypes were recognized: common (20 cases), blastoid (6 cases) and a pleomorphic variant (3 cases). A cohort of DLBCL patients (B1–B104) consisting of 64 men and 40 women with median age 57.0 years exhibited centroblastic (45), immunoblastic (8), mediastinal (18), anaplastic (2) and other or unspecified morphological variants (10). Based on immunohistochemical staining, the DLBCL cases were subclassified into germinal center B-cell–like (GCB) [39/104 (37.5%)] and non-GCB [65/104 (62.5%) groups according to Hans et al (28) and into subgroups 1 [62/104 (59.6%)] and 2 [42/104 (40.4%)] according to Muris et al (29). Twenty-three patients developed DLBCL as a secondary tumor. DLBCL patients were treated with either standard R-CHOP therapy (61/81 de novo cases and 19/23 secondary cases) or intensive therapy (18/81 de novo cases and 4/23 secondary cases). Two patients with de novo disease underwent no therapy. All patients were informed consent and they signed written consent allowing inclusion into this study as approved by the Ethics Committee of the University of Brno. As a control, tissues from three healthy donors and the MOLP-8 and Jurkat cell lines were used.

Cell line

The MOLP-8 cell line expressing a high level of cyclin D1 (30) was kindly provided by Dr Eva Bartova, Institute of Biophysics, Academy of Sciences (Czech Republic). The Jurkat cell line expressing a high level of cyclin D3 (31) was kindly provided by Dr Ales Hampl, Faculty of Medicine, Masaryk University (Czech Republic). MOLP-8 and Jurkat cells were cultured in RPMI-1640 medium (L-glutamine, NaHCO3; Sigma-Aldrich, Prague, Czech Republic) supplemented with 20% fetal calf serum and 1% penicillin/streptomycin in 5% CO2 at 37°C.

Immunohistochemistry

Endogenous peroxidase activity was blocked with 3% hydrogen peroxide in methanol, for 10 min. Antigen retrieval was performed in citrate buffer, pH 6.0 (Dako, Glostrup, Denmark) at 121°C for 4 min. The CD5-specific mouse monoclonal antibody (clone 4C7; Leica Biosystems, USA) diluted 1:50 was applied at 4°C overnight. The cyclin D1-specific rabbit monoclonal antibody (clone SP4; Zytovision, Germany) diluted 1:50 was applied at 4°C overnight. Reactive sites were identified using biotinylated secondary antibody, peroxidase ABC (Vector Laboratories, USA), DAB (Dako), and counterstained with Mayer's haematoxylin.

Immunoblotting

Tissue samples were lysed in solution containing 150 mM NaCl, 50 mM NaF, 50 mM Tris (pH 8.0), 5 mM EDTA, 1% NP-40 and 1 mM phenylmethylsulfonyl fluoride in ice for 30 min, and the cell extract was centrifuged at 17,000 × g for 30 min to remove cell debris. The protein concentration was determined by the Bradford assay. Solubilized proteins were resolved by 10% SDS-PAGE and transferred onto a nitrocellulose membrane. Blots were blocked in 0.1% Tween-20 and 5% low-fat milk in PBS for 1 h and probed with CD1.1 (Abcam, Cambridge, UK), Ab-4 (Thermo Fisher Scientific, Fremont, CA, USA), Ab-1 (Neomarkers, Fremont CA, USA) mouse monoclonal antibodies and actin rabbit monoclonal antibody (BD Biosciences, USA) at 4°C. Blots were developed with the Dako peroxidase-conjugated secondary antibody (Dako) using the ECL chemiluminescence detection kit (GE Healthcare UK Limited, Little Chalfont, UK).

Real-time quantitative RT-PCR

The cyclin D1, D2 and D3 transcripts were quantitated by real-time reverse transcription PCR (qRT-PCR). Total RNA was extracted from the frozen tissue samples using the Nucleospin RNA kit (Macherey-Nagel, Hoerdt, France). RNA was reverse transcribed by ProtoScript II RT (New England BioLabs, Hitchin, UK) and cDNA was amplified and quantified using TaqMan® Universal PCR Master Mix (Applied Biosystems, Foster City, CA, USA) and TaqMan Gene Expression Assays for CCND1 (Hs00765553_m1), CCND2 (Hs00153380_m1), CCND3 (Hs00236949_m1) and GAPDH in a 7500 Real-Time PCR system (Applied Biosystems). Quantitative real-time PCR was performed using these conditions: an initial cycle at 95°C for 10 min, followed by 50 biphasic cycles 95°C/15 sec and 60°C/1 min. Initial template concentration was calculated from the cycle number when the amount of PCR product passed a threshold set in the exponential phase of the PCR reaction. The threshold cycles (Ct) were recorded for the target gene and reference gene (GAPDH) in all samples. Relative gene expression was analyzed with the 2−ΔΔCT method using the GAPDH gene as the endogenous control and negative control as a calibrator. Each PCR reaction was carried out in duplicates. At least two independent analyses were performed for each sample.

Statistical analyses

Standard descriptive statistics were applied in the analysis; absolute and relative frequencies for categorical variables and median supplemented with minimum-maximum range for continuous variables. The influence of monitored parameters on survival and progression-free survival was assessed by hazard ratio estimates from univariate Cox models. Graphic visualization of patient survival according to the monitored parameters was performed using Kaplan-Meier survival curves. Statistical significance of differences in survival among groups of patients was tested using the log-rank test. α=0.05 was used as a level of statistical significance. Analyses were performed in statistical software IBM SPSS Statistics 22.0.0.1 for Windows (IBM Corporation, 2014).

Results

Quantification of cyclin D1, D2 and D3 transcripts in MCL and DLBCL

We used quantitative real-time PCR to analyze the level of cyclin D1, D2 and D3 mRNAs in all MCL and DLBCL samples, healthy specimens (negative controls) and the MOLP-8 cells (positive control). As an internal standard, GAPDH mRNA was used. The ratio of CCND1/GAPDH (CCND2/GAPDH and CCND3/GAPDH, respectively) in healthy specimens was designated as 1.0 and the normalized data of patient samples were calculated relative to this value. The cut-off level for altered cyclin D expression was set up as the mean value of CCND/GAPDH ratios determined in 3 samples from healthy donors plus 3 standard deviations (SD) and was determined as 2.8 for cyclin D1, 3.4 for cyclin D2, and 2.9 for cyclin D3. Values below these values were considered as negative. The MOLP-8 control cells featuring high expression of cyclin D1 and low expression of cyclin D2 and D3, reached a relative fold increase (RFI) of 13.0 for cyclin D1, 0.01 for cyclin D2 and 0.2 for cyclin D3 mRNAs.

The CCND1 mRNA expression of 7 MCL cases was analyzed in our previous study (27). Twenty-three new MCL patients were enrolled. We confirmed overexpression of CCND1 mRNA in 29 out of 30 cases (97%). The median relative fold increase was 27 (range 5.0–74.7). One case, M5, was previously reported as cyclin D1-negative (27 - case 25B) and analysis of the mRNA level confirmed this result (Fig. 1A). For all newly enrolled samples, the t(11;14) translocation was assessed by FISH and competitive RT-PCR was performed as previously described (27), both with affirmative results: all new cases exhibited translocation t(11;14) and expressed a high level of CCND1 mRNA (data not shown). Analysis of the CCND1 mRNA in 104 specimens from the DLBCL patients did not reveal any positivity. The relative fold increase of all samples was under the cut-off level reaching a median 0.3 (range 0.01–2.1). Fig. 2 illustrates the quantity of the CCND1 mRNA in the MCL and DLBCL cases.

The level of CCND2 mRNA scored above the cut-off level in 2 out of 30 MCL cases; in sample M5 which was earlier classified as cyclin D1-negative/cyclin D2-positive (27 - case 25B), and sample M2 with high expression of cyclin D1 (Fig. 1B). The level of the cyclin D2 protein in the samples was assessed by immunoblotting using the Ab-4 antibody and revealed a high level of cyclin D2 protein only in sample M5 (Fig. 3). In the DLBCL samples, the CCND2 mRNA was increased in 11 cases out of 104 (10.6%) (Fig. 4A). The median relative fold increase reached 3.6 (range 3.4–5.7). Detection of the cyclin D2 protein in the DLBCL cases by immunoblotting confirmed the results (Fig. 3). Cyclin D2 positivity was not associated with any specific morphologic subtype. The majority of cyclin D2-positive cases were ranked in the centroblastic variant (4/45) reaching a frequency of 8.9%. Among the immunoblastic cases, only one was cyclin D2-positive [1/8 (12.5%)]. Similarly, expression of cyclin D2 was not associated with any immunohistochemically derived subgroup, neither GCB/non-GCB nor 1/2. On the other hand, the cyclin D2 positivity was distinctively more frequent among secondary cases [6/23 (26.1%)] in comparison to cases de novo [5/81 (6.2%)].

Finally, we quantified the CCND3 transcripts (Fig. 4B). Overexpression of CCND3 mRNA was found in 6 of the MCL cases (19.3%) reaching a median of 3.3 (range 3.0–4.3). The M2 specimen exhibited high expression of all three cyclin D mRNAs. Concurrent overexpression of cyclin D2 and D3 mRNAs occurred in specimen M5. In the cohort of DLBCL cases, cyclin D3 mRNA overexpression occurred in 10 cases (9.6%) reaching a median relative fold increase of 3.19 (range 3.1–5.8). Two specimens, B3 and B41, expressed cyclin D2 concurrently with cyclin D3 mRNA. The level of the cyclin D3 protein was assessed by immunoblotting using the Ab-1 antibody in the DLBCL samples confirming the results of qRT-PCR (Fig. 5).

Relationship between the expression of cyclin D in DLBCL and disease outcome

Next, we investigated the relationship between the expression of D-type cyclins and overall survival (OS) and progression-free survival (PFS) of the DLBCL cases. The median survival time of the cohort of DLBCL patients was 39.1 months; 40.4% of patients survived 5 years. Cases exhibiting cyclin D2 expression demonstrated a trend toward worse OS and PFS, but this effect did not reach statistical significance (P=0.062 and 0.134, respectively). However, it reached clear statistical significance (P=0.016 for OS, and P=0.009 for PFS) for DLBCL cases de novo (Fig. 6). Expression of cyclin D3 was not associated with OS (P=0.958) and PFS (P=0.822) (data not shown).

Association of cyclin D2 and D3 with de novo CD5+ DLBCLs

The CD5 antigen expression was examined by immunohistochemistry. CD5 positivity was detected in 13 DLBCL cases (12.5%) including 8 de novo cases. The CD5-positive cases demonstrated a trend toward worse OS, but this effect did not reach statistical significance (P=0.124). Cyclin D2 was overexpressed in 25% of de novo CD5+ DLBCLs (2/8) and in 4.1% of de novo CD5 DLBCLs (3/73). A statistical analysis of this phenomenon was not performed because of the low number of cases in the CD5+ arm of the study, although the higher expression of cyclin D2 appeared to be connected to the CD5+ phenotype. The concurrent cyclin D3- and CD5-positivity was found in only one secondary case of DLBCL (D3) and it was not detected among the DLBCL cases de novo.

Discussion

In the present study, we performed expression analysis of cyclin D1, D2 and D3 in tumor samples from MCL and DLBCL cases using quantitative RT-PCR. This method is not performed as part of routine diagnostic procedures for MCL/DLBCL.

Cyclin D1 overexpression is a diagnostic marker of MCL and thus it is assessed routinely. Immunohistochemical analysis and/or fluorescence in situ hybridization (FISH) are almost exclusively employed techniques. It has been previously shown that assessment of cyclin D1 mRNA expression by qRT-PCR is helpful and is a specific tool for the diagnosis of MCL providing an alternative to FISH and immunohistochemistry (3235). In the first part of our study, we confirmed this. The MCL cases with translocation t(11;14) and a high level of the cyclin D1 protein also showed a high level of cyclin D1 mRNA. Second, the cyclin D1-positive MCL cases exhibited significant overexpression of cyclin D1 mRNA ranging from a 5- to 75-fold increase over the values found in the non-neoplastic specimens, thus reliably distinguishing cyclin D1 positivity from negativity. This was clearly documented also by analysis of the cyclin D1-negative MCL case M5 (27 -case 25B) as reported previously, which scored substantially under the cut-off level (Fig. 1A).

qRT-PCR is rapid, sensitive, specific, reproducible and thus a convenient technique for the routine analysis of gene expression. In comparison to other methods, it allows quantitative assessment of CCND1 mRNA. However, for diagnostic purposes, knowledge of the exact level of CCND1 mRNA (or protein) is often dispensable. Simple qualitative 'positive-negative' resolution may be sufficient. In addition, according to our experience, RNA isolated from formalin-fixed paraffin-embedded tumor tissue blocks is often degraded to such an extent that prevents reliable qRT-PCR analysis. From a practical point of view, the necessity to use fresh or deeply frozen tumor tissues may be limiting in some clinical institutions. Having the option to use formalin-fixed paraffin-embedded tumor tissue blocks clearly shifts the preference to FISH and IHC.

The CCND1 mRNA below the cut-off limit was detected in MCL case M5 that was previously described as cyclin D1-negative/cyclin D2-positive. In the previous report, cyclin D2 positivity was assessed by immunoblotting using the cyclin D2-specific antibody Ab-4 (27 - case 25B). In the present study, the level of cyclin D2 mRNA was analyzed by qRT-PCR. In this particular case, the analyses detected a high level of cyclin D2 mRNA indeed, thus confirming the earlier conclusion. Interestingly, one of the cyclin D1-positive MCL cases, M2, scored also positive for CCND2 mRNA by qRT-PCR analysis. Although we failed to detect the cyclin D2 protein in this case, the CCND1/CCND2 mRNA values were rather balanced as determined by competitive RT-PCR analysis (27 - case 27). On the other hand, a few more cases scored comparably balanced in CCND1/CCND2 mRNAs by competitive RT-PCR (27 - cases 30 and 32); none of them scored positive by the qRT-PCR analysis of CCND2 mRNA (cases M6 and M7).

Expression of CCND3 above the cut-off limit was observed in 6 MCL cases, including case M2 which scored positive for all three types of cyclin D, and M5 with concurrent high expression of cyclin D2. The competitive RT-PCR analysis showed that the level of cyclin D3 was generally very low compared to cyclin D1 and/or D2 (27). This suggests that although the 6 MCL cases exhibited a significantly elevated level of cyclin D3 mRNA relative to the non-neoplastic specimen, the real level may be very low.

Nevertheless, although the low incidence of cyclin D1-negative and cyclin D2- or D3-positive MCL cases has been confirmed (5), the presence of cyclin D2 or D3 is not specific for MCL and cannot be used as a criterion for reliable diagnosis of this disease. For example, Quintanilla-Martinez et al (36) found cyclin D2 in most B-cell non-Hodgkin lymphomas using immunohistochemistry. Cyclin D3 was also found in non-Hodgkin and classical Hodgkin lymphomas (18,37,38). In the present study, we confirmed that expression of cyclin D2 and D3 is not MCL-specific as we found several positive cases among the DLBCL patients.

In contrast to several studies (1518,20,21) we did not detect any cyclin D1-positive case in the cohort of 104 DLBCL patients. Apart from case reports, the incidence of cyclin D1 positivity among DLBCL cases described by others ranges from 1.5 to 4.3% with the exception of Vela-Chávez et al study (20) indicating 15%. The referred studies usually employed immunohistochemical detection of the cyclin D1 protein, while we performed quantitative assessment of CCND1 mRNA. This may be an explanation of the difference. In addition, the possibility of misdiagnosed positive DLBCL cases is not excluded as Ok et al (39) recently identified 6 tumors originally classified as cyclin D1-positive DLBCL and reclassified them later as likely pleomorphic MCL. Other authors also considered such misdiagnosed cases (15,21). Recently, a report of two blastoid B-cell lymphoma, most probably DLBCL cases, displaying the CCND1 gene rearrangement and high cyclin D1 expression suggests the existence of a diagnostic 'gray zone' between DLBCL and MCL (40). On the other hand, with respect to the size of our cohort (104 patients) and suggested the low prevalence of cyclin D1 positivity (1.5–4.3%) we cannot reliably exclude the rare occurrence of the cyclin D1-positive DLBCL case. Nevertheless, our results rather support the former idea of DLBCL cases as cyclin D1-negative or at least the very rare occurrence of cyclin D1 positivity among DLBCL cases (26,41).

The frequency of cyclin D2 positivity in DLBCL was found to vary between 13 and 62% in previous studies and it has been suggested as an adverse marker of DLBCL (12,18,22,23,28,42). The analyses were performed either immunohistochemically or by qRT-PCR. In our study, overexpressed CCND2 mRNA was found in 11 DLBCL cases (10.6%). Cyclin D2 expression was negatively related with overall survival but this effect was not statistically significant (P=0.062). However, when analyzing de novo and secondary DLBCL cases separately, we found that the cyclin D2 positivity, although much less frequent among the de novo cases [5/81 (6.2%)], represents a clear adverse marker. This result is in agreement with previous studies (13,22,28).

Overexpression of cyclin D2 was also found to be associated with CD5 positivity in DLBCL, especially in de novo cases (24). In our cohort, the low number of cyclin D2-positive cases also did not allow statistical analysis. Nevertheless, the tendency was rather clear. Cyclin D2 was overexpressed in 2 of 8 CD5-positive cases, while only in 3 of 73 CD5-negative cases.

The expression of cyclin D3 in DLBCL has been also studied by various groups and again with rather inconsistent results. The positivity assessed by immunohistochemistry scored between 20 and 62% (18,22,26). While Filipits et al (26) demonstrated that high expression of cyclin D3 in tumors (detected in 38% cases) is associated with a significantly lower complete remission rate and shorter 3-year overall survival, Hans et al (22), detecting cyclin D3 overexpression in 62% of cases, found no effect on survival. In our cohort, cyclin D3 mRNA positivity occurred in 9.6% DLBCL cases and we did not find any impact on overall survival (P=0.958). Part of the explanation, similarly to MCL cases, may be the actual level of cyclin D3 mRNA which seems to be substantially lower in comparison to cyclin D1 and D2 as indicated by competitive RT-PCR (27).

In conclusion, we used qRT-PCR to study the expression of cyclin D1, D2 and D3 in MCL and DLBCL cases. We showed that the cyclin D1 expression was limited to MCL and did not occur in DLBCL cases. Overexpression of cyclin D2, rare in MCL, occured in a distinct portion of the DLBCL cases and may serve as a negative prognostic marker. Expression of cyclin D3 was found in comparable frequency in both types of studied lymphomas but did not display any statistically significant effect on disease outcome.

Acknowledgments

We thank Eva Bartova and Ales Hampl/Dasa Dolezalova for providing us with the MOLP-8 and Jurkat cells. This study was supported by grant NT/13784-4/2012 of the Internal Grant Agency of the Ministry of Health of the Czech Republic, and by MH CZ - DRO (FNBr, 65269705).

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May-2016
Volume 35 Issue 5

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Spandidos Publications style
Zlamalikova L, Moulis M, Salek D, Jarkovsky J, Smarda J and Smardova J: Expression of D-type cyclins in mantle cell and diffuse large B-cell lymphomas. Oncol Rep 35: 2673-2680, 2016.
APA
Zlamalikova, L., Moulis, M., Salek, D., Jarkovsky, J., Smarda, J., & Smardova, J. (2016). Expression of D-type cyclins in mantle cell and diffuse large B-cell lymphomas. Oncology Reports, 35, 2673-2680. https://doi.org/10.3892/or.2016.4658
MLA
Zlamalikova, L., Moulis, M., Salek, D., Jarkovsky, J., Smarda, J., Smardova, J."Expression of D-type cyclins in mantle cell and diffuse large B-cell lymphomas". Oncology Reports 35.5 (2016): 2673-2680.
Chicago
Zlamalikova, L., Moulis, M., Salek, D., Jarkovsky, J., Smarda, J., Smardova, J."Expression of D-type cyclins in mantle cell and diffuse large B-cell lymphomas". Oncology Reports 35, no. 5 (2016): 2673-2680. https://doi.org/10.3892/or.2016.4658