Original article

Low total gamma globulin level discovery at diffuse large B-cell lymphoma diagnosis predicts high risk of infection-related death: data from a monocentric retrospective study

DOI: https://doi.org/10.4414/smw.2022.w30143
Publication Date: 06.06.2022
Swiss Med Wkly. 2022;152:w30143

Alexandre Nguyena*, Nicolas Martin-Silvaa, Hubert de Boyssona, Samuel Deshayesa, Anne-Claire Gacb, Emilie Reboursièreb, Gandhi Damajb*, Achille Aoubaa*

a Department of Internal Medicine and Clinical Immunology, Normandie Univ, UNICAEN, CHU de Caen Normandie, Caen, France

b Department of Clinical Haematology, Normandie Univ, UNICAEN, CHU de Caen Normandie, Caen, France

* Contributed equally to this work

Summary

OBJECTIVE: Diffuse large B-cell lymphoma can complicate the course of B-cell primary immunodeficiencies or induce lowering of total gamma globulin levels, whose clinical status as an effective secondary immunodeficiency remains unspecified. This study aimed to assess the frequency, and clinical and prognostic relevance of the low total gamma-globulin levels discovered at diagnosis of diffuse large B-cell lymphoma.

RESULTS: In a 2-year monocentric retrospective study, 96 patients diagnosed with diffuse large B-cell lymphoma who had a serum electrophoresis were included. Patients were divided into those with lower (L-TGL and higher (H-TGL) total gamma-globulin levels (total gamma-globulin levels ≤5.5 g/l and >5.5 g/l) and compared for outcomes, including fatal infectious events.  Twelve (12.5%; 8 males; age median  68 years, range 55—82 years) exhibited L-TGL. There was no difference between the both groups regarding demographics, Ann Arbor lymphoma stage, inflammatory parameters or chemotherapy regimen. However, overall death rates (10/12, 83.3% versus 22/96, 26.2%; p = 0.03) and infection-related death rates (10/12, 83% versus 6/96, 6.2%; p <0.001) were significantly higher in the L-TGL group.

CONCLUSION: We demonstrate for the first time the strong negative impact of L-TGL on overall and infection-related mortality in diffuse large B-cell lymphoma. Prospective studies should distinguish immunodeficiencies secondary to the lymphoma from pre-existing humoral primary immunodeficiencies, using biomolecular testing and post-treatment total gamma-globulin level monitoring, to determine the best management strategy for infectious risk during diffuse large B-cell lymphoma treatment in the context of L-TGL.

Introduction

Recurrent bacterial, viral, fungal and/or parasitic infections are the hallmarks of primary and secondary immunodeficiencies. The most common forms of primary immunodeficiency are related to inherited adaptive immune system dysfunctions involving B and/or T cells and are not infrequently discovered in adulthood. For secondary immunodeficiencies, the leading causes are related to chemotherapy or immunosuppressant use, or to underlying diseases such as cancers, lymphomas and systemic inflammatory/autoimmune diseases. Other causes and mechanisms of secondary immunodeficiencies result from protein wasting or metabolic disorders, including a severely impaired general state.

In addition to infections, other events, such as autoimmune cytopenias, cancers or lymphoproliferative disorders (including diffuse large B-cell lymphoma), can complicate the natural history of primary immunodeficiencies [1–3]. The most frequent subtype, common variable immunodeficiency, renders affected patients prone to developing lymphomas [4–7] and frequent infections, which is identified as the main feature, responsible for diagnosis and the leading cause of death in this population [2, 8, 9]. The diagnosis of primary immunodeficiencies is often delayed for several years, because of their clinical heterogeneity and higher frequency of minor and neglected infections. In this context, both the onset date and natural history of the different complications of primary immunodeficiencies, such as malignant events, remain little known.

We therefore hypothesised that diffuse large B-cell lymphoma with a datable diagnosis might also reveal primary immunodeficiencies with possible previous infectious events that had not led to the recognition of an immunodeficiency. No study has yet determined the prevalence in adults of primary immunodeficiencies revealed by lymphoma, since the diagnostic criteria of primary immunodeficiencies do not take into account lymphoma [10–15]. On the one hand, humoral primary immunodeficiencies, including common variable immunodeficiency, are frequent forms of immunodeficiency that can be suggested by a low serum total gamma-globulin level identified using serum electrophoresis performed at the time of diagnosis of diffuse large B-cell lymphoma. On the other hand, diffuse large B-cell lymphoma, the most frequent  lymphoproliferative disorder, can also induce a decrease in serum total gamma-globulin level owing to clonal selection and proliferation. However, the frequency, risk and prognosis of infectious events related to low total gamma-globulin (L-TGL) discovered at diagnosis of diffuse large B-cell lymphoma are unknown and no specific therapeutic strategy is therefore recommended in this context.  In the context of multiple myeloma or chronic lymphoid leukaemia, a L-TGL is well recognised to correspond to a secondary immunodeficiency with a documented increase in infectious events and risk that can require polyvalent immunoglobulin infusions [16–19].

The clinical relevance and utility of serum electrophoresis for identifying L-TGL in diffuse large B-cell lymphoma is unknown, both at diagnosis and during the therapeutic follow-up of the lymphoproliferative disorder. The association of serum electrophoresis and diffuse large B cell lymphoma is of particular interest, as serum electrophoresis can be easily and routinely performed at diagnosis of the lymphoma, in order to assess the functionality of the B-cell compartment. Diffuse large B cell lymphoma onset, unlike the onset of indolent lymphomas, can be easily dated based on B symptoms and rapid tumoral syndrome, allowing follow-up monitoring.

We conducted a retrospective study to assess the clinical and prognostic relevance of L-TGL discovery at the time of diagnosis of diffuse large B-cell lymphoma in Caen University Hospital. Our main judgment criteria were the frequency of L-TGL in comparison with higher (H-TGL) at diffuse large B-cell lymphoma diagnosis, the mortality rate and main causes of death, especially those related to infectious events, in the two subgroups.

Methods

Diffuse large B cell lymphoma patient cohort

Inclusion criteria and definitions

We retrospectively extracted from the monocentric lymphoma database of Caen University Hospital all patients diagnosed with diffuse large B-cell lymphoma between January 2015 and December 2016, and listed those with serum electrophoresis performed at diagnosis before receiving any specific treatment. Included patients were categorised into two groups based on their total gamma globulin level on serum electrophoresis at diagnosis, namely L-TGL or H-TGL. Although the diagnosis of common variable immunodeficiency requires a threshold <5 g/l of IgG isotype in addition to other biological, clinical and anamnestic criteria [20–22], we chose the total serum gamma-globulin level because it is an easily available biological test. We defined L-TGL as a total gamma-globulin level ≤5.5 g/l on serum electrophoresis as it is <50% of the lower limit of our laboratory reference range, is similar to what was used in others studies in haematological malignancies [19] and because IgG represents 75% of the total gamma-globulin level in the absence of monoclonal gammopathy, it would be unlikely to have more than 5 g/l of IgG.

Exclusion criteria

As our hypothesis was based on L-TGL being a possible marker of primary or secondary immunodeficiency related to the aggressive diffuse large B-cell lymphoma, we excluded all patients exhibiting an associated monoclonal peak on serum electrophoresis, unrelated loss of serum protein such as exudative enteropathy, extended burns or nephrotic syndrome, previous treatment with cytotoxic drugs or immunosuppressants, and previous primary or secondary immunodeficiency diagnosed before diffuse large B-cell lymphoma.

Ethics approval and consent

The study was approved by the Research Ethics Committee (CLERS) of Caen (ref: 03/2020/AOU).

Study variables

For all patients, demographic information at diagnosis, disease status, chemotherapy regimen, Ann Arbor staging classification, central nervous system  involvement, and international prognostic index and outcome data were collected until the last follow-up date. For biological data, C-reactive protein (CRP), albumin, lymphocyte count, lactate dehydrogenase and ferritin levels were collected at the time of diagnosis in the absence of an infectious process, and, when available, IgG, IgM, and IgA levels were recorded. We considered the albuminaemia/gammaglobulinaemia ratio (AG ratio) to discriminate possible causes for L-TGL: (1) for a nonspecific decrease in total gamma-globulin level related to an impaired general state , a decrease in albumin should be associated with a decrease in total gamma-globulin level, with an unaltered AG ratio; (2) for a specific decrease in total gamma-globulin level directly related to our hypotheses, i.e., L-TGL due to either an undiagnosed primary immunodeficiency or an immunodeficiency  secondary to the diffuse large B-cell lymphoma, the albumin level should be close to normal, resulting in an increase in the AG ratio.

Statistical analyses

Data were summarised as the median (range) or number (%). Continuous variables were analysed using the Mann-Whitney test, and Fisher’s test was used to compare categorical variables. A p-value <0.05 was considered statistically significant.

Predictors of death in diffuse large B-cell lymphoma were evaluated using Cox proportional hazard models. All the variables showing a univariate p-value less than 0.20 were entered into a multivariable logistic regression model. Results were expressed as hazard ratios (HRs) with 95% confidence intervals (95% CIs). Two-sided p-values lower than 0.05 were considered significant.

Overall survival in diffuse large B cell lymphoma and subgroups L-TGL and H-TGL were analysed using the Kaplan-Meier method, and these variables were compared using the log-rank test.

All statistical analyses were performed using GraphPad Prism software (7.0) and JMP 9.0.1 (SAS Institute Inc., Cary, NC, USA).

Results

Out of 122 patients diagnosed with diffuse large B-cell lymphoma during the pre-specified period, 96 (74.8%) had a serum electrophoresis test before any chemotherapy, and among these, 12 (12.5%; 8 males;age median 68 years range (55–89 years) had L-TGL. Demographic and biological data for both the L-TGL (n = 12; total gamma-globulin level ≤5.5 g/l) and H-TGL (n = 84; total gamma-globulin level >5.5 g/l) subgroups are summarised in table 1.

Table 1

Diffuse large B-cell lymphoma patient characteristics and outcome according to serum total gamma-globulin levels.

 All patientsp-valueDeceased patientsp-value
L-TGL (≤ 5.5 g/p) patientsH-TGL (> 5.5 g/p) patientsL-TGL (≤ 5.5 g/l) patientsH-TGL (> 5.5 g/l) patients
No.1284NA1022 
Sex (M/F)7/533/510.126/411/110.71
Age (years) median (range)65 (55–80)70 (21–89)0.8965 (57–80)72 (56–85)0.41
Lymphoma Ann Arbor StageI0160.69001
II1150.69121
III4150.29241
IV7380.607161
Central nervous system involvement (n)250.24211
Richter syndrome021021
International prognostic index risk group (n)10 (CNS excluded)77 (CNS and RS excluded) 8 (CNS excluded)19 (CNS and RS excluded) 
 (0–1) Low171100.31
(2) Low-intermediate2280.72121
(3) High-intermediate4190.48251
(4–5) High4230.734121
Total gamma-globulin level (g/l) median (range)4.8 (2.7–5.5)9.15 (5.9–19.3)<0.014.78 (2.7–5.5)9.25 (5.9–19.3)<0.01
Immunoglobulin isotype level (n)8460.807131
 IgG level (g/l) median (range)5.4 (2.8-5.45)9.6 (6.4–15.7)<0.015.45 (2.8–5.45)11.4 (6.48–13.8)<0.01
IgA level (g/l) median (range)0.7 (0.35–5.91)2.3 (0.3–5.0)0.310.61 (0.35–5.91)1.49 (0.3–2.16)0.31
IgM level (g/l) median (range)0.4 (0.2–3.7)1.0 (0.2–3.3)0.320.46 (0.2–3.7)1.26 (0.25–1.35)0.32
CRP level (g/l) median (range)31 (3–116)15 (3–237)0.3126.5 (3–116)37 (3–119)0.31
Ferritin level (µg/l) median (range)433 (73–1628)170 (4–3472)0.02538.5 (73–1628)217.5 (93–1496)0.02
Albumin level (g/l) median (range)32.5 (24–40.7)39 (16–50)0.1533.8 (24–40.7)36 (23–46)0.15
Serum total protein level (g/l) median (range)58.17 (46–90)64.5 (46–72)<0.0158 (46–90)63.5 (52–72)0.24
AG ratio median (range)6.79 (4.62–12.22)4.39 (1.7–7.13)<0.016.79 (4.62–12.22)4.15 (1.71–7.13)<0.01
LDH (U/l) median (range)341.5 (156–2784)278 (132–10091)0.93285 (156–2784)366 (162–2793)0.77
Lymphocyte count (G/l) median (range)0.8 (0.2–2.58)1.26 (0.18–7.56)0.020.8 (0.2–2.58)0.92 (0.27–7.56)0.27
Follow-up (months), median (range)15.2 (1.23–57.77)55.53 (1.17–68.6)<0.00111.7 (1.23–18.16)12.18 (1.17–64.23)0.02
Deaths10 (83.3%)22 (26.2%)0.0310 (83.3%)22 (26.2%)0.03
Causes of deathInfections10 (100%)6 (27.3%)<0.00110 (100%)6 (27.3%)<0.001
Diffuse large B-cell lymphoma progression0 (0%)12 (54.5%)0.350 (0%)12 (54.5%)0.35
Other causes0 (0%)4 (18%)10 (0%)4 (18%)1

TGL: total serum gamma-globulin level; L-TGL: lower-TGL; H-TGL: higher-TGL; NA: not applicable; IgG (or A, or M): serum  immunoglobulin G (or A or M); CRP: serum C-reactive protein; CNS: central nervous system; RS: Richter syndrome; LDH: lactate dehydrogenase

AG ratio: Ratio of serum albumin level to total serum gammaglobulin level

Ann Arbor staging and International prognostic index were comparable between the L-TGL and H-TGL groups. No Richter syndrome was reported in the L-TGL group, but two cases were described in the H-TGL group.

IgG level was lower in L-TGL patients regardless of albumin and inflammatory status

Immunoglobulin isotype levels were available only for two thirds (8/12) of L-TGL and  approximately half (46/84; 55%) of H-TGL patients: the median levels of IgG were significantly lower (p <0.001) in the L-TGL subgroup than in the H-TGL subgroup and in parallel with total gamma-globulin level levels, whereas the IgA and IgM levels were not significantly different (p = 0.31 and 0.32, respectively). No patient had detectable viral load for Epstein-Barr virus or cytomegalovirus or active bacterial infection at diagnosis.

The serum total protein level was lower (p <0.01) and AG ratio was higher (p <0.01) in L-TGL than in H-TGL patients. Even though higher serum ferritin levels were found in L-TGL patients than in H-TGL patients (p = 0.02), which could indicate higher biological inflammatory status or specific organ involvement, the levels of CRP were comparable in both subgroups.

Lymphocyte levels were significantly lower in L-TGL patients (p = 0.02), but comparable between the two groups for deceased patients (table 1).

Death and infection-related death rates were higher in the L-TGL subgroup

The mortality rate was higher in the L-TGL group 10/12, 83% versus 22/84, 26.2%; p = 0.03) and median follow-up was shorter (duration 15.2 months versus 55.53 months; p <0.001) than in H-TGL subgroup (table 1). Similarly, the rate of death caused by an infection was significantly higher in L-TGL than in H-TGL patients (10/10, 100% versus 6/22, 27.3%; p <0.001), as shown in table 1. In H-TGL patients, deaths were caused by diffuse large B-cell lymphoma progression for most patients (54.5%; 12/22 deceased patients), whereas the remaining patients (18.2%; 4/22 deceased patients) died from other causes that were independent of the background disease or related treatments.

among the infection-related deaths, no opportunistic infection was identified. All 10 deaths in the L-TGL subgroup and 3 out of 6 infection-related deaths in H-TGL subgroup were related to pleuro-pneumopathy, either associated or not with ear, nose and throat infections and/or Streptococcus pneumoniae. The remaining three H-TGL infection-related deaths were caused by septic shock complicating pyelonephritis, staphylococcal bacteraemia and cutaneous cellulitis of a diabetic foot.

As seen on Kaplan-Meier curves shown in figure 1, the survival of L-TGL patients was significantly lower (p <0.001) than all the other groups in the whole patient cohort, including H-TGL patients (n = 84), all patients who had a serum electrophoresis (i.e., L-TGL and H-TGL patients considered together; n = 96) and patients who did not have serum electrophoresis at diagnosis (n = 26).

fullscreen
Figure 1

Kaplan-Meier survival curves of diffuse large B-cell lymphoma patients according to serum total gamma-globulin levels.

TGL: total gamma-globulin levels; L-TGL: lower-TGL; H-TGL: higher-TGL; SEP: patients with serum electrophoresis; No SEP: patients without serum electrophoresis at diagnosis. Time is expressed in months on the x-axis.

No concordance between total gamma-globulin and albumin levels in L-TGL and H-TGL subgroups

Both subgroups were similar for all clinical and usual biological parameters including albumin levels, except for the median total gamma-globulin (p <0.01) and IgG levels (p <0.01), which were lower in L-TGL patients than in H-TGL patients, as expected. Moreover, the AG ratio was higher in L-TGL than in H-TGL patients (p <0.01), indicating that the decrease in total gamma-globulin level was more pronounced than that of albumin, suggesting that albumin serum level was unrelated to total gamma-globulin level in our diffuse large B-cell lymphoma patients subgroups.

Chemotherapy regimens were comparable between L-TGL and H-TGL subgroups

The distribution of chemotherapy regimens is shown in table 2 for deceased and living patients in both the L-TGL and H-TGL subgroups. First-line chemotherapy was the R-CHOP regimen (21-day interval; rituximab, cyclophosphamide, hydroxydaunorubicin, vincristine and oral prednisone) for 85 (88.5%) patients in total, whereas 3 others, all in the H-TGL subgroup, received ACBVP (2-week interval; daunorubicin, cyclophosphamide, bleomycin, vindesine, and oral prednisone) followed by sequential consolidation therapy consisting of two cycles of methotrexate because of their younger age; 7 others (2 and 5 in the L-TGL and H-TGL subgroups, respectively) received the RMPV regimen (rituximab, methotrexate, procarbazine and vincristine) because of cerebral involvement; the remaining patient was an elderly patient in the H-TGL subgroup who refused any chemotherapy.

A second-line chemotherapy regimen was chosen for 37 of the 96 patients (9 in the L-TGL and 28 in the H-TGL subgroups), whereas third- and fourth-line chemotherapy regimens were proposed for 10 patients and 2 patients in L-TGL and H-TGL subgroups. As shown in table 2, the characteristics of patients who died and those who remained alive at last follow-up in each subgroup appeared comparable, except for lymphoma stage: stage I lymphomas were significantly overrepresented in H-TGL patients who remained alive (p = 0.02; table 2). Of note, stage IV lymphoma and central nervous system involvement were not significantly associated with death among H-TGL patients, although the low number of events precluded any firm conclusion (table 2).

Table 2

Demographic, clinical and main biological characteristics in diffuse large B-Cell lymphoma deceased and sruviving patients, according to serum total gamma-globulin levels.

  L-TGL (TGL ≤5.5 g/l) patientsH-TGL (TGL >5.5 g/l) patients
  Deceased patientsPatients alivep-valueDeceased patientsPatients alivep-value
No. 102NA2262 
Sex (M/F)6/41/1NA11/1122/400.31
Age (years) median [range]65 (57–80)66 (55-78)NA72 (56–85)69 (21–89)0.07
Lymphoma Ann Arbor StageI00NA0160.02
II10NA2130.35
III22NA4111
IV70NA16220.09
Central nervous system involvement20NA141
Richter syndrome00NA200.07
IPI risk group (n)8 (CNS excluded)2 19 (CNS and RS excluded)58 (CNS excluded) 
 (0–1) Low10NA070.4
(2) Low-intermediate10NA2260.06
(3) High-intermediate22NA5141
(4–5) High40NA12110.02
Chemotherapy regimen
– First-lineR-CHOP8 (80%)2 (100%)0.1121 (95%)54 (87%)0.85
RMPV2 (20%)0NA1 (5%)4 (6%)1
ACBVP00NA03 (5%)0.56
– Second-line7 (70%)2 (100%)NA11 (50%)17 (27%)0.55
– Third-line3 (30%)0NA4 (18%)3 (5%)0.09
– Fourth-line1 (10%)0NA1 (5%)00.27
Total gamma-globulin level (g/l) median (range)5.2 (2.7–5.5)4.15 (3.8–4.5)NA9.25 (5.9–18.3)9.15 (5.9–17.9)0.82
Immunoglobulin isotype levels (n)71NA13331
 IgG level (g/l) median (range)5.45 (2.8–5.45)4.44NA11.4 (6.48–13.8)9.06 (6.38–14.6)0.16
IgA level (g/l) median (range)0.61 (0.35–5.91)1.11NA1.49 (0.28–2.16)1.42 (1.12–2.47)0.43
IgM level (g/l) median (range)0.46 (0.2–3.7)0.2NA1.26 (0.25–1.35)0.96 (0.18–1.44)0.57
CRP level (g/L) median (range)26.5 (3–116)65NA37 (3–119)11 (3–237)0.19
Ferritin level (µg/l) median (range)538.5 (73–1628)112NA217.5 (93–1496)151 (4–3472)0.47
Albumin level (g/l) median (range)33.8 (24–40.7)32 36 (23–46)39 (16–50)0.20
AG ratio median (range)6.79 (4.62–12.22)7.63NA4.15 (1.85–7.13)4.3 (1.7–6.61)0.64
LDH (t/l) median (range)285 (156–2784)776.5 (537–1016)NA373 (162–2793)278 (132–10091)0.69
Lymphocyte count (G/l) median (range)0.8 (0.2–2.58)0.62 (0.29–0.95)NA0.85 (0.27–7.56)1.26 (0.18–7.56)0.83

TGL: total serum gamma-globulin level; L-TGL: lower-TGL; H-TGL: higher-TGL; NA: not applicable; IgG (or A, or M) : serum immunoglobulin G (or A or M); CRP: serum C-reactive protein; CNS: central nervous system; RS: Richter syndrome; LDH: lactate dehydrogenase; AG ratio: ratio of serum albumin level to total serum gamma-globulin level

Hypogammaglobulinaemia at diagnosis is associated with a higher risk of death

Table 3 presents hazard ratios for the different variables studied using a Cox proportional hazards model. Ann Arbor stage IV was positively associated with the occurrence of death (HR 3.47, 95% CI 1.61–7.47; p <0.01). More interestingly, L-TGL was also found to be independently associated with a higher risk of death (HR 12.8, 95% CI 4.93–34.31; p <0.001), whereas H-TGL was associated with a lower risk of death (HR 0.21, 95% CI 0.09–0.46; p <0.01).

Table 3

Univariate and multivariate Cox proportional hazards model analysis examining factors associated with the occurrence of death in diffuse large-B cell lymphoma

 Hazard ratio (95% CI)Univariate p-valueMultivariate p-value
Sex1.4 (0.56–3.7)0.45 
L-TGL12.8 (4.93–34.31)<0.001<0.01
H-TGL0.21 (0.09–0.46)<0.01
Inflammation (CRP >10 mg/l)5.5 (1.54–35.2)<0.01NS
Hyperferritinaemia (Ferritin >300 ug/l)6.22 (1.5–41.9)0.01NS
Ann Arbor stage IV4.5 (1.6–16.02)<0.01NS
Cerebral involvement1.5 (0.24–5.42)0.59 
Richter syndrome4.16 (0.23–20.34)0.25 
Second-line treatment4.32 (1.6–13.5)<0.01NS
Third-line treatment1.76 (0.41–5.35)0.40 

CI: confidence interval; TGL: total serum gamma-globulin lLevel; L-TGL: lower-TGL; H-TGL: higher-TGL; NS: not significant; CRP: C-reactive protein

Discussion

This study is the first to estimate the frequency (12.5%) and emphasise the clinical utility of L-TGL determination using a systematic serum electrophoresis at diffuse large B cell lymphoma diagnosis . We demonstrated that L-TGL has a strong negative impact on the overall and infection-related mortality rates. The higher AG ratio in L-TGL subgroup suggests that the severe decrease in total gamma-globulin level and the associated clinical outcomes in the L-TGL subgroup may be (1)  independent of other possible associated nonspecific causes and (2) mostly and directly related to one of our two initial hypotheses: either a pre-existent undiagnosed primary immunodeficiency on which diffuse large B cell lymphoma occurred or a secondary immunodeficiency directly due to the lymphoma. For both hypotheses, considered alone or in combination, the secondary immunodeficiency induced by chemotherapy can worsen, or reveal a greater susceptibility to infections in L-TGL patients, but is unquantifiable in the design of our study. Our population was close to that described in France during this period of time, with a median age of 69 years, representing 35 to 40% of patients with lymphoma [23, 24]. In another study, 39% of infection-related death was also observed in multiple myeloma before the first line of treatment. Regarding overall cause of death in this disease, a rate of 17% was reported for infections, representing the third cause of death after disease progression and renal failure [25]. In  chronic lymphocytic leukaemia (CLL), which is another lymphoproliferative malignancy that frequently leads to lower immunoglobulin levels, infections were the main cause and the second cause of death, respectively, in an intermediate risk group and in all CLL patients [26]. Moreover, infections leading to death accounted from 8 to 60% of deaths in CLL patients [27, 28]. Finally, the proportion of 100% of infection-related death in L-TGL group in our study is higher than in these other conditions, but must take into account the stronger chemotherapy regimen in DLCBL.

At diffuse large B-cell lymphoma diagnosis, serum electrophoresis is not unanimously recommended according to the international work-group guidelines for malignant lymphoma [13–15]. However, in our study we advocated for serum electrophoresis at diagnosis. There were no significant differences between the two subgroups regarding inflammatory parameters, assessed using CRP level, and albuminaemia, suggesting that the decrease in total gamma-globulin level may not be secondary to metabolic/inflammatory causes or increased loss of immunoglobulins, but probably and directly related to low gamma-globulin production. Since neither the Ann Arbor staging classification, international prognostic index, nor the chemotherapy regimen were significantly different between the two groups, the increase in the overall and specific infection-related death rates may be attributed to the decrease in total gamma-globulin level in the L-TGL subgroup. We did not exclude Richter syndrome nor associated central nervous system involvement that could exhibit a worse malignant prognosis, because these patients were identified only in the H-TGL subgroup and neither subtype showed overall high mortality rate in this study. There was no stage I lymphoma in the L-TGL group, whereas the majority of  in the L-TGL group were stage IV, and this group had a poorer outcome. This could mean that L-TGL is linked to the severity of lymphoma, but the fact that stage IV lymphoma represented about half of the H-TGL group would go against this hypothesis. Hence, T-LGL appears to be a credible independent and deleterious prognosis factor, especially for infection-related death in diffuse large B-cell lymphoma patients. Therefore, we may consider that this study drew up an overall picture of all subtypes of diffuse large B cell lymphoma. Moreover, L-TGL patients exhibited a lower survival rate than all other possible subgroups of diffuse large B cell lymphoma, including patients who did not have  serum electrophoresis at diagnosis, confirming the importance of total gamma-globulin level assessment.

The main limitations of this study include its retrospective design with some missing data, including mainly immunoglobulin isotype levels, absence of systematic and reliable assessment of previous infections, and monitoring of total gamma-globulin level in follow-up for the entire cohort. Consequently, two main secondary objectives could not be reached in this study: determination of an approach for eventual common variable immunodeficiency diagnosis criteria and the leading cause of L-TGL considered herein, namely, primary or diffuse large B cell lymphoma-related secondary immunodeficiencies. We assumed that combining analyses of both diffuse large B cell lymphoma outcome and total gamma-globulin level after chemotherapy should partially help to differentiate between causes of decrease in total gamma-globulin level for each patient. Indeed, complete or partial remission of diffuse large B cell lymphoma and concomitant increase in total gamma-globulin level after chemotherapy would support the hypothesis of a diffuse large B cell lymphoma-related secondary immunodeficiency . Conversely, in cases of a lack of response or early death, no conclusion could be drawn, since chemotherapy would induce a further decrease in total gamma-globulin level for an unknown duration.

To conclude, epidemiological data on lymphoma treatment strategies are optimistic and have seen improvements in survival throughout the years. This study, using a simple, widely and easily available biological test, shows that the L-TGL patient subgroup exhibits a worse prognosis with higher overall and infection-related mortality than the H-TGL subgroup. Therefore, this study advocates for the need to systematically perform at least serum electrophoresis at diffuse large B-cell lymphoma diagnosis to improve our practice and emphasises the need to conduct prospective studies to confirm these results in order to: (1) determine nosological and prognostic distinctions between previously undiagnosed primary immunodeficiencies and diffuse large B-cell lymphoma-related secondary immunodeficiencies using, for example, next-generation sequencing methods to uncover molecular defects of humoral primary immunodeficiencies [22, 25] and to assess the timing of a possible total gamma-globulin level recovery after chemotherapy in relation to lymphoma outcomes; (2) assess the possible clinical benefit of immunoglobulin supplementation for secondary immunodeficiencies, or prophylactic antibiotics, taking into account advances in chemotherapy and management strategies in onco-haematology.

Availability of data and materials

The datasets analysed during the current study are available from Pr Gandhi Damaj on reasonable request.

Acknowledgements

Author contributions: AN A A performed the research and wrote the paper; NM-S designed the research study; HdB, SD, AA-V performed statistical analyses; A-CG, ER, GD entered patients into the registry.

Financial disclosure

This study received no specific funding for research.

Potential competing interests

All authors have completed and submitted the International Committee of Medical Journal Editors form for disclosure of potential conflicts of interest. No potential conflict of interest was disclosed.

Correspondence

Alexandre Nguyen, MD

Department of Internal Medicine and Clinical Immunology

CHU Côte de Nacre

Université Basse Normandie

Avenue de la Côte de Nacre

FR-14000 Caen

nguyen-a[at]chu-caen.fr

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