1Department of Clinical and Experimental Medicine, University of Pisa, 67-56127 Pisa, Italy.
2Department of Oncology, University Hospital of Pisa, 67-56127 Pisa, Italy.
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Aim: The main aim of the present study was to evaluate the overall survival (OS) and time to treatment failure (TTF) in a cohort of relapsed/refractory diffuse large B-cell lymphomas (DLBCLs) not eligible for high-dose therapy (HDT) treated with gemcitabine in association with dexamethasone, cisplatin and rituximab (GDP-R) protocol. The secondary aim was to identify the prognostic factors impacting OS and TTF.
Methods: The authors retrospectively analyzed 45 patients with refractory/relapsed DLBCLs treated with GDP-R.
Results: Overall response rate (ORR) was 48.8%; complete response 15/45 (33.3%), partial response 7/45 (15.5%). Response was influenced by the number of previous therapies administered and International Prognostic Index (IPI) value. Although no significant impact occurred with regard to OS, patients pre-treated with 2 or < 2 chemotherapeutic regimens had better ORR (P = 0.014) and a longer TTF (P = 0.029 in multivariate Cox model). IPI value also influenced TTF. Patients with < 2 IPI value had significantly more prolonged TTF than the other ones (P = 0.048 in multivariate Cox model). Treatment was well-tolerated, with the majority of patients treated on out-patient modality. GDP-R regimen represents a valid treatment for aggressive relapsed/refractory B-cell lymphoma not eligible for HDT thanks to its efficacy and good toxic profile.
Conclusion: The number of previous chemotherapeutic regimens and IPI value select those who benefit more from this treatment.
Cisplatin, dexhametazone, GDP, gemcitabine, relapsed/refractory diffuse large B-cell lymphomas
Diffuse large B-cell lymphomas (DLBCLs) are quite often curable with intensive combination chemotherapy. Despite the improvement of outcome with chemoimmunotherapy, 30-40% of patients relapse after the first-line treatment, and the rate of the second complete remission is lower than 30%.[1-3] Management of these cases is not well-established. High-dose therapy (HDT) with hematological stem-cell support is the standard treatment for chemosensitive patients. Induction salvage therapies are usually based on platinum and etoposide: R-DHAP (rituximab, dexamethasone, cytosine arabinoside, and cisplatin) and R-ESHAP (rituximab, etoposide, methylprednisone, Ara-C, and cisplatin) are generally used, but they are often characterized by poor responsiveness and significant toxicity. Gemcitabine, an antimetabolite drug, has shown significant activity in heavily pre-treated patients with NHL even after autologous stem cell transplantation (ASCT). Its favorable toxicity profile allows its use in combination regimens with other cytotoxic drugs and anti-CD20-targeted therapy with an overall response rate (ORR) of 50-60% in different phase II studies.[5-9] In the present retrospective study, we described the experience of our institution about the use of gemcitabine in association with cisplatin, dexamethasone, and rituximab (GDP-R), in relapsed/refractory DLBCLs not eligible for (HDT) with hematological stem cell support. The principal aims of this study were to evaluate the overall survival (OS) and treatment failure (TTF) and the prognostic factors impacting OS and TTF.
From February 2006 to July 2014, 45 relapsed/refractory DLBCLs patients treated with GDP-R at our Institution entered into the study. Eligibility criteria were men or women aged > 18 years; documentation of unresponsiveness disease according to the Cheson criteria, after one or more chemotherapeutic regimens; absence of renal, hepatic, and respiratory failure; no evidence of active infections; HIV-negativity; at least one site of measurable disease; and written informed consent. In particular, of a total of 45 studied patients, 37 (82%) relapsed after achieving an initial complete response (CR), while the remaining 8 patients (18%) were primary non-responders (primary refractory disease). Patient evaluation included a full history and clinical examination, complete serum biochemistry with dosage of lactate dehydrogenase (LDH) and β2-microglubulin, peripheral blood and bone marrow immunophenotyping, bone marrow biopsy, bone marrow molecular analysis, chest and abdomen and pelvic computed tomographic scan, serology for HIV, hepatitis-B virus and hepatitis-C virus. The age range of the cohort was 23-84 years. The number of previous therapies (NPTs) was also evaluated in this series. The first-line chemotherapy was R-CHOP (n = 35), R-DHAP (n = 2), and hyper-CVAD (n = 8). Most cases (27/45) received less than two previous chemotherapies; 20/45 cases had bone marrow involvement documented by biopsy (stage IV).
GDP-R regimen consisted of gemcitabine (1,000 mg/m2) intravenous (IV) on the days 1 and 8; cisplatin (75 mg/m2) IV on the day 1; rituximab 375 mg/m2 IV on the day 2; oral dexamethasone 40 mg on the days 1-4; this regimen was given every 3 weeks for a total of four courses. The standard anti-emetic regimen including ondansetron and dexamethasone was provided prior to chemotherapy. Chemotherapy was delayed on day 8 until recovery for a maximum of 3 weeks if the neutrophil count was < 0.5 × 109/L and/or the platelet count was < 50 × 109/L or if the patient showed grade 3/4 non-hematological toxicity (except for nausea, vomiting, and alopecia). The dose of cisplatin was reduced by 50% in the event of grade 2 neurological toxicity or grade 1 renal toxicity. In the event of febrile neutropenia, grade 4 thrombocytopenia or more than grade 3 non-hematological toxicity (except alopecia), treatment with 75% of the dose was given. Patient’s disease was evaluated for response 1 month after the end of treatment, and then every 3 months during the first 2 years and every 6 months for further 3 years. International Workshop NHL response criteria were used to assess the response to treatment. The toxicity was estimated and graded according to the National Cancer Institute Common Toxicity Criteria version 3.0 grading system. Side-effects were described in the overall population and in each of 2 subsets that were divided according to the International Prognostic Index (IPI) value and numbers of chemotherapeutic regimens as prognostic factors referred to OS and TTF.
Before performing survival analysis, an exploration phase was carried out. Categorical data were described by frequency and percentage, whereas continuous data by mean, median, and range.
CR and partial response (CR and PR, respectively, according to the Cheson criteria) in patients with more than 2 or 2 or < 2 chemotherapeutic regimens were assessed by using the Fisher exact test.
The survival was expressed as mean, median, and range. The endpoints studied included TTF (defined as the time from the beginning of treatment to further disease progression, relapse, or death) and OS (defined as the time from diagnosis to the last follow-up). Six variables (risk factors) were assessed in TTF and OS univariate and multivariate survival analysis: sex (male, female); age (≤ 65, >65); LDH (≤ 300, >300); stage (I-II, III-IV); IPI: (≤ 2, >2); and NPT (≤ 2, >2).
The results of the Cox regression were expressed using both the hazard ratios with its related confidence interval and related P value.
Survival curves were calculated using the Kaplan-Meier method and the log-rank test was used to evaluate the differences between curves. Univariate survival analysis was performed including each risk factor in a Cox regression model. All variables significantly influencing survival in the univariate analysis were analyzed together in a Cox regression model as multivariate analysis, with the aim of studying the independent contribution of each risk factor in explaining survivorship. Furthermore, the proportional hazard is always verified by using of log(-log) curves. The results of the Cox regression were expressed by hazard ratios with its related confidence interval and related P value calculated by Wald test. Regression coefficients (B) were also calculated. Statistics was applied to the overall population (n = 45) and to each of the two subsets that were obtained after all patients were divided according to whether the IPI value was ≤ 2 or > 2 and the number of chemotherapeutic regimens was ≤ 2 or > 2 (27 vs. 18 pts, respectively). The cut-off value for the number of previous chemotherapies and IPI was determined by a preliminary investigation considering the available data from the study.
Differences were considered significant at P < 0.05.
Analyses were performed using the SPSS 21 technology.
The principal clinical characteristics of patients are shown in Table 1. All studied patients had received 2 previous chemotherapeutic programs as median (range: 1-5). All cases were evaluable for response. ORR was 48.8%: CR 15/45 (33.3%); PR 7/45 (15.5%). At the time of this analysis, after a median follow-up of 22 months (range: 5-148), 4/22 responsive patients relapsed with a median duration of response of 10.5 months (range: 4-15). With a median follow-up of 57 months, the 2-year TTF and OS rates were 43% and 70%, respectively. No significant difference occurred with regard the OS in the 2 subsets divided according to the IPI value and numbers of chemotherapeutic regimens (P = 0.823 and P = 0.389, respectively) [Table 2]. Response was influenced by the NPTs. Of 45 patients, 27 were pre-treated with 2 or less than 2 chemotherapeutic regimens and 12 achieved CR, 5 PR, and 10 a stable/progressive disease (SD/PD), with an ORR of 17/27 (63%). The remaining 18 patients were pre-treated with more than 2 chemotherapeutic regimens. Three cases of them obtained a CR, one a PR, and the 14 remaining an SD/PD with an ORR of 4/18 (22%). Thus, patients pre-treated with 2 or < 2 chemotherapeutic regimens had better ORR (P = 0.014, Fisher exact test). TTF median time was 22.2 months for patients pre-treated with 2 or < 2 chemotherapeutic regimens and 2.7 months for the other ones [Figure 1] [P = 0.029 in multivariate analysis; Table 3]. Even IPI value was able to influence TTF: patients with IPI ≤ 2 had significantly more prolonged TTF than the other ones [P = 0.048 in multivariate analysis; Table 3].
Principal clinical characteristics of patients
|≤ 65 years||36||80|
|> 65 years||9||20|
|≤ 300 UI/L||18||40|
|> 300 UI/L||27||60|
OS risk factors
Figure 1. Time to treatment failure curves according to the number of previous chemotherapeutic regiments
TTF risk factors
|Univariate analysis||Multivariate analysis|
|P||HR||IC 95%||B||P||HR||IC 95%|
No serious adverse event was observed. The treatment was generally well-tolerated, with the majority of patients treated on out-patient modality. Neutropenia grades 2, 3, and 4 were, respectively, reported in 8.9%, 4.4%, and 2.2% of cases; whereas thrombocytopenia grades 2 and 3 were reported in 4.4% and 8.8% of patients, respectively. No febrile neutropenia was observed. Grade 2 neurotoxicity occurred in 2.2%, but no grade 3/4 neurotoxicity was reported. In 6 patients, creatinine levels (which not overcame 176 μmol/L) increased during treatment. Hospitalization was necessary in 1 case. As to toxicity not significant difference occurred in each subset of patients and it was not affected by the number of previous treatments. In fact, among 27 patients pre-treated with 2 or < 2 chemotherapeutic regimens, we recorded 8 cases of hematological toxicity (29%) and in the remaining 18 patients treated with more than 2 chemotherapeutic regimens, we recorded 5 hematological toxicity (28%) (P = ns).
About 40-60% of elderly patients with DLBCL will be refractory or will experience relapse during their clinical course. These and other patients are not eligible for ASCT due to old age, or important comorbidities and management of this population is not yet standardized. Many current regimens, such as DHAP, ICE, ESHAP, show an ORR between 39% and 69%, but remarkable side-effects are frequent.[3,4] Therefore, these regimens are not feasible for this subset of refractory/relapsed DLBCLs. Gemcitabine is a drug classified as a nucleoside analog. It is a competitive substrate with deoxycytidine for incorporation into DNA, and in this way, it inhibits DNA replication and repair. It is a derivative of cytidine and even if it is similar to cytosine arabinoside, it can be absorbed by cells faster, more effectively phosphorylated, and it remains in cells for a longer of time. Gemcitabine inhibits the DNA synthesis by preventing the activity of ribonucleotide reductase, and this conduces to a reduction of the concentration of intracellular nucleotide pool. In this way, gemcitabine has more antitumor activities and a lighter bone marrow inhibition than higher dosage of cytosine arabinoside.[5,6] As far as we know, one previous study only has been conducted using the same GDP-R regimen of chemoimmunotherapy in patients with refractory/relapsed DLBCLs as in our report. In this study, in 50 successive patients, the 2-year OS and progression-free survival were 70% and 48%, respectively. Hence, both these end-points was the same or similar to those we have reported in our study. ORR was 72% and grade III-IV neutropenia and thrombocytopenia occurred in 34% and 40% of patients. However, the schedule adopted by the investigators in this study was different than in ours. In fact, cisplatin was given at 25 mg/m2 IV on the days 1-3 instead of 75 mg/m2 on the day 1 and rituximab was delivered on the day 1 instead of on the day 2. These slight differences could have affected both ORR and toxicity that were higher than in our study. Moreover, another previous study evaluated the efficacy of GDP regimen given with the same schedule as in our study but not including rituximab. In this study, the ORR was 58.3% for assessable patients, and the 1-year OS rate was 41.7%.
This last value is much lower than that we have reported at 2-year in our study (70%) and suggests that the addition of rituximab to GDP regimen significantly increases its efficacy. However, an occurrence rate for grade III/IV leukopenia of 37.5% and 25% for thrombocytopenia was found. These rates are higher than those we have observed in our study and the reason is not clear. In our study, 45 patients with aggressive refractory/relapsed DLBCLs not eligible for ASCT were treated with GDP-R achieving an ORR of 48.8% with a median duration of response of 13.59 months (range: 2.13-58.6 months). Moreover, GDP-R resulted safe: no febrile neutropenia was recorded; grade-4 neutropenia was registered in one patient, and two patients developed grade-2 neurotoxicity. These data confirm GDP-R therapy is a reasonable option for refractory/relapsed DLBCLs in patients who are not eligible for ASCT. In particular, patients pre-treated with 2 or < 2 lines of therapy had a better ORR than that of ones (63% vs. 22%) receiving more than 2 lines before GDP-R, with a median TTF of 22.2 months vs. 2.7 months (P = 0.029 in multivariate Cox model). Even IPI influenced TTF with a median of 17.3 months for patients with IPI value less or equal to 2 and 3.4 months for patients with IPI > 2 (P = 0.048 in multivariate Cox model). These data suggest that exposition to numerous different chemotherapeutic regimens selects chemoresistant neoplastic cells that are difficult to be eradicated. Moreover, they suggest that within the entire population of patients with refractory/relapsed DLBCLs not eligible for ASCT the number of previous chemotherapeutic regimens and IPI value select those who benefit more from GDP-R treatment. It is likely that the disease was intrinsically more aggressive in patients with higher IPI index and in those who required multiple chemo-treatments. In fact, tumor phenotype and its biological aggressiveness are different in any cancer. In the multivariate analyses, among the evaluated prognostic factors, the number of previous chemo-treatments and IPI index were significant variables for TTF. This finding suggests that the number of previous chemo-treatments and IPI are independent prognostic factors. Moreover, tumor phenotype can change during the progression of the disease due to genetic instability of cancer cells. This could account for the lack of a significant correlation between the number of previous chemo-treatments or IPI and OS. In fact, prognostic factors other than the number of previous chemo-treatments and IPI and inherent to tumor phenotype can prevail with the progression of the disease.
In conclusion, the shown results, even if based on a retrospective monocentric study and a small sample size, evidence that for patients with relapsed/refractory DLBCL, who cannot benefit from HDT and GDP-R is a reliable and well-tolerated therapeutic choice.
There are no conflicts of interest.
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