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Year : 2018  |  Volume : 148  |  Issue : 3  |  Page : 284-290

Experience with non-cremophor-based paclitaxel-gemcitabine regimen in advanced pancreatic cancer: Results from a single tertiary cancer centre

1 Department of Medical Oncology, Tata Memorial Hospital, Mumbai, India
2 Department of Medicine, H. M. Patel Center for Medical Care & Education, Anand, India
3 Department of Surgical Oncology, Tata Memorial Hospital, Mumbai, India
4 Department of Interventional Radiology, Tata Memorial Hospital, Mumbai, India

Date of Submission10-Feb-2017
Date of Web Publication13-Nov-2018

Correspondence Address:
Dr Anant Ramaswamy
Department of Medical Oncology, Tata Memorial Hospital, Dr. E. Borges Road, Parel, Mumbai 400 012, Maharashtra
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/ijmr.IJMR_249_17

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Background & objectives: Gemcitabine combined with non-cremophor-based paclitaxel is one of the standards of care in advanced inoperable pancreatic cancer. This study was undertaken to retrospectively evaluate real world non-trial outcomes with this combination.
Methods: Patients with histologically proven advanced inoperable pancreatic adenocarcinoma (PDAC), treated with non-cremophor-based paclitaxel-gemcitabine combination (PG) (gemcitabine-nanoxel or gemcitabine-abraxane) between January 2012 and June 2015, were retrospectively analyzed. Response assessment was done every 8-12 wk with computed tomography scan and responses were measured as per the Response Evaluation Criteria in Solid Tumours 1.1 criteria where feasible. Toxicity was recorded as per the Common Terminology Criteria for Adverse Events (CTCAE) v4 criteria. Progression-free survival (PFS) and overall survival (OS) were calculated using the Kaplan-Meier method.
Results: A total of 78 patients with PDAC were treated with the combination. Of these, 83.3 per cent of patients had metastatic disease. The median number of chemotherapy cycles administered was three. The objective response rate for the whole group was 30.8 per cent. Grade III/IV toxicities were seen in 35.9 per cent of patients. Median PFS was 5.6 months and median OS was 11.6 months.
Interpretation & conclusions: Non-cremophor-based paclitaxel in combination with gemcitabine appeared efficacious for advanced pancreatic cancers in routine clinical practice. Within the confines of a single-centre retrospective analysis, gemcitabine-nanoxel and gemcitabine-abraxane appeared to have similar efficacy and toxicity in advanced pancreatic cancers.

Keywords: Advanced pancreatic cancer - non-cremophor-based paclitaxel-gemcitabine - PDAC - unresectable cancer

How to cite this article:
Ostwal V, Sahu A, Zanwar S, Nayak L, Shrikhande SV, Shetty N, Gupta S, Ramaswamy A. Experience with non-cremophor-based paclitaxel-gemcitabine regimen in advanced pancreatic cancer: Results from a single tertiary cancer centre. Indian J Med Res 2018;148:284-90

How to cite this URL:
Ostwal V, Sahu A, Zanwar S, Nayak L, Shrikhande SV, Shetty N, Gupta S, Ramaswamy A. Experience with non-cremophor-based paclitaxel-gemcitabine regimen in advanced pancreatic cancer: Results from a single tertiary cancer centre. Indian J Med Res [serial online] 2018 [cited 2021 Sep 20];148:284-90. Available from:

Advanced pancreatic cancer remains a major clinical problem with a very high mortality to incidence ratio and accounts for roughly seven per cent of all cancer-related deaths worldwide, although it does not figure amongst the top ten most common cancers in India as per population-based registries[1],[2],[3],[4]. Although research in the area has improved our understanding of pancreatic cancers, this has not yet translated into improvement in outcomes[5]. Conventionally, locally advanced and metastatic pancreatic cancers have been associated with poor prognosis with median survival of about 8-14 and 4-8 months, respectively[5],[6],[7],[8]. Various chemotherapeutic agents and regimens have been evaluated, and a few have been shown to improve survival. Gemcitabine-based combination chemotherapy regimens and FOLFIRINOX (5 Fluorouracil-Irinotecan-Oxaliplatin-Leucovorin) appear to be the most active regimens[9],[10],[11]. Results of the phase III Metastatic Pancreatic Adenocarcinoma Clinical Trial (MPACT) study have established gemcitabine in combination with albumin-bound paclitaxel as one of the standard first-line regimens for metastatic pancreatic cancer based on an overall survival benefit compared to gemcitabine monotherapy[12].

Cremophor free paclitaxel has the advantage of lesser pre-medications and fewer allergic infusion reactions compared to conventional paclitaxel[13]. Abraxane is also proposed to have some unique molecular and biological characteristics that contribute to its anti-tumour mechanisms[14],[15],[16]. Nanoxel is a polymer and surfactant bound paclitaxel that also avoids the infusion reactions associated with paclitaxel[17]. A cost-efficacy analysis by Ranade et al[18] showed a three-week cycle with nanoxel cost-effective when compared with cremophor-based paclitaxel using a complex economic model that took all costs associated with administration and adverse events with the two drugs into consideration[19]. Other nanotechnology-based non-cremophor paclitaxel formulations have been used in advanced pancreatic cancers with reasonable efficacy[19],[20]. The primary objective of this study was to evaluate the survival of patients with unresectable/metastatic pancreatic cancer treated with non-cremophor-based paclitaxel-doublets (abraxane-gemcitabine and nanoxel-gemcitabine) in the routine clinical practice while the secondary objective was to assess adverse events and toxicity profile.

   Material & Methods Top

All patients with histologically proven locally advanced or metastatic pancreatic cancers diagnosed at the department of Medical Oncology at Tata Memorial Hospital, Mumbai, India, between January 2012 and June 2015 and treated with either gemcitabine-abraxane (GA) or gemcitabine-nanoxel (GN) were included in this retrospective analysis. The study was approved by the Institutional Ethics Committee (IEC No IEC/0216/1644/001). Baseline clinical and demographic variables were recorded. The decision to use either abraxane or nanoxel-based therapy was taken by the primary treating physician based on the in-house availability of the drug, discussion of the cost-benefit ratio of the regimens and patient preference. From January 2014 onwards the patients were offered nanoxel as an alternative non-cremophor paclitaxel. Patients not able to afford abraxane were also offered nanoxel.

Treatment details: Patients received a 30 min intravenous infusion of abraxane or nanoxel at a dose of 125 mg/m2 followed by an infusion of gemcitabine at a dose of 1000 mg/m2, on days 1, 8 and 15 every four weeks. The dose was reduced to 75 per cent in cycle 1 in patients with serum albumin <3.0 g/dl and in subsequent cycles in case of a grade III/IV toxicity in the previous cycle and restarted once the toxicity had settled to grade I or completely recovered as per our institutional practice. Therapy was withheld in the event of any life-threatening toxicity, deterioration in patient's performance status or disease progression. Response assessment was done every 8-12 wk or as and when felt clinically relevant with a contrast-enhanced computed tomography (CECT) scan of the thorax, abdomen and pelvis. Response was assessed using Response Evaluation Criteria in Solid Tumours (RECIST) v1.1 by treating clinician or with the help of radiologists associated with gastrointestinal disease management group[21]. In case of non-measurable lesions, the response was not quantified. Complete response, partial response, stable disease and progressive disease were defined as per RECIST 1.1. Clinical benefit (CB) was defined as lack of disease progression at two consecutive response assessments (16-24 wk after starting treatment). Toxicity was documented using the Common Terminology Criteria for Adverse Events (CTCAE) criteria v4.03[22]. Subsequent therapy on progression was based on patient's performance status and was at the treating physician's discretion.

Statistical analysis: The data were retrieved from a prospectively maintained database. Overall survival (OS) was calculated from the date of starting chemotherapy to date of death from any cause or date of the last follow up. In patients with locally advanced pancreatic cancer, once the decision for inoperability was taken, then the date of start of chemotherapy was retrospectively used for calculation of OS. Progression-free survival (PFS) was calculated from the date of start of GA or GN until the date of documented radiologic or clinical progression, death or loss to follow up. Survival functions were calculated using the Kaplan-Meier method. The median PFS and OS of the two treatment groups, GA and GN, were compared using the log-rank test.

   Results Top

Seventy eight patients of locally advanced or metastatic pancreatic cancer were treated with GA or GN between January 2012 and June 2015. Median age at diagnosis of metastatic disease or inoperable disease was 60 yr (range: 24-84 yr) and 62.8 per cent of patients were males. Majority of the patients had metastatic disease at presentation (83.3%) and were treatment naïve (68%). The baseline characteristics are summarized in [Table 1].
Table 1: Baseline demographic and clinical characteristics of patients (n=78)

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GA combination chemotherapy was used in 57 (73.1%) patients, whereas 21 patients (26.9%) received the GN combination. The median number of cycles of chemotherapy received for the whole group was three. Eighteen patients (23.1%) received cycle 1 at a reduced dose of 75 per cent because of low albumin (<3.0 g/dl). Dose reduction in subsequent cycles was done in 14 patients (17.9%) due to grade III/IV toxicity. Delay in chemotherapy due to toxicity was seen in 18 patients (23.1%). The CB rate was 48.7 per cent (95% confidence interval (CI) –37.2-60.3) and overall response rate was 30.7 per cent (95% CI –21.8-42.3).

Toxicity profile: Grade III/IV toxicity was seen in 28 patients (35.9%). There was no significant difference in any grade III/IV toxicity between the GA and GN regimens. The rate of grade III/IV neutropenia and thrombocytopenia was higher in the GN group, but this did not reach statistical significance. Chemotherapy was withheld in 11 patients (14.1%) of whom nine had received GA chemotherapy. One patient died due to chemotherapy-related neutropenic sepsis. The toxicity details are shown in [Table 2].
Table 2: Toxicity with gemcitabine - abraxane and gemcitabine - nanoxel (Grade 3 and Grade 4 events)

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Treatment outcomes: At a median follow up for all patients of 11.4 months (range: 2-23 months), the median overall survival was 11.6 months (95% CI –8.8-14.3) and two-year estimated OS was 12 per cent. There was no significant difference in the median overall survival between the chemotherapeutic regimens [median OS - GA vs. GN –9.3 months (95% CI –5.7-13) vs. 14 months (95% CI –6.0-22); P=0.255] [Figure 1].
Figure 1: Kaplan-Meier curve for overall survival for abraxane-gemcitabine and nanoxel-gemcitabine.

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The median PFS for the whole group was 5.6 months (95% CI –3.7-7.4) with a one year PFS of 11.2 per cent. There was no significant difference in PFS between the two regimens [median PFS - GA vs. GN –5.7 months (95% CI –2.7-7.6) vs. 5.2 months (95% CI –2.5-8.8); P=0.84][Figure 2].
Figure 2: Kaplan-Meier curve for progression free survival for abraxane-gemcitabine and nanoxel-gemcitabine.

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   Discussion Top

Limited efficacies of chemotherapeutic agents and dismal outcomes have plagued the treatment of advanced pancreatic cancers over the years. With current evidence supporting the use of gemcitabine-based combination with albumin-bound paclitaxel and FOLFIRINOX, it is important to choose an appropriate regimen for patients, taking into account age, comorbidity status, Eastern Cooperative Oncology Group Performance Status (ECOG PS) amongst other variables. The reduced infusional toxicity with non-cremophor-based paclitaxel leading to the lesser need of premedication with dexamethasone along with the preclinical evidence of improved efficacy with a more linear dose-response curve compared to traditional paclitaxel (Taxol) and improved survival have made these agents an important component in the therapeutic armamentarium against advanced pancreatic cancer[12],[14],[15],[16],[23].

Our study looked at two non-cremophor-based paclitaxel preparations which were used in combination with gemcitabine for locally advanced and metastatic pancreatic cancers. The primary aim of the study was to examine the usage and performance of these agents in routine clinical practice. A retrospective analysis has suggested that a modified two weekly abraxane/gemcitabine schedule appears to retain its survival benefit along with lesser toxicity and is more cost effective[24].

In our study, 73.1 per cent of the patients opted for abraxane-based combination therapy. This was expected as the efficacy and overall survival advantage of abraxane-gemcitabine combination has been proven in phase III randomized controlled trial[12]. Nanoxel has not been compared in a clinical trial with abraxane. Although a preclinical study conducted in athymic nude mice comparing abraxane and nanoxel along with a third cremophor free paclitaxel formulation found superior anti-tumour activity with abraxane, at equitoxic doses; the interpretability of this study was limited by the small numbers in each group (n=10 per group)[25]. Other non-cremophor paclitaxel formulations have shown efficacy in phase II studies in advanced pancreatic cancers further supporting the role of nanoxel as a potential option in advanced pancreatic cancers[19],[20].

The overall survival of our patients compares well with published data from other studies using gemcitabine-non cremophor paclitaxel in advanced pancreatic cancers [Table 3][12],[26],[27],[28]. The survival of the patients on abraxane and nanoxel was not significantly different in our study. This suggested that nanoxel might have comparable activity to abraxane, but the small numbers undermined the strength of this finding. This study was not powered to statistically compare the abraxane and nanoxel group and should only be considered as preliminary data to suggest the feasibility of using gemcitabine-nanoxel in pancreatic cancers. With regard to toxicity, both drugs were comparable with no significant difference in rates of grade III/IV adverse events. Compared with the toxicity data from the MPACT trial[12], the rates of grade III/IV neutropenia were much lower in our study. This could be due to the difference in the dose modification protocols used in our study. However, the febrile neutropenia rate was higher in our study. Grade III/IV peripheral neuropathy also appeared to be lower in our patients even though the median number of chemotherapy cycles were similar to that delivered in the MPACT trial.
Table 3: Comparative analysis of studies using gemcitabine - nab paclitaxel regimen

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Amongst the other chemotherapy regimens used in advanced pancreatic cancers, FOLFIRINOX has shown improvement in survival and quality of life, but its applicability is limited to only the fit patients of the lot[11]. This was reflected in a previous report from our centre where only 6.9 per cent of treatment-naïve metastatic pancreatic cancers received FOLFIRINOX as their first-line treatment[29]. Barring the minuscule but significant survival benefit observed with gemcitabine/erlotinib combination in a single phase III randomized study, other combination chemotherapies like gemcitabine-capecitabine have failed to show improvement in survival over gemcitabine alone[30]. Thus, gemcitabine in combination with abraxane remains an important and a standard first-line regimen for metastatic pancreatic cancer.

Limitations of this study included the small numbers and its retrospective nature. The study was not powered to show the actual efficacy of a nanoxel-based chemotherapeutic regimen; it only suggested feasibility. However, it provided some evidence of the two regimens being relatively comparable in their toxicity and efficacy.

In conclusion, non-cremophor paclitaxel in combination with gemcitabine appeared to have modest efficacy in unresectable/metastatic pancreatic cancer, and the outcomes in this study were similar to previously published data. Within the confines of a single-centre retrospective analysis, gemcitabine-nanoxel and gemcitabine-abraxane appeared to have similar efficacy and toxicity in advanced pancreatic cancers. Prospective studies looking at cost-effective nanoparticle-based paclitaxel formulations represent an important area for future research.

Financial support & sponsorship: None.

Conflicts of Interest: None.

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