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ORIGINAL ARTICLE
Year : 2013  |  Volume : 9  |  Issue : 3  |  Page : 392-396

Concurrent chemoradiation with weekly Cisplatin, Docetaxel and Gefitinib: A study to assess feasibility, toxicity and immediate response


1 Department of Medical Oncology, Madras Medical College, Chennai, Tamil Nadu, India
2 Department of Oncology, Vinayaka Missions Kirupananda Variyar Medical College & Research Institute, Salem, Tamil Nadu, India

Date of Web Publication8-Oct-2013

Correspondence Address:
Prasad Eswaran
Department of Medical Oncology, Madras Medical College, Chennai, Tamil Nadu
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0973-1482.119313

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 > Abstract 

Objectives: Addition of docetaxel in the treatment regimen has shown improvement in survival of head and neck squamous cell carcinoma (HNSCC) patients. This study was conducted to evaluate the maximum tolerated dose of weekly docetaxel when combined with concurrent administration of weekly cisplatin, daily gefitinib, and radiation therapy.
Materials and Methods: 21 patients with newly diagnosed HNSCC were included. Radiation therapy was planned to a dose of 66 Gy/33 fractions. Doses of cisplatin and gefitinib were kept constant at 30 mg/m 2 and 250 mg respectively. Dose of weekly docetaxel started with 5 mg/m 2 and escalated 5 mg/m 2 up to a maximum of 20 mg/m 2 . Serious adverse event was defined as grade 3/4 hematological and non-hematological toxicities.
Results: All patients (three in dose level 1 [5 mg/m 2 ], level 2 [10 mg/m 2 ] and level 3 [15 mg/m 2 ]) did not experience any hematological serious adverse events. Weekly docetaxel of 20 mg/m 2 could not be tolerated with the combination, and we encountered two hematological (neutropenia) serious grade 4 adverse event and one grade 3 mucositis at level 4. Six patients were treated by omitting week 3 chemotherapy reducing the number of weekly cycles to a minimum of four. Gefitinib was continued throughout the treatment period. All patients tolerated the treatment well although with grade 2 hematological/non hematological toxicities.
Conclusion: The maximal tolerated dose of weekly docetaxel added to weekly cisplatin and daily gefitinib during concurrent chemoradiation is 15 mg/m 2 . Toxicity profile is tolerable with a break in the chemotherapy regimen during radiation therapy. Aggressive nutritional support is essential prior to this regimen.

Keywords: Cisplatin, docetaxel, gefitinib, head and neck neoplasm, radiation therapy


How to cite this article:
Eswaran P, Azmi KS. Concurrent chemoradiation with weekly Cisplatin, Docetaxel and Gefitinib: A study to assess feasibility, toxicity and immediate response. J Can Res Ther 2013;9:392-6

How to cite this URL:
Eswaran P, Azmi KS. Concurrent chemoradiation with weekly Cisplatin, Docetaxel and Gefitinib: A study to assess feasibility, toxicity and immediate response. J Can Res Ther [serial online] 2013 [cited 2019 Nov 21];9:392-6. Available from: http://www.cancerjournal.net/text.asp?2013/9/3/392/119313


 > Introduction Top


Head and neck squamous cell carcinoma (HNSCC) is the most common malignancy in developing countries commonly presenting as advanced loco-regional disease. Concurrent Chemoradiation has shown a survival benefit of 4% at 2 years and 5 years compared to radiotherapy alone. [1] Meta-analysis of all chemoradiation trials showed the superiority of concurrent chemotherapy over induction chemotherapy. [2],[3],[4] Analysis of cisplatin based chemotherapy trials showed a survival benefit favoring the practice of induction chemotherapy. [5],[6],[7] TAX 323 and 324 trials had demonstrated the benefit of addition of docetaxel in induction chemotherapy (TPF) with significant improvement in progression free and overall survival. [8],[9] Newer trials demonstrated negative results, but the results are considered with caution due to the smaller sample size and shorter induction cycles. [10],[11] However, with delaying a definitive loco-regional modality, the theoretical possibility of emergence of resistant clones exists with induction chemotherapy.

Docetaxel has a good response rate (35%) in recurrent HNSCC as a single agent. [12] Trials have demonstrated mitotic arrest (G2/M arrest) and potent radiosensitization in preclinical models and its toxicity and efficacy in phase I/II trials. [13],[14],[15],[16] Cisplatin inhibits radiation induced deoxyribonucleic acid (DNA) double strand damage. Gefitinib had been shown to radiosensitize tumor by a variety of mechanisms by inducing G0/G1 cell arrest and induction of apoptosis. [17],[18] Moreover, epidermal growth factor receptor (EGFR) kinase expression promotes the acquisition of stem cell like properties in cancer cells. These cells when treated with gefitinib had lesser potential to invade and become more sensitive to cisplatin induced cytotoxicity. [19] Hence, combination treatment with chemotherapy and EGFR inhibition might be an effective strategy in HNSCC. [18],[20]

Our previous experience with gefitinib and cisplatin showed that the combination is feasible and tolerable with better response rates. [21] We tried to incorporate docetaxel along with cisplatin, gefitinib and radiation therapy in HNSCC to assess its feasibility, toxicity, and immediate response rate as this combination is not reported in the literature.


 > Materials and Methods Top


Patients

Patients aged 18-65 years with good performance status (Eastern Cooperative Oncology Group (ECOG) 0, 1) and histologically confirmed unresectable advanced HNSCC (except oral cavity) were included [Table 1]. Distribution per Tumor (T) and Node (N) status is given in [Table 2]. All had adequate renal and hepatic functions. Institutional review board approved the proposal (Research and Ethical Committee). A detailed explanation of the trial was given to patients before obtaining written consent for participation in the trial.
Table 1: Patient characteristics

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Table 2: Distribution by T and N status prior to treatment

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Pre-treatment evaluation

All patients were evaluated with blood investigations (complete blood count, liver function test and renal function test), chest X-ray and computed tomography of the head and neck region. Patients were advised to undergo percutaneous endoscopic gastrostomy (PEG) tube insertion before treatment, but it was not necessary for the trial.

Radiation therapy

After simulation, external beam radiation therapy (EBRT) was delivered with Linear accelerator up to a total dose of 66 Gy/33 fractions. Phase I was up to 40 Gy after which radiation portals were modified for shielding spinal cord. Phase II was up to 60 Gy. Final 6 Gy was delivered to gross residual disease.

Chemotherapy

Dexamethasone 4 mg was given twice daily for 3 days with adequate anti emetics. Docetaxel was started at 5 mg/m 2 and given in incremental doses of 5 mg/m 2 at each cohort level. Weekly cisplatin was given at a dose of 30 mg/m 2 . Gefitinib was given at fixed daily doses of 250 mg. Granulocyte Colony Stimulating Factor was not given. Patients were initially planned to receive a minimum of five cycles of weekly chemotherapy.

Assessment of toxicity

During EBRT, all patients were assessed for toxicity weekly during treatment as per National Cancer Institute - Common Terminology Criteria for Adverse Events v3. They were assessed again 6 weeks after completion of EBRT for toxicity and response.

Study design

The study was designed to be conducted as per modified Fibonacci series. All cohorts received 30 mg/m 2 of weekly cisplatin and gefitinib 250 mg daily. Weekly docetaxel was started at 5 mg/m 2 and escalated 5 mg/m 2 every cohort level until serious adverse events (SAE) are encountered in a given level. SAE is defined as grade 3/4 hematological toxicity (neutropenia and thrombocytopenia) and non-hematological toxicity (except nausea, vomiting and mucositis) persisting more than a week. Chemoradiation was suspended if the neutrophils or platelet count were less than 1,000 cells/mm 3 and 75,000 cells/mm 3 respectively. Treatment was continued once the counts normalized. If one SAE occurred, additional cohorts of three patients were enrolled at that level. If no patient developed an SAE in this second cohort, dose escalation continued. If two or more cases of SAEs were observed in a given cohort, dose escalation was stopped. This was designated as the dose-limiting toxicity. The maximal tolerated dose (MTD) was defined as the dose level before the dose that induced two or more SAEs. Although mucositis was considered in weekly assessment for treatment purposes, it was not considered as SAE in this study. A treatment break of 1 week was allowed for relief of mucositis.


 > Results Top


Level 1-3

All patients at levels 1 and 2 (docetaxel 5-10 mg/m 2 , cisplatin 30 mg/m 2 and gefitinib 250 mg) had grade 1 and 2 hematological and non-hematological toxicities. One patient in level 2 and two in level 3 had grade 3 mucositis, but was not considered SAE as per the pre-defined criteria. No other SAEs encountered in these levels. Treatment breaks were more common in level 3 due to mucositis [Figure 1], [Figure 2] and [Figure 3].
Figure 1: Toxicity profile in level 1

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Figure 2: Toxicity profile in level 2

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Figure 3: Toxicity profile in level 3

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Level 4

Of the three patients in level 4, two patients developed grade 3 febrile neutropenia. One patient had severe pain (grade 4) due to mucositis at 42 Gy and needed injectable morphine/fentanyl patch for pain control. He discontinued further treatment and was lost for follow-up. Another patient had grade 3 pain due to mucositis [Figure 4]. One patient had grade 3 diarrhea during neutropenic episode probably due to infection [Figure 5]. These events were considered SAEs and the MTD was considered at dose level 3 [Table 3].
Figure 4: Grade 3 Toxicity

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Figure 5: Toxicity profile in level 4

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Table 3: Dose levels and no. of patients with SAE

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Confirmation of MTD

Three more patients were included at dose level 3 and were assessed for toxicity. There were no SAEs although overall treatment time was prolonged (Median - 68, Range - 62-72 days) by grade 3 mucositis in two more patients. A total of four patients had grade 3 mucositis in level 3 (66%).

Modification of MTD (Level 3A)

We continued our trial for six more patients with modification of the level 3 dose, skipping week 3 chemotherapy (2 weeks on and 1 week off) reducing the total number of weekly chemotherapy administration to a minimum of four cycles. However, gefitinib was continued throughout the treatment period. All patients tolerated the treatment well although we had grade 2 hematological/non hematological toxicities. Compliance was better with the modified MTD. One patient had grade 3 mucositis [Figure 6].
Figure 6: Toxicity profile in level 3 A

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Response rate

Although, this trial was not intended to measure response rates, it is reported as a secondary endpoint. The immediate response rate was 100% (Complete response - 18/21 [85.7%] and Partial response - 3/21 [14.3%]).


 > Discussion Top


Many treatment modalities are being tried to improve survival in unresectable locally advanced HNSCC. Docetaxel enhances the effect of radiation by synchronization of cell cycle at the most sensitive phase (G2/M) and influences intracellular platinum metabolism. [22] Cisplatin enhances radiosensitivity by inhibition of radiation induced DNA repair. Gefitinib has a variety of mechanisms attributed to its activity. Preclinical studies showed a reduction of cisplatin dose when used along with gefitinib is acceptable without loss of anti-proliferative effects and reduced toxicity. [23],[24] We tried to incorporate these three active agents along with radiation therapy and assess toxicity and tolerability as this combination in naïve in Indian population.

Incidence of mucositis in level 4 was 66% (two out of three patients). Grade 4 pain was secondary to mucositis in one patient and required PEG tube insertion for nutritional support. There were grade 3 mucositis in four patients (66%) in level 3. Although most patients undergoing radiation experience mucositis, it was substantial with this combination, probably accentuated by the addition of docetaxel and gefitinib. Increased incidence of mucositis had been reported with weekly docetaxel, weekly docetaxel/cisplatin (71%) and 3 weekly docetaxel/cisplatin/5 FU (79%). [13],[25],[26] Our results were comparable to data reported in the literature. Skipping week 3 chemotherapy dose had resulted in better mucosal tolerability (grade 3-0%) in level 3A.

The doublet (docetaxel/cisplatin) and triplet (docetaxel/cisplatin/5 FU) along with radiation had been tested in various trials. Hematological toxicity was most commonly reported. [23],[24],[27],[28] In this study, the dose limiting toxicities were neutropenia (66%) in level 4. Hematological toxicities in level 3/3A were manageable.

Tyrosine kinase inhibitors (TKI) had shown a response rate of 4-10% in recurrent/metastatic HNSCC as a single agent. A phase II study examining the combination of radiotherapy and gefitinib in HNSCC reported 32% complete remission and 53% partial remission. [29] The combination of gefitinib with chemotherapy had been a subject of debate for a long time. Preclinical studies showed synergistic cytotoxicity between cisplatin and gefitinib. The addition of gefitinib to docetaxel alone did not increase cell kill. [30] The definitive role of TKIs with chemoradiation needs to be defined in randomized controlled clinical trials.

We used PEG tube for nutritional support during acute toxicity. Long term tube dependence should be studied in our patients as most of the trials using docetaxel based chemoradiation had reported chronic toxicity and dysphagia. The effect of prolongation of an overall treatment duration and loss of local control should be studied further. Late radiation toxicity in newer combination chemotherapy needs to be evaluated in future trials.


 > Conclusion Top


In this study, MTD of the weekly docetaxel is determined at 15 mg/m 2 along with weekly cisplatin (30 mg/m 2 ), daily gefitinib (250 mg) and conventional radiation therapy. This treatment is feasible although with manageable toxicity with modification of the regimen skipping week 3 cycle. Aggressive nutritional support must be planned prior to initiating docetaxel based chemoradiation protocols.

 
 > References Top

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    Figures

  [Figure 1], [Figure 2], [Figure 3], [Figure 4], [Figure 5], [Figure 6]
 
 
    Tables

  [Table 1], [Table 2], [Table 3]


This article has been cited by
1 Docetaxel/gefitinib
Reactions Weekly. 2014; 1488(1): 18
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