|Year : 2015 | Volume
| Issue : 5 | Page : 610-616
Concurrent cisplatin-based chemotherapy versus radiotherapy alone as adjuvant therapy for squamous cell carcinoma of the oral cavity bearing high-risk features
Anis Bandyopadhyay1, Surendranath Senapati2, Deepti Rani Samanta3, Sarthak Mohanty4, Prafulla Kumar Das5
1 Department of Radiotherapy, Medical College and Hospital, Kolkata, West Bengal, India
2 Department of Radiation Oncology, Acharya Harihar Regional Cancer Center, Cuttack, Odisha, India
3 Department of Medical Oncology, Acharya Harihar Regional Cancer Center, Cuttack, Odisha, India
4 Department of Radiation Oncology, Tata Memorial Hospital, Mumbai, Maharashtra, India
5 Department of Surgical Oncology, Acharya Harihar Regional Cancer Center, Cuttack, Odisha, India
|Date of Web Publication||9-Sep-2015|
Department of Radiotherapy, Medical College and Hospital, College Street, Kolkata, West Bengal, India.
Source of Support: Nil., Conflict of Interest: There are no conflicts of interest.
Background: To compare concurrent cisplatin-based chemoradiation in an adjuvant setting for high-risk squamous cell carcinoma of oral cavity terms of toxicity, local-regional control, and overall survival.
Materials and Methods: A total of 54 patients of postoperative squamous cell carcinoma of oral cavity with high-risk features were randomized into two groups; postoperative radiation (60 Gy/30#/6 weeks) or postoperative concurrent chemoradiation (60 Gy/30#/6 weeks with weekly concurrent cisplatin 50 mg) arms.
Results: Buccal mucosa was the most common sub site (44.4%) affected, followed by lower alveolus/alveolar ridge (37%) and most tumors (64.3%) were well-differentiated. About 67.3% of the patients completed their course of radiation within 6 weeks with only 69 patients receiving the scheduled 60 Gy of external beam radiation therapy dose. Only 6 patients out of 22 completed the 6 cycles of weekly chemotherapy with compliance decreasing most after 3 cycles. Mucositis and dysphagia were significantly higher in the chemoradiation arm. After a median follow-up of 47 months, the loco-regional control rate was 51.4% in the postoperative chemoradiation arm as compared to 35.56% in the postoperative radiation arm. The 5 years overall survival was 56.4% in postoperative chemoradiation arm as compared to 51.3% in the postoperative radiation only.
Conclusion: Postoperative concurrent chemoradiation with weekly cisplatin in high-risk oral cancer gave an advantage in the loco-regional control rate and overall survival at the end of 47 months, with significant increase in acute toxicities Grade III and Grade IV toxicities.
Keywords: Chemoradiation, oral cancer, postoperative
|How to cite this article:|
Bandyopadhyay A, Senapati S, Samanta DR, Mohanty S, Das PK. Concurrent cisplatin-based chemotherapy versus radiotherapy alone as adjuvant therapy for squamous cell carcinoma of the oral cavity bearing high-risk features. Clin Cancer Investig J 2015;4:610-6
|How to cite this URL:|
Bandyopadhyay A, Senapati S, Samanta DR, Mohanty S, Das PK. Concurrent cisplatin-based chemotherapy versus radiotherapy alone as adjuvant therapy for squamous cell carcinoma of the oral cavity bearing high-risk features. Clin Cancer Investig J [serial online] 2015 [cited 2021 Apr 20];4:610-6. Available from: https://www.ccij-online.org/text.asp?2015/4/5/610/164719
| Introduction|| |
Annually about 600,000 squamous cell carcinomas of head and neck are diagnosed worldwide. In India, it accounts for one-fourth of all male cancers, with the oral cavity being the most common site. Chewing betel quid and nonsmoke tobacco consumption along with smoking are the biggest risk factor for these cancers in the country. The majority (60%) of these patients clinically present with the locally advanced disease with surgery and/or radiotherapy (RT) being the mainstay of treatment. Locoregional recurrences and distant failure are frequent after surgery of Stage III or IV squamous cell carcinoma of the head and neck. Most multi-institutional trials, including patients treated with surgery followed RT for advanced head and neck squamous cell carcinoma yielded local-regional recurrence, distant metastasis, and 5-year survival rates of 30%, 25%, and 40%, respectively.
Various strategies have been proposed to improve the outcome among patients who have resectable, locally advanced squamous cell carcinoma of the head and neck with a high risk of recurrence or metastases. From late 1970s to the early 1990s, promising results emerged from the use of various combinations of postoperative chemotherapy and RT in randomized and nonrandomized studies.,, In 2004, two large studies, European Organization for Research and Treatment of Cancer (EORTC) trial 22931 and Radiation Therapy Oncology Group (RTOG) 9501/intergroup trial evaluated the role of concurrent cisplatin-based chemoradiation in an adjuvant setting for high-risk head and neck cancer. Both trials resulted in a substantial and significant increase in local, regional control and a short-term increase in survival with postoperative adjuvant chemo-RT in poor prognosis patients., However, there was no impact on the rate of distant metastases, which represented greater the 40% of the failures in both studies.
Oral cavity cancers in them are an aggressive subgroup with much worse outcomes with both radical (conventional or altered) and postoperative RT. Above studies which have demonstrated improved control with addition of concurrent chemotherapy in the form of cisplatin (weekly or 3 weekly) had a very small subset of patients of oral cancers and thus generalization of the overall effects on these smaller subset warrants caution. Moreover, the widely prevalent poor oral hygiene, malnutrition, tobacco chewing are added factors to be taken into consideration for feasibility of such an aggressive therapy. Thus, the study aims to evaluate the effect of cisplatin-based postoperative adjuvant concurrent chemoradiation as compared to postoperative radiation alone for squamous cell carcinoma of oral cavity alone regarding toxicity, compliance, and loco-regional control.
| Materials and Methods|| |
Patients of nonmetastatic oral cavity squamous cell carcinoma fulfilling the eligibility criteria were accrued for the longitudinal prospective nonrandomised cell carcinoma arising from the oral cavity, who underwent radical surgery with histopathological evidence of the disease and having high characteristics and did not receive any prior chemotherapy or RT. High-risk features described were any of the following: pT3 or pT4, more than two metastatic neck node, extracapsular extension (ECE), lymphovascular or perineural invasion and surgical positive margin. The other inclusion criteria were single lesion, age more than 20 but <70 years, hemoglobin level minimum 10 g/dl, minimum performance (Karnofsky Performance Score [KPS]) status of 70 and above, total leucocyte count minimum 4000, serum creatinine level <1.5 and serum urea level 40mg/dl. Patients fulfilling the above criteria were randomly allocated into chemoradiation or radiation only arm. Twenty six patients in the Arm A were treated with postoperative RT alone by Co-60 Machine, using conventional fractionation, dose 58–60 Gy over 6 and 28 patients with high-risk features received postoperative RT (58–60 Gy, conventional fractionation) along with weekly cisplatin (6 cycles) at the rate of 35–40 mg/m2, to be completed 2 h prior to the start of RT. Radiation was started after minimum 3 weeks postsurgery, but not beyond 6 weeks, using unilateral fields (single or antero-lateral wedge pair portals) for lateralized disease and bilateral portals for midline structures such as tongue and floor of mouth. All patients were evaluated by a postoperative computed tomography of the head and neck. Radiation was planned using the conventional simulator. The treatment portal included the primary site and the draining nodal region. All patients underwent selective/modified neck dissection. For pathological N0 disease, elective nodal irradiation was done up to level II, and for pN+ disease with the well lateralized primary disease, radiation portal included ipsilateral nodal station one level lower than the extent of the dissection. For midline disease with pN+ status, bilateral neck was included one level lower than the extent of the dissection. For pN+ disease in level III/IV levels I-V was included.
The patients were first evaluated postsurgery just before the start of radiation therapy, during each week of treatment and at the end for acute toxicity as per RTOG toxicity criteria, and for compliance, both for RT and chemotherapy. Routine hematological and biochemical parameters were monitored every week and at the end of the therapy. Care was taken not to discontinue radiation, due to acute toxicity, but limiting or delaying subsequent doses of chemotherapy. Cisplatin was postponed till the absolute neutrophil count reached ≥1000/cc and renal function normalized. Patients were followed up posttherapy first at 6 weeks, thereafter every 3 months till 2 years, thereafter every 6 months till 5 years for toxicity and loco-regional control. Loco-regional control was defined as the absence of any disease above the clavicle. The time period for loco-regional control rate was measured from the date of completion of postoperative adjuvant radiation therapy.
Pretreatment patient and tumor characteristics of the two groups were compared using frequency table with counts and percentages. Variability between the groups was determined using Student's t-test for numerical values and Chi-square test for categorical values. A confidence interval of 95% was taken for detecting a significant difference between groups. The prevalence of various risk factors treatment-related factors and acute toxicity were compared between the two groups. Compliance to chemotherapy was defined as the ability to receive at least five out of six planned weekly doses of cisplatin within the period of radiation. Compliance to RT was defined as the ability to complete the planned radiation dose within 6 weeks. The loco-regional recurrence rate/failure-free survival was calculated using Kaplan–Meier statistics and compared using log-rank test. A (post hoc) multivariate analyses of various cofactors was undertaken using cox's proportional hazard model.
| Results|| |
During the period of September 2006 to August 2008, 282 cases of oral cavity cases were treated with definitive surgery. Ninety-two of these had any of the high-risk features and were eligible for the study, of which three patients had associated comorbid conditions, and 12 patients received preoperative chemotherapy. Among the rest only 54 patients gave consent for the study and included in the analysis. The baseline characteristics of these 54 patients are enlisted in [Table 1]. The median age was 52 years. Buccal mucosa was the most common subsite (44.4%) affected, followed by lower alveolus/alveolar ridge (37%) and oral tongue (11.1%), and most tumors (64.3%) were of well differentiated. Most patients underwent wide excision along with adjacent bony resection (segmental/marginal mandibulectomy or maxillectomy) and flap repair with selective supra omohyoid neck dissection as the surgical procedure. The distribution of high risk features were comparable in both the Arms [Table 2]. Four patients in the chemoradiation arm started radiation after 6 weeks as compared to 6 patients in the radiation arms (3 in the intermediate and 3 in the high-risk group). 67.3% of the patients completed their course of radiation within 6 weeks and 29.6% had treatment break and delay due to toxicity with only 69 patients receiving the scheduled 60 Gy of external beam radiation therapy (EBRT) dose and 4 patients receiving <40 Gy. The median duration of treatment was 43 days in the chemoradiation arm and 42 days in the radiation arms. Only 6 patients out of 22 completed the 6 cycles of weekly chemotherapy, and 11/22 patients received at least 5 cycles of concurrent weekly cisplatin with compliance decreasing most after 3 cycles. Twenty-eight (52%) patients had pT3/pT4 disease, 17 (31.5%) had close or positive margins, 16 (29.6%) had >2 nodes, 9 (16.7%) had ECE, 10 and 11 patients had perineural and perivascular invasion, respectively [Table 2]. 57.7% in the chemoradiation arm (Arm A) and 71% of the radiation arm completed their course of radiation within 6 weeks (P = 0.39). Three patients in Arm A received of EBRT dose less than the scheduled 58–60 Gy. Only 9 patients out of 26 completed the 6 cycles of weekly chemotherapy.
Mucositis and dysphagia were the major dose-limiting toxicity in the both arms [Table 3], with significantly higher incidence Grade III or higher mucositis in the chemoradiation arm. Four patients in the chemoradiation arm as compared to two patients the radiation arm had Grade IV neutropenia, with one patient dying on the 4th week of chemoradiation due to febrile neutropenia. There were more incidence of severe dysphagia in the chemoradiation arm; 5 patients were put on nasogastric tube feeding during the course of the treatment, who had a weight loss of more than 10% during the course of radiation. Significantly higher incidence of nausea and vomiting in the chemoradiation arm was observed. Overall the incidence of severe adverse effects was significantly higher in the chemoradiation arm, which however, was well-managed, except for one patient having toxicity-related death.
After a median follow-up of 47 months, the loco-regional control rate was 51.4% in the postoperative chemoradiation arm as compared to 35.56% in the postoperative radiation arm (P = 0.39) [Figure 1]. During this period, 27 loco-regional recurrences were observed. Of the loco-regional failure majority (6/15) were in the supraclavicular fossa, with three cases failing at the host graft site and four within the primary radiation field. The rest failed above clavicle but outside the radiation field used. There was no difference in the pattern of failure between the treatment arms. Of the above 27 patients, eight patients in each group received salvage chemotherapy, platinum-based or taxane-based, 2 patient in the RT arm and 1 in the concurrent chemoradiation (CTRT) arm received reirradiation and 4 patients were salvaged surgically (3 in the CTRT arm and one in the RT arm). The rest received either oral tyrosine kinase inhibitors or metronomic chemotherapy based on their performance status as salvage therapy. The 5 years overall survival was 56.4% in postoperative chemoradiation arm as compared to 51.3% in the postoperative radiation only (P = 0.482, log-rank test) [Figure 2]. There were in total 22 recorded deaths during this period, 12 in the RT arm and 10 in the CTRT arm, of which death due to disease were in 18 cases, two patients died of cardiac causes, one due to renal failure and one patient committed suicide.
|Figure 1: Loco-regional recurrence free survival (P = 0.39, log-rank test)|
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|Figure 2: Five years overall survival comparison of the two treatment arms (P = 0.489, log-rank test)|
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On multivariate analysis, it was found that among various covariates presence of pathological positive nodal disease, suboptimal RT dose received, and positive margin status was associated with significant high hazard ratio [Table 4]. Other factors like age more than 50 years, Hb level <10 mg/dl, moderate and poorly differentiation of tumors, KPS <80, tumor size and presence perineural involvement, though had hazard ratio of more than one but this was not found to be statistically significant.
|Table 4: Multivariate (post hoc) analysis of factors for LR failure free survival|
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| Discussion|| |
The potential benefit of postoperative concurrent chemoradiation using cisplatin-based chemotherapy for head and neck cancer with poor prognosis was well established by the two large randomized trials published in 2004., Both trials resulted in a substantial and significant increase in local, regional control and short-term survival with postoperative adjuvant chemo-RT in poor prognosis patients although only the European trial proved to have significant and sustained increase in long-term survival. The fact that the eligibility criterion and the definition of high-risk factors were different in the two trials did not reflect in the results as both studies had similar outcomes, with the estimated increase in 5 years disease free survival from 36% to 47% in the EORCTC arm and 45% to 54% 3 years disease free survival in the RTOG arm with addition of cisplatin. This study consolidated the evidence supporting the use of concurrent chemoradiation in postoperative setting for oral cavity cancers, which constituted only a minor subgroup of the above two studies, associated mostly with chewing tobacco and betel nuts, with an absolute benefit of 16% in loco-regional control rate at 47 months median follow-up and a 13% advantage in 4 years overall survival, with manageable increase acute toxicity.
The categorization of pathologic risk factors of head and neck cancers was described by Peters et al. in the 1990s, who clarified which patients needed postoperative RT depending on the risk of recurrence. The presence of pathological two or more lymph nodes and/or ECE of tumor were independent variables linked to a significantly increased risk of recurrence in this study, and these were also taken as high-risk factors in the above two randomized trials. Combinations of two or more risk factors were associated with a progressively higher risk of local failure. For oral cancers, the simultaneous presence of three or more risk factors, which included additional risk factors such as degree of histologic differentiation, skin invasion, bone invasion, and invasion depth, was associated with severe prognosis. In another retrospective data of oral cancers of over 35 years poor loco-regional control was associated with positive margins, vascular invasion, perineural invasion, ECE, and T classification., In the present study, however, presence any of the risk factors was qualifiers for high risk since this criterion was validated in the larger two randomized trials.
In contrast to the EORTC and the RTOG trials, and other trials we used a weekly cisplatin schedule at the dose of 40 mg/m2 on the basis of the results of the trial reported by Bachaud et al.and the more favorable toxicity profile of the weekly cisplatin schedule compared to the 100 mg/m2 3 weekly schedule. Furthermore, this has enabled us to measure the compliance to concurrent chemotherapy since 6 weekly doses can be given instead of only two to three in the later schedule. The disadvantage of the combination of chemo and RT is the potential increase of acute and late radiation toxicity by the chemotherapy. Our study showed a higher overall severe acute toxic effect rate in the concurrent chemoradiation group than in the RT group as was observed by Bouchard et al. (41 vs. 18%). Mucositis, dysphagia, nausea, and vomiting were the most frequent adverse effects in both the groups; however, neutropenia was the only fatal toxicity in CCRT group. Barring one, all the patients eventually completed the scheduled RT, however only 27% (7/26) completed the full course of six cycles of chemotherapy; much in contrary to what was observed by earlier authors, Bouchard et al. and Porceddu et al. The possible explanation could be a combination of low nutritional status and low motivation of the patients in the study.
Though the median follow-up period of this study was short, there was definite increase (16%) in the loco-regional control rate at 47 months with addition of concurrent weekly cisplatin, in spite of the fact that only 50% of patients received at least 5 cycles of weekly cisplatin. This corroborates with earlier studies like Bouchard et al. and the EORTC and RTOG study. However, the 24 months LCR rate of 57.8% in the concomitant arm is much inferior to 73% observed by Porceddu et al, Smid et al 69% and the RTOG study (79%).,, There could be various possible explanations to this fact, first and foremost is that the present study included only oral cavity cancers, which are shown to have inferior loco-regional control rates. The other possible reasons include the greater rate of high-grade acute toxicity observed leading to lower compliance to chemotherapy. Also, the overall low nutritional status and probably the lack of prophylactic nutritional interventions like percutaneous endoscopic gastrostomy might have also contributed. This study has various strengths and limitations. This is probably one of the few studies, where the effect of concurrent chemoradiation in postoperative setting was tested for exclusively oral cavity cancers. There is very little clarity regarding the choice of adjuvant therapy according to histopathological risk factors for oral cavity cancers. A randomized control trial (The OCAT trial) is ongoing, and the results from the same would provide the required level I evidence to this end. Although a single institutional nonrandomized study, the present one has provided some vital clues. First it has validated the role of weekly cisplatin-based concurrent chemotherapy in the postoperative setup of this subset of head and neck cancers by demonstrating a significant improvement in loco-regional control. It also raises the question of proper scheduling of concurrent chemotherapy since only 27% actually completed the six scheduled cycles. The major limitation of this study is it that is a nonrandomized one. The sample size was also too small to allow for any subgroup analysis regarding the effect of various individual high-risk features on loco-regional control and progression-free survival. Another major drawback of this study was that all patients were treated using conventional planning using a conventional simulator, and no dose constraints were applied for organs at risks. This may have resulted in higher acute and late toxicities. However, with all its limitation this study produced comparable results in terms of loco-regional control rate and overall survival to previous studies [Table 5], there reemphasizing the benefit of use of concurrent cisplatin with RT for those selected group of patients with some clinical or pathological high risk features.
|Table 5: Comparison of studies using concurrent chemoradiation for head and neck squamous cell carcinomas in the postoperative settings|
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| Conclusion|| |
Postoperative concurrent chemo RT with weekly cisplatin for patients with high-risk oral cavity cancer gave an advantage in the loco-regional control rate at the end of 24 months, though there were significant higher toxicity and less compliance with this protocol as compared to postoperative RT only. A longer follow-up and a larger sample may be needed to assess the survival advantage provided by this intense schedule in high-risk oral cavity cancer in this part of the world.
There are no conflicts of interest.
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[Figure 1], [Figure 2]
[Table 1], [Table 2], [Table 3], [Table 4], [Table 5]
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