Abstract
In locally advanced squamous cell carcinoma of the head and neck, adding three cycles of high-dose (100 mg/m2) cisplatin every three weeks to definitive or adjuvant radiotherapy can significantly improve locoregional control and survival. One of the major drawbacks is severe acute toxicity with about 40% of patients developing mucositis, up to one fourth suffering from dysphagia, and at least 20% having bone marrow suppression. Late toxicity has been under- and sometimes mis-reported and may even be responsible for an increase in non-cancer-related deaths in long-term survivors. Moreover, efficacy outcomes are still not satisfactory with 5-year overall survival rates ranging between 40% and 50%, excluding the growing minority of human papillomavirus-related oropharyngeal cancer cases with a markedly better prognosis. Consequently, alternative regimens have gained attention with the aim to reduce toxicity, improve adherence, and maintain adequate anti-tumour activity. Low-dose (usually 40 mg/m2) cisplatin given in weekly intervals emerged as the preferred alternative to the standard, high-dose regimen. But do we have enough evidence to support this approach and which patients might become suitable candidates? While the use of high-dose cisplatin is supported by the results of four large trials randomizing altogether 1539 patients between conventionally fractionated chemoradiation and radiotherapy alone, there are only three small, similarly designed but possibly biased studies favouring a weekly regimen. In addition, two other trials randomly assigning patients to receive either high-dose or low-dose cisplatin, provided evidence against routine administration of the latter schedule. Therefore, although weekly cisplatin may enhance short-term tolerance in terms of gastro-intestinal, hepatic, hearing, renal, and haematological side effects, it cannot be excluded that this improvement comes at the price of compromised survival with no benefit in late adverse events. We acknowledge that certain clinical scenarios, particularly in the presence of relative contraindications to high-dose cisplatin, may favour a less toxic cisplatin dose and/or administration schedule, among which the low-dose weekly regimen. In this respect, the ever-growing population of elderly patients is in particular benefitting from a careful decision, taking into account the pros and cons of such regimens.
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Keywords
- Head and neck cancer
- Chemoradiotherapy
- Cisplatin
- Overall survival
- Toxicity
- Compliance
- Evidence-based medicine
- Clinical practice recommendations
Introduction
Since 1990s, chemoradiotherapy has been fulfilling an important role in the management of locally (and/or regionally) advanced squamous cell carcinoma of the head and neck (LA-SCCHN). In laryngeal and hypopharyngeal cancers, the first-generation trials on organ preservation demonstrated that induction chemotherapy followed by radiotherapy could spare total laryngectomy in more than half of patients without jeopardizing overall survival [1, 2]. About a decade later, the second-generation trials compared different administration schedules of chemoradiotherapy, and the Radiation Therapy Oncology Group (RTOG) 91–11 study showed the highest yields of larynx preservation when chemotherapy and radiotherapy had been delivered concurrently [3, 4]. In the same period, the latter schedule emerged as a preferred alternative to radiotherapy alone in unresectable cases without distant metastases and after surgical removal of locoregionally advanced disease in the presence of close or positive margins or extracapsular spread [5,6,7]. Subsequently, the recommended standard-of-care regimen has consisted of normofractionated external beam radiotherapy (2 Gy once per day five times weekly) combined with three cycles of concurrent high-dose three-weekly cisplatin at a dose of 100 mg/m2, both in the definitive and adjuvant settings.
While the addition of concomitant systemic treatment to radiotherapy positively impacts on locoregional control and survival, albeit to a limited extent, at the same time it does increase acute and late adverse events. Approaches to deal with these shortcomings are focussing either on modifications in radiotherapy or chemotherapy or both. An important step forward has been the implementation of intensity-modulated radiotherapy (IMRT) techniques leading to a reduction of acute and in particular late treatment-related toxic effects [8, 9]. In parallel, many efforts have been undertaken to ameliorate chemotherapy, but they did not produce any further practice-changing results. Theoretically, adjustments in systemic treatment schedules and finetuning of exposition to anticancer agents can modulate acute toxicity, whereas the objective of new systemic drugs or drug combinations has been primarily to improve efficacy. In this respect, the success story of immune checkpoint inhibitors in the recurrent and/or metastatic setting sparked hopes for patients with LA-SCCHN who are currently being offered participation in several large-scale randomized trials, which are ongoing in many centres globally, as further addressed below.
In this work, we will focus on weekly low-dose cisplatin, as an alternative to the standard, high-dose regimen, given concurrently to definitive or adjuvant radiotherapy in LA-SCCHN in order to decipher whether this change in administration schedule can influence acute toxicity as hypothesized above and what effect it may have on survival parameters. We will explore the comparison between weekly and three-weekly cisplatin at different levels of evidence according to the European Society for Medical Oncology (ESMO) grading consensus system and conclude with practice-oriented recommendations (Fig. 10.1) [10].
High-Dose Three-Weekly Cisplatin
Its position as the current standard of care has been built on the results of four large phase III trials published between 2003 and 2004 [3, 5,6,7]. Additional supporting data were provided in one smaller randomized study from 2004 [11]. The total intention-to-treat population of all these five trials together, three of which were conducted in the definitive and two in the adjuvant settings, equalled 1763 patients. Comparing concurrent chemoradiotherapy with radiotherapy alone, significantly enhanced disease-free survival (or its analogous measure), locoregional control, and overall survival were observed in favour of high-dose three-weekly cisplatin, which on the other hand had neither a significant influence on the incidence of distant metastases nor on response rate. More recently, enrolling exclusively treatment-naive human papillomavirus (HPV)-positive oropharyngeal cancer cases, the role of this regimen has further been reinforced by two large phase III trials, RTOG 1016 and De-ESCALaTE, in which the comparator arm comprised bioradiation with single-agent cetuximab [12, 13]. Here again, high-dose three-weekly cisplatin unequivocally outperformed the latter arm in terms of locoregional control rate and survival. In addition, the De-ESCALaTE trial, including only low-risk oropharyngeal cancer cases (HPV-positive, smoking history of less than ten pack-years), found a significant decrease in distant metastasis after cisplatin treatment (3% versus 9%, p = 0.0092). Taken all seven trials together, the total intention-to-treat population reached up to almost 3000 patients (Table 10.1). Of note, contrastingly to the remaining studies, the RTOG 1016 study employed an accelerated radiotherapy technique with six fractions over five days weekly aiming at the standard total dose of 70 Gy. As a general rule, altered fractionation radiotherapy has been combined with only two cycles of concurrent high-dose cisplatin given its shorter overall duration.
The efficacy, toxicity, and compliance of three-weekly high-dose cisplatin were explored in three meta-analyses of aggregate data, separately evaluating chemoradiotherapy based on conventional and on altered fractionations in the definitive and post-operative settings [14, 15]. Among 31 prospective trials using conventionally fractionated radiotherapy, model-based estimates of 5-year overall survival were 39% and 51% in the definitive and adjuvant settings, respectively. Relative to radiotherapy alone, patients treated with the combined regimen experienced more grade III-IV acute toxicity. About 40% developed mucositis, up to one fourth difficulties with swallowing, and at least 20% bone marrow suppression. As a result, only about two thirds of them could receive all three planned cycles of high-dose cisplatin [14]. Due to a limited number of eligible trials with altered fractionation, the respective meta-analysis could be performed only in the definitive setting. The estimated 5-year overall survival increased to 57% and compliance with both cisplatin cycles was as high as 92%. Nevertheless, severe acute adverse events remained frequent: 40% mucositis and dysphagia and about one out of five patients suffered from hematotoxicity [15].
Data on late toxicity should be regarded with caution because their reporting is scarce and usually biased due to difficulties with long-term follow-up of study participants. Although published results did not confirm that adding cisplatin leads to a significant increment in late side effects when compared with radiotherapy alone, it is plausible to assume the opposite. Not only has late toxicity been associated with long-term exposure to circulating platinum, but also the worse survival of patients randomized to the concurrent chemoradiation arm in the RTOG 91–11 trial suggests an important contribution of systemic treatment to late treatment-related morbidity [16, 17]. In this respect, it is of interest to consider the role of radiotherapy technique, especially IMRT as alluded to above. In fact, the majority of studies employed conventional two-dimensional or three-dimensional conformal planning, which has been gradually replaced by IMRT since its introduction in clinical protocols about 15 years ago. In the aforementioned meta-analyses, only six out of 38 chemoradiotherapy trials with high-dose cisplatin used IMRT but never as an exclusive method [14, 15].
Finally, it is informative to balance the results obtained from the meta-analyses of studies on high-dose cisplatin in the definitive setting that opened for accrual between 1981 and 2011 and those obtained from the two most recent phase III trials, De-ESCALaTE and RTOG 1016, which recruited patients from 2011 to 2016 (Table 10.2). Compliance to normofractionated radiotherapy was better in the De-ESCALaTE study than observed in the meta-analysis, which partly could be attributed to the use of IMRT. Surprisingly, a much lower percentage of patients in De-ESCALate received all planned cisplatin cycles, which is more difficult to explain. Patient factors (demographics), treatment factors (hydration schema, anti-emetic regimen), and physician factors (motivation based on literature data [18]) all might have played a role in this. Despite the lower exposition to cisplatin, overall survival was excellent with a 2-year estimate of 97.5%. Otherwise, interpretation of toxicity in De-ESCALaTE is hampered by incomplete data reporting and substitution of grade III-IV acute toxicity for serious adverse events [13, 14]. Concerning altered fractionation, probably owing to a smaller target dose of cisplatin, compliance and severe acute side effects were comparable between RTOG 1016 and the older trials included in the meta-analysis on altered fractionation schedules using the high-dose cisplatin regimen. The lower overall prevalence of severe late toxicity in RTOG 1016 than in the meta-analysis may pertain to the use of IMRT in this study. This could have also contributed, along with superior prognosis of HPV-positive oropharyngeal cancer patients, to the unprecedented 5-year overall survival of 85% relative to the other phase III trials [12, 15].
Low-Dose Weekly Cisplatin
Low-dose weekly cisplatin regimens have gained attention primarily in an attempt to improve treatment tolerance by decreasing acute side effects. Here, we will show that the supporting evidence for these schedules is considerably weaker than what we have for the high-dose cisplatin regimen, mainly with respect to efficacy and late toxicity. This does not necessarily mean that a low-dose regimen is inferior, but more data are needed to substantiate the arguments. First, the mere definition remains elusive. It is generally accepted that weekly cisplatin should be given once per week during the course of radiotherapy but due to local variations in radiotherapy protocols, the number of administrations varies between six and seven and may be further perturbated by unpredictable factors sometimes producing space for an additional eighth cycle. Ranging usually between 20 and 50 mg/m2, an even greater dilemma arises when choosing the individual cisplatin dose [19]. Consequently, the concept of cumulative dose has been introduced as a possible solution to this conundrum. Retrospective evidence suggests that the overall survival benefit observed in several clinical trials was driven by patients who received a cumulative dose of at least 200 mg/m2 and this particularly if they had HPV-positive cancer of the oropharynx [13, 18, 20, 21]. Although this hypothesis has never been confirmed prospectively, its adaptation in clinical practice can be useful in situations when the risk of serious toxic complications escalates near the end of treatment [22]. In fact, it remains unknown whether pushing the total dose beyond 200 mg/m2 adds an additional advantage in overall survival or whether this benefit, reported recently in the literature, merely reflects a process of selecting patients with better health status who in general have a better prognosis and are able to tolerate quantitatively more chemotherapy [23]. In this respect it is intriguing to note that in De-ESCALaTE, patients who received all three cycles of 100 mg/m2 cisplatin did not experience more toxicity events than the total population, and grade III-V late adverse events even seemed to be less common [13].
Analogously to high-dose cisplatin, the low-dose regimen underwent prospective evaluation versus radiotherapy alone in four trials randomly assigning a total of 834 patients [24,25,26,27,28]. When looking at Table 10.3 summarizing these studies, the first thing to notice is a seemingly positive correlation between the cumulative dose of cisplatin and the efficacy of weekly regimens. Exploring seven weekly doses of 20 mg/m2, the largest and oldest study was published 24 years after the last patient had been accrued. The delay was probably due to the disappointing results which nonetheless contribute to our better understanding of cisplatin pharmacodynamics. In the chemoradiotherapy arm, overall survival was numerically lower and both acute and late toxicity significantly higher than in the comparator arm [24]. A benefit in overall survival was seen only in the two studies in which the majority of patients received a cumulative dose of at least 200 mg/m2 cisplatin. They were reported by Sharma et al., who had chosen seven weekly doses of 40 mg/m2, and Bachaud et al. with seven to nine doses of 50 mg/m2 [26,27,28]. Of note, the last study, by Ghosh-Laskar et al. (seven to eight doses of 30 mg/m2), had to be prematurely closed because of poor accrual. Despite the initial plan to administer at least 210 mg/m2, the median cumulative dose of cisplatin was only 180 mg/m2, and this fell short of translating the significant yields in disease-free survival and locoregional control into a meaningful gain in overall survival [25]. Taken the four studies together, the addition of weekly cisplatin increased the frequency and severity of acute adverse events with less pronounced impact on late toxicity, the latter of which reached statistical significance only in the first study reported by Quon et al. and was not reported in the study by Sharma et al. [24, 26].
To further report on the outcomes of Iow-dose cisplatin, we will refer to the previously mentioned meta-analyses. They were conceptualized to compare the standard, high-dose three-weekly cisplatin with a weekly regimen complying with the vaguely defined dose and frequency criteria. Altogether, 38 trials were included in the high-dose arms and 21 in the low-dose arms of the three meta-analyses performed separately in the definitive conventionally fractionated, adjuvant conventionally fractionated, and definitive altered fractionation chemoradiotherapy settings. By involving uncontrolled studies and selected arms of otherwise ineligible randomized trials, one of their major limitations was that the final populations they compared were not intended to be compared and differed thus qualitatively but also quantitatively. Nevertheless, they fill the gap because there are hardly any unbiased randomized trials comparing these two schedules [19]. The results pertaining to weekly cisplatin will be presented in the following paragraph in relation to what has already been stated about the three-weekly schedule.
High-Dose Three-Weekly Versus Low-Dose Weekly
Aiming at a comprehensive approach to the topic, we will provide a step-wise evaluation and a concise overview of available evidence divided into 5 levels according to the model adopted by ESMO (Fig. 10.1) [10].
Level V Evidence
The lowest level of evidence is based on expert opinions, cross-sectional studies, case reports, and case series. Consequently, the assumptions underpinning low-dose weekly cisplatin in comparison with the high-dose regimen include a better short- and long-term tolerance without jeopardizing outcome, improved compliance, timely dose adjustments, enhanced radiosensitization, reduced risk of radio-resistance, and lower costs due to outpatient administration [14]. Of them, those exploring efficacy, toxicity, and compliance were explored at higher levels of evidence and will be further discussed below. Radiobiological properties per se and logistical aspects have clinical relevance primarily if they influence patient outcomes, and they have not been studied separately in prospective cohorts. Cost-effectiveness issue have recently been gaining increasing attention, but data are mostly available for new medicines. Based on a small retrospective study of 62 patients, the incremental cost-effectiveness ratio (ICER) for the addition of three-weekly cisplatin to radiotherapy was calculated at $3303-per-quality-adjusted life year (QALY) [29]. An analysis of healthcare expenditures in the cisplatin arm of the De-ESCALaTE trial revealed total costs of £13,517 per patient at 24 months post-treatment [30]. Unfortunately, similar analyses are neither available for a weekly regimen versus radiotherapy alone nor for a comparison between the two cisplatin schedules under question.
Level IV Evidence
Retrospective cohort and case-control studies provide a higher level of evidence but are still difficult to pool. As summarized in one of our publications, the results of such studies comparing weekly versus three-weekly cisplatin are conflicting and do not allow us to make firm conclusions, albeit that an overall impression of their outcomes tends to endorse the high-dose regimen [14].
Level III Evidence
Moving on to non-randomized prospective trials we present here the key results of the set of three meta-analyses mentioned above [14, 15]. In the adjuvant setting of conventionally fractionated chemoradiotherapy, data from nine trials could be retrieved, six on high-dose and three on low-dose cisplatin. While no differences in late toxicity (p = 0.5938) and compliance (p = 0.5747) were observed, severe acute toxicity favoured the weekly schedule with significantly less dysphagia (p = 0.0026) and weight loss (p < 0.0001). However, the latter findings should be interpreted with caution as they are based on only one trial using weekly cisplatin. In the definitive setting of conventionally fractionated chemoradiotherapy, 39 studies were included in the analysis, 25 in the high-dose and 14 in the low-dose cohort. There were clearly less severe acute toxicities with the weekly regimen as reflected by significantly less myelotoxicity (leukopenia: p = 0.0083; neutropenia: p = 0.0024), nausea and/or vomiting (p < 0.0001), and severe nephrotoxicity (p = 0.0099). In line with that, also the compliance was better with the weekly cisplatin regimen. No data on late toxicity were available in the low-dose cohort, precluding thus further calculations. The efficacy outcomes provided interesting insights into the role of the cumulative cisplatin dose. Although no difference in overall survival was noted in either of these meta-analyses, only about two thirds of patients in the high-dose arm could receive all three cisplatin cycles, i.e. a cumulative dose of 300 mg/m2. But what if the target dose was not 300 but 200 mg/m2. In that case, would it still be possible to ensure sufficient efficacy but with notably lower acute toxicity?
As alluded to above, 200 mg/m2 might indeed provide an adequate exposition to the drug. Moreover, this is exactly the target cumulative dose used in the third meta-analysis run in the definitive setting of altered fractionation chemoradiotherapy that involved 11 studies, seven with high-dose and four with low-dose cisplatin. Here, two cycles of the former regimen generated significantly less severe acute toxicity (mucositis and/or stomatitis: p = 0.0202, constipation: p = 0.0066) and short-term mortality (toxic deaths: p = 0.0168, 30-day mortality: p = 0.0154), but also less severe late adverse events (subcutaneous fibrosis: p < 0.0001) than observed with the low-dose cisplatin regimen. In line with an improved compliance (p = 0.0353), the vast majority of patients (95%) receiving the high-dose regimen could receive both planned cycles. Finally, patients on high-dose cisplatin during altered fractionation radiotherapy lived longer than those receiving the weekly regimen during altered fractionation radiotherapy (p = 0.0353). Albeit purely hypothetical, these results contribute to the ever-growing body of knowledge that supports a minimal cumulative dose of 200 mg/m2.
Level of Evidence II
Only two prospective trials randomly assigning LA-SCCHN patients to receive either the three-weekly high-dose or a weekly low-dose regimen have been published so far (Table 10.4) [31, 32]. Owing to an increased risk of bias arising from insufficient power and cumulative dose issues, we have assigned them to level of evidence II. The first study randomized 55 patients who were treated with the same mean radiotherapy and cisplatin doses (208.5 mg/m2 three-weekly versus 200.4 mg/m2 weekly) but a cumulative dose of at least 200 mg/m2 could be delivered to significantly more patients in the high-dose arm (88.5% versus 62.5%, p = 0.047). In spite of that, the low dose regimen proved to be more toxic (p = 0.02), particularly with regard to severe mucositis (38.5% versus 75.0%, p = 0.012). No differences in overall survival were noted at median follow-up of 12 months [31]. The accrual in the second randomized study reached up to 300 patients but concerns were raised about the different cumulative doses with 180–210 mg/m2 being the target exposure in the weekly cisplatin arm and 300 mg/m2 in the three-weekly arm. In the end, it was not that surprising to see the three-weekly regimen generating better locoregional control at 2 years (58.5% versus 73.1%, p = 0.014) but at the cost of an increment in severe acute toxicity (71.6% versus 84.6%, p = 0.006), namely vomiting, infection, hearing loss, hyponatremia, and myelotoxicity. Compliance and late toxicity were comparable [32].
Level of Evidence I
Current evidence has not attained this level, and the presented meta-analyses do not qualify because they were not primarily based on randomized trials exploring the respective comparison. The situation may be changing soon when the results of the phase II/III non-inferiority trial of the Japan Clinical Oncology Group (JCOG1008) are shared. Aiming to enrol 260 participants in the post-operative setting, the study has been ongoing since October 2016 with the primary objective of overall survival. The target cumulative doses were set to 300 mg/m2 and 280 mg/m2 for three-weekly and weekly cisplatin, respectively [33].
Immunotherapy Trials
After having defined new standards of care in the recurrent and/or metastatic setting, immune checkpoint inhibitors entered clinical trial design in LA-SCCHN challenging cisplatin-based chemoradiotherapy. In this respect, the majority of randomized trials are exploring immunotherapy on top of cisplatin by either intensifying definitive or adjuvant treatment (dubbed for our purposes design concept “A”) or by giving it right after the standard definitive or adjuvant chemoradiotherapy (design concept “B”). Alternatively, immunotherapy can replace cisplatin creating thus pure immunoradiotherapy regimens. In the former type of trials, high-dose three-weekly cisplatin represents the preferred administration mode.
The design model “A” has been adopted for example by the following larger (> 100 participants) trials: JAVELINE Head & Neck (NCT02952586), KEYNOTE-412 (NCT03040999), KEYCHAIN (NCT03383094), ADRISK (NCT03480672), and NIVOPOSTOP (NCT03576417). Here, sometimes preceded by a short lead-in phase with one dose of immunotherapy in eligible patients, chemoradiotherapy, as already mentioned, is typically based on the high-dose three-weekly cisplatin schedule (weekly regimen allowed in ADRISK) and combined with a programmed death-1 (PD-1) inhibitor (pembrolizumab or nivolumab) or an anti-PD-1 ligand (PD-L1) agent (avelumab or atezolizumab) in the experimental arm. Afterwards, patients are started on a maintenance phase with or without the immune checkpoint inhibitor for six to 12 months. The design model “B” stands for a classic two-arm concept where patients are assigned either to 1 year of immunotherapy or the same period of placebo or observation after having completed curative treatment as seen in IMvoke010 (NCT03452137) and EA3161 (NCT03811015). Other notable mentions comprise IMSTAR-HN (NCT03700905) and KEYNOTE-689 (NCT03765918) which are combining both design models. Finally, cisplatin-based chemoradiotherapy has been challenged by non-chemotherapy approaches in the NRG-HN005 (NCT03952585) and REACH (NCT02999087) trials.
Concluding Remarks and Outlooks for the Future
There are many drawbacks of high-dose cisplatin which is not by far the ideal solution to administer concurrently to curative radiotherapy. Particularly, toxicity has become an issue for many patients, sometimes with life-long consequences. And this is where a weekly regimen steps in with probably the greatest benefit in better short-term tolerance, such as less nausea, vomiting, transaminase elevations, ototoxicity, serum creatinine increase, and myelotoxicity. However, this might be offset by worse survival outcomes and no benefit in late toxicity. Three-weekly high-dose cisplatin should therefore remain the reference adjunct to radiotherapy with continuous efforts to find more efficacious and/or less toxic modalities. Unfortunately, weekly cisplatin has not convincingly met these requirements yet. Nevertheless, some clinical situation may indeed prioritize this approach.
Elderly people have often numerous comorbidities, impaired autonomy, decreased organ reserves, and a limited life expectancy. Geriatric assessment tools have been developed to help distinguish older patients who are fit and can be considered good candidates for standard treatment from those who are frail and should be directed towards palliative measures, but also from those who are in-between. Although the latter group, sometimes referred to as vulnerable, is typically excluded from registration trials, these patients may still be deemed suitable for curative therapy. Notwithstanding the lack of rigorous scientific data, weekly cisplatin is one of the regimens that can be offered to them providing a compromise solution with less acute side effects and still a possible benefit in overall survival [34]. A single dose of 40 mg/m2 can be pursued since the usual six to seven applications ensure an effective (≥ 200 mg/m2) and at the same time safe (≤ 300 mg/m2) cumulative dose. In addition, lowering the peak concentration of cisplatin, either by prolonging the infusion time or reducing cisplatin dose, can be recommended also in the presence of other relative contraindications as explained elsewhere [22].
More recently, the attention of healthcare professionals and researchers has been largely shifted towards immunotherapy which holds promise of being not only a more efficacious but mainly less toxic modality, offering thus new opportunities for frail patients as well [35]. In LA-SCCHN, several large trials are already ongoing and believed by many to become practice-changing, albeit only in high-income countries. In any case, the first results will not be available before 2021, and until then high-dose three-weekly cisplatin will retain its central position. But even later and in resource-limited regions, this schedule will not completely disappear from treatment protocols, and a choice between weekly and three-weekly cisplatin will maintain its significance for practicing physicians.
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Szturz, P., Vermorken, J.B. (2021). High-Dose Three-Weekly or Low-Dose Weekly Cisplatin during Radiation, What to Prefer?. In: Vermorken, J.B., Budach, V., Leemans, C.R., Machiels, JP., Nicolai, P., O’Sullivan, B. (eds) Critical Issues in Head and Neck Oncology. Springer, Cham. https://doi.org/10.1007/978-3-030-63234-2_10
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