Evaluation of efficacy of Caphosol in prevention and alleviation of acute side effects in patients treated with radiotherapy for head and neck cancers

Introduction

Oral mucositis is a common side effect of the oral mucosa due to anticancer therapy, especially for head and neck cancer [1]. Chemotherapy is administered systemically, whereas radiation therapy affects a mucosal membrane locally. Post-irradiation mucositis typically manifests as erythema, swelling, atrophy and ulceration [2, 3]. Chemotherapy-induced mucositis usually develops within 4–7 days after initiation of treatment and lasts about 2 weeks. Radiation-induced mucositis typically begins at cumulative doses of about 10–15 Gy (about 10 days of treatment) and typically lasts for weeks after the treatment is completed. Severity of mucositis depends on many factors, related to therapy and patient characteristics such as the method of fractionation, the total dose, the treatment strategy, oral hygiene during the therapy, as well as individual genetic predispositions. The majority of patients treated for head and neck cancers or those receiving high-dose chemotherapy develop severe oral mucositis. Patients often complain of taste changes, difficulty in talking and swallowing, pain and oral dryness. Severe oral mucositis can lead to bacterial and fungal infection, difficulty with swallowing and decreased patient’s quality of life. Significant progress has been made in understanding the pathobiology of mucositis in the last decade. The biological model of mucositis due to anticancer therapy proposed by Sonis in 2004 presents that mechanism as a cascade of pro-inflammatory cytokines TNF-, IL-1, and IL-6 activated by free radicals. This pathobiological cascade is described in five phases: initiation, up-regulation with generation of messengers, signaling and amplification, ulceration with inflammation, and, finally healing [2]. The understanding of this molecular mechanism of radiation-induced mucositis has opened new possibilities for investigators to develop a proper strategy in prevention and treatment of mucositis. Management of oral mucositis has been the subject of many publication each year [4–6]. There are several products available for the prevention and treatment oral mucositis [7–9], but there are no gold standard strategies to prevent and treat oral mucositis. Based on a comprehensive systematic review of the literature, the Mucositis Study Group of the Multinational Association for Supportive Care in Cancer and the International Society of Oral Oncology (MASCC/ISOO) has developed clinical practice guidelines for the management of mucositis. The last guidelines were published in January and February 2013 in Supportive Care in Cancer [10–13]. That is why many new products and medicines are being investigated to tackle the problem of oral mucositis. Caphosol is a supersaturated solution of calcium phosphate. It is designed to moisten, lubricate and cleanse the mucosa, and replace key minerals (calcium and phosphate) which are involved in repairing and maintaining mucosal integrity. Calcium ions have an antiinflammatory function, lower the prostaglandin production and promote tissue regeneration. Phosphate ions can protect against infections and maintain an appropriate pH level. High concentrations of calcium and phosphate allow the ions to diffuse into intercellular epithelial spaces and permeate mucosal lesions.

Aim of the study

The aim of the study was to assess the efficacy of Caphosol in prevention and alleviation of acute side effects of irradiation in patients irradiated for head and neck cancer.

Material and methods

This study was performed in accordance with the global standards of the International Conference on Harmonization – Good Clinical Practices (ICH-GCP), the Council for International Organizations of Medical Sciences International Ethical Guidelines for Biomedical Research Involving Human Subjects (CIOMS, 2002), applicable local regulatory requirements and the ethical principles that have their origin in the Declaration of Helsinki. The study complies with all laws and regulations in Poland and has been carried out in a manner respectful of the local culture and consistent with legal statutes and regulations for the protection of human subjects. Patients with head and neck cancer referred for radiotherapy or radiochemotherapy with radical intent were included in this study. Caphosol was assessed in a non-blinded, matched clinical study. Caphosol was used as a mouthwash from the first day of irradiation throughout the whole course of the therapy and two weeks after the treatment was completed. Initially, the patients used it for the oral cavity and the throat 4 times a day. The frequency of application was increased up to 10 times a day depending on the severity of symptoms associated with mucositis. The severity of acute side effects such as mucositis, dysphagia and xerostomia was assessed by a radiation oncologist according to the European Organization for Research and Treatment of Cancer/Radiation Therapy Oncology Group (EORTC/RTOG) scale once a week during the therapy and one month after its completion. Other criteria taken into consideration were: dietary supplements, the use of non-steroid anti-inflammatory drugs (NSAIDs), opioids, mucolytic agents, and prolonged hospitalization. The subjective assessment of patient satisfaction was made by completing a questionnaire.

Material and statistical analysis

The total number of patients included in this study was 100. The patients were matched into two arms equal in diagnosis and treatment strategy (Tables 1 and 2). In the experimental arm patients received Caphosol and in the control arm standard treatment, which was recommended in the Head and Neck Cancer Department.
Severity of the selected acute side effects (measured according to the RTOG/EORTC scale) according to a developed algorithm was adopted as a criterion of assessment. The mean value based on all measurements was analyzed as a continuous variable. Other criteria such as dietary supplements, use of non-steroid anti-inflammatory drugs (NSAIDs) and opioids as well as the fact of prolonged hospitalization were analyzed as a percentage of answers. Standard descriptive statistics tools – frequency tables and contingency tables for bivariate data, as well as maximum and minimum values, mean value and standard deviation for continuous variables with normal distribution, or quartiles in the case of different distribution – were used for description of the material. Student’s t-test or the nonparametric Mann-Whitney test was used to test the significance of differences for continuous variables, depending on their distribution. Percentage values were compared using the 2 independence test. All comparisons were made at the statistical significance level  = 0.05. The estimated values were presented with the 95% confidence interval (CI).

Results

A statistically significant difference in mean severity of acute side effects between two matched groups was observed in: mucositis level in the CTV area, mucositis level in the escalated dose (boost) area, dysphagia and xerostomia (p < 0.001 for all reactions). In the group of patients receiving Caphosol the mucositis was less intense, both in the CTV and in the boost area. The fact of reduced severity of dysphagia in patients receiving Caphosol is an interesting observation. The difference is much greater than the effect of the reduction of mucositis level in the boost area. Thus, it can be concluded that despite severe mucositis the patients who used Caphosol were able to swallow. The mean values for the reactions and the mean differences with 95% CI are presented in Table 3 and illustrated in Figs. 1–4. Lower use of opioid analgesia in radiotherapy patients receiving Caphosol compared to those receiving standard treatment for oral mucositis was noted (p < 0.001) (Fig. 5). There was also a difference in the frequency of prolonged hospitalizations between these two groups of patients. In the experimental group patients did not have reduced prolonged hospitalization due to severe post-treatment mucositis (p < 0.001) (Fig. 6). There were no statistically significant differences in the use of dietary supplements, NSAIDs and mucolytic agents between the two groups. The results of subjective patient satisfaction with reduction of dryness and improvement of comfort in the oral cavity after Caphosol are presented in Fig. 7. The median for both assessments was higher than 50% (slight improvement) with statistical significance (p < 0.001) and was, together with 25% and 75% quartiles for dryness reduction and comfort improvement, 75% (58%, 92%) and 83% (75%, 100%), respectively, whereas the respective minimum and maximum borderline values were 40% and 100%, and 33% and 100%.

Discussion

All patients treated with radiation therapy alone or in combination with chemotherapy for the head and neck region develop mucositis in the oral cavity, which has a negative influence on overall treatment time and quality of life. The patients often require administration of narcotic analgesics, parenteral nutrition, and antibiotics. Severe mucositis may lead to prolonged or additional hospital stay and therapy interruptions [14].
There are several products available for the treatment of oral mucositis. Some of them prevent oral mucositis by their anti-inflammatory potential and protect the oral mucosa. Others help maintain oral hygiene, and moisten and lubricate the oral cavity. The efficacy of all of these products is not well established, and there is still no “gold standard” for oral mucositis prevention and treatment. Apart from the clinical efficacy, it is important to consider the potential reduction in healthcare costs (length of hospitalization, analgesia, and specialist care) that could be achieved by preventing or reducing the incidence and/or duration of severe oral mucositis, when cost-effectiveness has become a necessary aspect of health commissioning. Many publications and numerous single-centre observations of Caphosol efficacy have been published during the past few years. Recent British guidelines on prevention and treatment of oral mucositis prepared by a UK multidisciplinary expert group of cancer and palliative care specialists suggest the use of a Caphosol rinse 4–10 times a day from the first day of treatment [15]. Most studies concerning the use of Caphosol in prevention and treatment of oral mucositis had a single-center design and compared patients receiving Caphosol with a matched group or historic controls receiving standard therapy [16–18]. The majority of these studies reported a lower incidence and severity of oral mucositis in patients receiving high-dose chemotherapy due to hematology malignancies and radiotherapy [19]. Only a few studies investigating the efficacy of Caphosol in patients treated with radio- or radiochemotherapy for head and neck cancer have been published to date. In two studies no preventive effect of Caphosol in severity of mucositis in this group of patients was found [20, 21], but despite this observation 50% of patients reported reduction of oral mucositis related symptoms, which was correlated with pain, swallowing and eating. In the present study reduction of severity of irradiation-induced mucositis was observed in the experimental group of patients in the CTV (clinical target volume) area and in the boost volume (the volume receiving a higher dose per fraction) area in comparison to the control group, and the difference was significant (p < 0.001). In the boost volume the severity of mucositis was increased, but it was lower as compared to the control matched group. The fact of reducing severity of dysphagia in patients receiving Caphosol is a very interesting observation. The difference is higher than the effect of Caphosol in reduction of mucositis in the boost area. Thus, it can be concluded that despite severe mucositis the patients receiving Caphosol were able to swallow and could eat. This observation is very similar to the data mentioned above. The reduction of opioid use observed in the present study agrees well with data from other publications. Data from the few studies suggest that Caphosol is well tolerated. Patients using Caphosol from the first day of treatment reported higher satisfaction, lower incidence of subjective feeling of dry mouth, and improvement of comfort in the oral cavity. These data are very similar to observations from many different studies. The effect of Caphosol on duration of hospitalization also seems to be important [22]. It was found that none of the Caphosol-treated patients had oral mucositis-related hospitalization, compared with 19% in the control group. In the present study shorter time of hospitalization due to post-treatment mucositis was observed. This observation correlates with data published by Godfrey and Cuccurullo from 2010 [23]. The effect of Caphosol on duration of hospitalization and opioid use may reduce the overall costs of treatment. The positive effect of Caphosol on comfort in the oral cavity and reduction of mucous dryness, evident on the basis of the patients’ assessments, is also very important. Improved comfort in the oral cavity and reduced dryness of the oral mucous may have a positive influence on the patient’s quality of life.
Despite the small size of the analyzed patient population, the differences are statistically significant. Hence we can conclude that Caphosol plays an important role in prevention and alleviation of irradiation-induced mucositis.

The authors declare no conflict of interest.

References

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Address for correspondence

Dorota Kiprian
Comprehencive Cancer Center
Warsaw, Poland
Roentgena 5
02-781 Warsaw, Poland
e-mail: dkiprian@wp.pl

Submitted: 15.04.2014
Accepted: 14.01.2016