Effect of the radioprotector WR2721 on irradiation-induced injury to ciliated cells of eustachian tube

Post-radiation middle ear effusion in NPC patients: Analysis of patient, tumour, and radiation factors

OBJECTIVE

The purpose of this study was to investigate whether patient, tumour and radiation therapy factors are associated with development of middle ear effusion (MEE) in nasopharyngeal carcinoma (NPC) patients.

DEIGN, SETTINGS, AND PARTICIPANTS

A retrospective review of NPC patients treated between January 2000 and June 2018 at Rabin Medical Center. Patient factors, tumour factors, radiation doses, and radiation fields were collected and outlined if needed (middle ear, eustachian tube [ET], tensor veli palatini [TVP], and levator palatini [LVP] muscles), then analysed and compared between patients with MEE and those without and between sides in patients with unilateral MEE.

MAIN OUTCOME MEASURES AND RESULTS

Seventy-three patients were enrolled. Most were males (71.2%) with advanced-stage diseases (78%). At the time of diagnosis 14 patients (19.2%) presented with MEE. Following radiation, 18 patients, with no evidence of MEE at presentation, developed MEE. Tumour stage, histology, and laterality were not associated with development of MEE. Comparison of mean radiation field dosages including-gross target volume, clinical target volume, and patient target volume showed no association with post-radiation MEE. In addition, no difference was found in the radiation doses to the middle ear, ET or the LVP nor the TVP between ears with and without MEE.

CONCLUSIONS

Post-irradiation MEE remains a common adverse effect in NPC patients. Surprisingly, tumour stage, tumour laterality, and histology were not associated with MEE. Similar findings were observed for total radiation doses and specific doses to the middle ear, ET, and ET muscles.

Nasal Cytology Changes in Head and Neck Cancer Treatment: A Systemic Review

Nasal cytology is a non-invasive, low-cost exam that can help physicians in the diagnosis of allergic and nonallergic rhinitis, discriminating between different nasal disorders. The aim of this review is to summarize and analyze the current knowledge about nasal cytological examination in head and neck cancer, with a specific focus on the effects of different treatments. Indeed, nasal cytology is important to choose the best treatment for nasal complaints in each patient. A review of the English literature (PubMed, Scopus, Cochrane) was performed (5404 records screened). The inclusion criteria were clinical trials, cohort studies, case-control studies, case series, and case reports regarding nasal cytology in head and neck cancer treatment. Exclusion criteria were as follows: non-human studies, non-English literature, non-cytological evaluations. Two independent reviewers, working separately, extracted the data from all the eligible studies, which were subsequently cross-checked. Five studies were included in qualitative synthesis: three assessed mucosal disorders after radiation therapy and two after total laryngectomy. Radiotherapy can determine mucous or squamous cell metaplasia and neutrophil inflammation. Laryngectomees show hyperplasia of the basal zone cells and mucous cell metaplasia, and they do not develop inflammatory changes. The main limitation of this review is the low number and heterogeneity of studies present in the literature. In conclusion, nasal cytology is useful and allows for identifying mucosal disorders of the nasal cavities after surgery and/or radiotherapy for head and neck cancer. This can help physicians to better treat the nasal complaints of such patients.

Effects of radiation on the temporal bone in patients with head and neck cancer

Radiotherapy is a key component in the treatment of many head and neck cancers, and its potential to cause long-term adverse effects has become increasingly recognized. In this review, we describe the short-term and long-term sequelae of radiation-associated changes in and injury to the temporal bone and its related structures. The pathophysiology of radiation-induced injury and its clinical entities, including sensorineural hearing loss, chronic otitis media, osteoradionecrosis, and radiation-associated malignancies, are described. We also discuss radiation dose to the head and neck as it relates to these conditions. An improved understanding of radiation's effects on the temporal bone will enable physicians and researchers to continue efforts to reduce radiotherapy-related sequelae and guide clinicians in diagnosing and treating the various otologic conditions that can arise in patients with head and neck cancer who have received radiotherapy. © 2016 Wiley Periodicals, Inc. Head Neck 38: 1428-1435, 2016.

Nasal cytological changes as late effects of radiotherapy for nasopharyngeal cancer

BACKGROUND

Radiation therapy is a cornerstone in nasopharyngeal cancer treatment. However, it can induce acute and long-term adverse effects, such as acute mucositis and late submucosal fibrosis. Late toxicities could not only affect submucosa but also mucosal cells, determining long-term cytological changes.

OBJECTIVE

Evaluation of delayed nasal cytological alterations in patients who underwent radiation therapy for nasopharyngeal carcinoma (NPC).

METHODS

In this case-control study, we analyzed 30 healthy subjects and 30 patients treated with chemotherapy and radiotherapy for NPC between 2003 and 2011, with a median follow-up of 59 months. All subjects underwent symptoms anamnestic evaluation (rhinorrea, nasal obstruction), endoscopic fiber optic nasal examination, skin-prick tests, and nasal scraping for cytological exam.

RESULTS

A higher percentage of rhinorrhea, nasal obstruction, mucosal hyperemia, and presence of nasopharyngeal secretions at fiber optic endoscopic exam was found in radiated subjects (p < 0.05). Nasal cytology analysis demonstrated a higher percentage of neutrophilic inflammation and squamous cell metaplasia and mucous cell metaplasia in treated patients (p < 0.05). No cytological atypia was seen. No statistically significant correlation between nasal cytological changes and objective findings, patients' age, tobacco smoking, and gastroesophageal reflux has been found in the radiotherapy group (p > 0.05).

CONCLUSION

Radiation therapy induces late nasal mucosal changes, which may be related to clinical consequences, such as abundant mucus production and its consequent endonasal stagnation. In the future, detailed knowledge of cytological changes in patients' nasal mucosa could represent a key prerequisite for the choice of effective interventions for late radiation-induced rhinitis.

The relationship between the protective effect of amifostine and decreased intercellular adhesion molecule 1 expression

PURPOSE

The objective of our study was to characterize the relationship between the protective effect of amifostine and decreased intercellular adhesion molecule 1 (ICAM-1) expression in early-phase, radiation-induced otitis media and to illustrate the possible mechanism of early-phase radiation-induced otitis media.

MATERIALS AND METHODS

A comparison study of middle ear tissue was performed by the expression of ICAM-1 and the electron microscope from total 38 guinea pigs. Group A, consisting of 2 pigs, was used as control, and these pigs were not irradiated. Groups B, C, D, and E, consisting of 9 pigs each, were irradiated. Sterile saline was administered intraperitoneally to the pigs in groups B and D before irradiation, and amifostine was administered intraperitoneally as an aqueous solution 30 minutes before irradiation to the pigs in groups C and E. The pigs in groups B and C were killed on the second day after irradiation, and the pigs in groups D and E were killed 30 days after irradiation.

RESULTS

Intercellular adhesion molecule 1 was strongly expressed in the middle ear mucosa of the irradiated pigs after a 45-Gy dose of radiation was administered. Enhanced ICAM-1 expression was accompanied by pathomorphologic changes in the middle ear tissue. Scanning electron microscopy demonstrated the changes. Intercellular adhesion molecule 1 expression in the mucosa of the groups killed on the second day was stronger than that in the mucosa of the groups killed 30 days after irradiation. Amifostine protected the middle ear from radiation injury, and we found that the expression of ICAM-1 in the middle ear mucosa was down-regulated. However, slight expression of ICAM-1 remained 30 days after irradiation.

CONCLUSIONS

Irradiation increased the expression of ICAM-1 in the middle ear mucosa. Amifostine protected the middle ear from early irradiation injury. There was a relationship between oxygen free radicals derived from irradiation and up-regulation of ICAM-1 expression. Continuous ICAM-1 expression might be related to stenosis of the eustachian tube.

Nasal and paranasal sinus changes after radiotherapy for nasopharyngeal carcinoma

OBJECTIVE

To study sinonasal side-effects after radiotherapy (RT) in nasopharyngeal carcinoma (NPC) patients.

MATERIAL AND METHODS

The study subjects comprised 32 cases of NPC (23 new cases, 9 old cases) who had been treated with RT with no recurrence. They were subjected to a saccharine test, nasal endoscopy and CT.

RESULTS

There was a gradual and persistent increase in the saccharine delay time after RT. Endoscopy showed that, early post-RT, edema and discharge were replaced by delayed crusting and adhesions. CT showed that the maxillary sinus, anterior ethmoid sinus and ostiomeatal complex were the areas most affected.

CONCLUSIONS

Rhinosinusitis is a common post-RT side-effect in NPC patients. A pre-RT saccharine test is a good predictor of those patients who are more likely to develop sinonasal side-effects. Functional endoscopic sinus surgery should be considered with caution in post-RT rhinosinusitis.

Amifostine in simultaneous radiochemotherapy of advanced head and neck cancer

The authors discuss the results of 3 studies of their group reflecting the possible role of amifostine in simultaneous radiochemotherapy (RCT) of advanced head and neck cancer. In a controlled phase II trial (1995 through 1996), 39 patients were included in this pilot investigation. A control group (n = 14) received simultaneous RCT of the head and neck region with an irradiation dose of 60 Gy and 2 cycles of carboplatin (700 mg/m(2) cumulative dose). Twenty-five patients received the same basic therapy and an additional 500-mg dose of amifostine before each chemotherapy. Amifostine was administered less than 45 minutes before the end of radiotherapy. The authors observed a dramatic reduction of typical radiotherapy-associated toxicities (mucositis, xerostomia, loss of taste, dysphagia). The hematologic side effects (leukocytopenia, anemia, thrombocytopenia) also were decreased significantly. The overall survival rate and locoregional control of both groups were comparable after 12 months. In a controlled intensification trial (1997 through 1999), the authors included 76 consecutive patients (69 men, 7 women) with pharyngeal cancer (oropharynx, n = 33; hypopharynx, n = 43). The tumors were characterized as unresectable and locally advanced without distant metastasis. All patients received a conventional radiotherapy (2-Gy single dose, daily fractionation) up to doses of 60 Gy and an additional 10 Gy as a boost in the tumor-infiltrated region. A dose of carboplatin, 70 mg/m(2), was given to a group of 45 patients on days 1 through 5 and 29 through 33 of radiotherapy (RCT arm). The resulting cumulative dose was 700 mg/m(2). A group of 31 patients (RCTintens arm) received the same dose of carboplatin on days 1 through 5, 22 through 26, and 43 through 47 or 1 through 5, 15 through 19, 29 through 33, and 43 through 47 of radiotherapy (cumulative dose 1.05 to 1.40 mg/m(2)). All patients received 500 mg of amifostine before each carboplatin administration. If the tumor volume was less than 20 cm(3), we observed an increased 1-year overall survival rate (91% v 71%) and time to progression (17 months v 10 months). If the tumor volume was greater than 20 cm(3), we observed comparable treatment results in both groups (1-year survival rate, 60% v 61%; time to progression, 13 months v 12 months). In a long-term follow-up investigation (1999 through 2000), 531 patients (89 women, 442 men) were analyzed according to their toxicities during regular follow-up investigations at our outpatient facility. All patients were treated by surgery or radio(chemo)therapy because of an advanced head and neck cancer. A total of 218 of 531 patients received the antineoplastic therapy without cytoprotection. An additional 313 patients received their RCT combined with amifostine administration before administration of the radiosensitizer. A significant influence of cytoprotection was registered in the following toxicities: xerostomia, fibrosis, loss of taste, and dysphagia. No impact was seen on the development of interstitial lymph edema and esophageal stenosis. Amifostine could be integrated in simultaneous radiochemotherapy of advanced head and neck cancer patients. The authors favor the administration of amifostine before chemotherapeutics alone. Selective cytoprotection could decrease the main acute toxicities (mucositis, xerostomia, dysphagia) as well as late side effects (xerostomia, loss of taste, fibrosis) of this form of combined treatment. The enhanced therapeutic index may be changed into a prognostic benefit for selected patients with unresectable tumors, if the volume is smaller than 20 cm(3).

Delayed irradiation effects on nasal epithelium in patients with nasopharyngeal carcinoma. An ultrastructural study

The ostiomeatal complex is responsible for the clearance of most sinus secretions. To evaluate the delayed effects of irradiation. this study examined the infundibulum mucosa of 10 patients who developed sinusitis after receiving radiotherapy for nasopharyngeal carcinoma (NPC). Pathologic findings under the light microscope revealed an increased deposition of dense collagenous fibers in the lamina propria. The epithelial cells also transformed into a stratified arrangement and showed gradual reduction of cytoplasmic volume. Ultrastructural observations detected areas of ciliary loss, intercellular and intracellular vacuolation, and ciliary dysmorphism. Most of these pathologic findings were observed even in a patient 23 years after irradiation. The results presented herein suggest that radiotherapy may cause long-term damage to the nasal epithelium that may be responsible for the prolonged sinusitis of irradiated NPC patients.