Epidemiology and Histopathology of Nasopharyngeal Neoplasms in Iran

Introduction

This study aimed to study the trend, histologic pattern, geographical distribution, and characteristics of nasopharyngeal carcinoma (NPC) and nasopharyngeal neoplasms (NPN) from 2003 to 2017 in Iran.

Materials and Methods

The Ministry of Health and Medical Education collected NPN cases from the corresponding university in each province and stored them in Iran National Cancer Registry (INCR) database. The Joinpoint program calculated the average annual percent change (AAPC) and its 95% confidence interval (CI). The jump model minimized the interfering effect of INCR transformation.

Results

3653 NPN cases were reported between 2003-2010 and 2014-2017, with a mean age of 49.04 ± 18.31 years and a male-to-female ratio of 2.15. The age-standardized incidence rate (ASIR) per 100,000 person-years was 0.30 for females and 0.68 for males in 2017. Although the ASIR/100,000 of NPN raised from 0.35 to 0.49 during 2003-2017, the trend was constant with an AAPC of -2% (95% CI: -4.8% to 0.9%). The age-specific incidence rate was highest in the older than 70 population (1.56/100,000). NPC formed 77.1% of NPNs and showed a constant pattern (AAPC CI: -5.7% to 0.2%), in contrast to the significant increase of non-keratinizing squamous cell carcinoma (AAPC CI: 2.3%to 24.5%).

Conclusions

Nasopharynx cancer is rare in Iran, and NPC incidence remained constant from 2003 to 2017, unlike previously reported rising trend. However, non-keratinizing squamous cell carcinoma exhibited a significant increase, and future studies are needed to examine the role of the Epstein-Barr virus on this growth rate.

What is the appropriate skin cleaning method for nasopharyngeal cancer radiotherapy patients? A randomized controlled trial

PURPOSE

To determine the effect of various cleaning methods for skin with acute radiation dermatitis (RD) in patients treated for nasopharyngeal carcinoma (NPC).

METHODS

A total of 168 NPC inpatients were randomized, while 152 patients completed the whole trial and the data were analyzed. Patients were randomly divided into the non-washing group (Group 1), washing with water alone group (Group 2), and washing with water and soap group (Group 3). All three groups received intensity-modulated radiation therapy (IMRT) with other treatments. Follow-up from recruitment or the initial radiotherapy dose to 1 month after the final radiotherapy dose. CONSORT checklist was applied as the reporting guidelines for this study. The study evaluated a range of endpoints, including incidence, timing, severity of acute RD, and quality of life (QOL).

RESULTS

There were no allergic reactions or aggravating in both washing groups during the whole treatment. The incidence of acute RD was 100% in all three groups, while the incidence of severe RD (grades 2-3) differed among groups (Group 1 vs. Group 2 vs. Group 3: 51% vs. 23.5% vs. 18%; P = 0.001), washing moderately reduced severity compared with patients without washing. Washing also delayed the onset time of acute RD; the incidence of acute RD was significantly lower than non-washing during the first 20 fractions (P < 0.001). What is more, washing reduced the incidence of moist desquamation (25.5% vs. 5.9% vs. 6%; P = 0.003) and helped relieve itching (6.49 ± 2.09 vs. 4.90 ± 1.90 vs. 4.00 ± 1.58; P < 0.001). There were no significant differences among groups with respect to pain or burning sensation. Washing improved QOL on physical (64.37 ± 4.08 vs. 67.41 ± 4.05 vs. 71.30 ± 4.87; P < 0.001), emotional (61.47 ± 4.75 vs. 65.75 ± 3.46 vs. 70.80 ± 3.27; P < 0.001), and social functional dimensions (62.64 ± 3.57 vs. 64.87 ± 3.88 vs. 68.04 ± 4.89; P < 0.001) at the end of radiotherapy, and the outcome was similar at 1 month after radiotherapy (P < 0.05). Washing with water and soap was the most effective way to reduce itching and improving QOL among the three groups (P < 0.05).

CONCLUSION

Washing irradiated skin reduces the occurrence and severity of acute radiation dermatitis.

CLINICAL TRIAL INFORMATION

ChiCTR2000038231, date of registration 09.18.2020.

What is the appropriate skin cleaning method for nasopharyngeal cancer radiotherapy patients? A randomized controlled trial

PURPOSE

To determine the effect of various cleaning methods for skin with acute radiation dermatitis (RD) in patients treated for nasopharyngeal carcinoma (NPC).

METHODS

A total of 168 NPC inpatients were randomized, while 152 patients completed the whole trial and the data were analyzed. Patients were randomly divided into the non-washing group (Group 1), washing with water alone group (Group 2), and washing with water and soap group (Group 3). All three groups received intensity-modulated radiation therapy (IMRT) with other treatments. Follow-up from recruitment or the initial radiotherapy dose to 1 month after the final radiotherapy dose. CONSORT checklist was applied as the reporting guidelines for this study. The study evaluated a range of endpoints, including incidence, timing, severity of acute RD, and quality of life (QOL).

RESULTS

There were no allergic reactions or aggravating in both washing groups during the whole treatment. The incidence of acute RD was 100% in all three groups, while the incidence of severe RD (grades 2-3) differed among groups (Group 1 vs. Group 2 vs. Group 3: 51% vs. 23.5% vs. 18%; P = 0.001), washing moderately reduced severity compared with patients without washing. Washing also delayed the onset time of acute RD; the incidence of acute RD was significantly lower than non-washing during the first 20 fractions (P < 0.001). What is more, washing reduced the incidence of moist desquamation (25.5% vs. 5.9% vs. 6%; P = 0.003) and helped relieve itching (6.49 ± 2.09 vs. 4.90 ± 1.90 vs. 4.00 ± 1.58; P < 0.001). There were no significant differences among groups with respect to pain or burning sensation. Washing improved QOL on physical (64.37 ± 4.08 vs. 67.41 ± 4.05 vs. 71.30 ± 4.87; P < 0.001), emotional (61.47 ± 4.75 vs. 65.75 ± 3.46 vs. 70.80 ± 3.27; P < 0.001), and social functional dimensions (62.64 ± 3.57 vs. 64.87 ± 3.88 vs. 68.04 ± 4.89; P < 0.001) at the end of radiotherapy, and the outcome was similar at 1 month after radiotherapy (P < 0.05). Washing with water and soap was the most effective way to reduce itching and improving QOL among the three groups (P < 0.05).

CONCLUSION

Washing irradiated skin reduces the occurrence and severity of acute radiation dermatitis.

CLINICAL TRIAL INFORMATION

ChiCTR2000038231, date of registration 09.18.2020.

Pretreatment Photopenia on 18F-Fluorodeoxyglucose Positron Emission Tomography-Computed Tomography Scans Predicts Poor Prognosis in Nasopharyngeal Cancer Patients Undergoing Concurrent Chemoradiotherapy

OBJECTIVES

To investigate the influence of pretreatment primary tumor or nodal photopenia (PP) on 18F-fluorodeoxyglucose positron emission tomography-computed tomography (FDG PET-CT), an indicator of tumor ischemia, on survival results of nasopharyngeal cancers (NPCs) treated with concurrent chemoradiotherapy (C-CRT).

METHODS

The pre-C-CRT FDG PET-CT scans of 104 patients with NPC (cT1-4 N0-3 M0) were retrospectively examined to determine the presence of PP (PP+). Our primary endpoint was the influence of PP+ on overall survival (OS), while the progression-free survival (PFS) and locoregional PFS (LRPFS) constituted the secondary endpoints.

RESULTS

The PP+ was detected in 29 (27.9%): nine (8.7%), seven (6.7%), and 13 (12.5%) in the primary tumor alone, primary tumor plus neck nodes, and neck nodes alone, respectively. Because the PP+ cases were small by count per location, all comparative analyses were performed according to overall PP+/ PP- status instead of per detected site. At a median follow-up of 67.8 months (range, 9 to 130 months), the median survival times were not reached (NR) for the entire population, while 5-year OS, LRPFS, and PFS rates were 73.3%, 68.2%, and 63.4%, respectively. Comparatively the PP+ patients exhibited significantly poorer median OS (49.8 months vs. NR, P<0.001), LRPFS (40.7 months vs. NR, P=0.001), and PFS (31.8 months vs. NR, P=0.002) durations than their PP- counterparts. Furthermore, the PP+ retained its independent prognostic significance in multivariate analysis (P<0.001).

CONCLUSION

Present results uncovered the pre-C-CRT PP as an independent predictor of poor prognosis for NPC patients, which underscore the requirement for the fortification of the local and systemic treatments in hypoxic NPCs.

Should adults with isolated serous otitis media be undergoing routine biopsies of the post-nasal space?

BACKGROUND

Serous otitis media is a recognised presentation of Eustachian tube dysfunction secondary to post-nasal space pathology. Post-nasal space biopsies are commonly taken in patients with isolated serous otitis media, despite normal nasendoscopy findings, without robust evidence for doing so. This study examined cases of unilateral serous otitis media with effusion in adults. It is the largest known retrospective study to investigate whether post-nasal space biopsies are indicated in non-endemic regions.

METHODS

A retrospective analysis was performed of 119 patients who underwent post-nasal space biopsy because of isolated serous otitis media, in a tertiary referral centre, from 2007 to 2017. Endoscopic examination and final histological report findings were reviewed.

RESULTS

Of the 119 patients identified, 6 (5.0 per cent) were found to have abnormal histology. In all six cases, suspicious clinical findings had been noted on nasendoscopic examination prior to biopsy.

CONCLUSION

Suspicious findings pre-operatively predict sinister pathology. Biopsies are not recommended in cases of adult serous otitis media with normal nasendoscopy findings if no other risk factors exist. A UK-wide retrospective study or prospective study over the next 10 years will help provide the evidence necessary to support this guidance.

Over-expression of cyclo-oxygenase-2 predicts poor survival of patients with nasopharyngeal carcinoma: a meta-analysis

OBJECTIVES

The conclusive prognostic significance of cyclo-oxygenase-2 has been determined in various cancers but not in nasopharyngeal carcinoma. Therefore, this study aimed to evaluate the relationship of cyclo-oxygenase-2 expression with the survival outcome and treatment response of nasopharyngeal carcinoma patients via a systematic meta-analysis approach.

METHODS

A meta-analysis was conducted in compliance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses ('PRISMA') checklist. The primary clinical characteristics of patients, and hazard ratios with 95 per cent confidence intervals of overall survival data, were tabulated from eligible studies. The relationship of cyclo-oxygenase-2 expression with survival outcome (expressed as hazard ratio) and treatment response (expressed as odds ratio) in nasopharyngeal carcinoma patients was analysed, and explained with the aid of forest plot charts.

RESULTS AND CONCLUSION

The pooled hazard ratio for overall survival was 2.02 (95 per cent confidence interval = 1.65-2.47). This indicates that the over-expression of cyclo-oxygenase-2 is significantly associated with the poor survival of nasopharyngeal carcinoma patients. The pooled odds ratio of 0.98 (95 per cent confidence interval = 0.27-3.49) reveals that over-expression of cyclo-oxygenase-2 was not significantly related to the treatment outcome.

Nasopharyngeal Mantle Cell Lymphoma: An Extremely Rare Entity

Mantle cell lymphoma (MCL) is a rare, aggressive subtype of non-Hodgkin lymphoma with a poor prognosis and high recurrence rate. It seldom affects the Waldeyer's ring let alone the nasopharynx. Patients usually present at late stages of the disease leading to poor failure-free and overall survival rates. Intensive chemotherapy regimes and autologous stem cell transplantation have reported increased survival rates. We report a relapsed case of nasopharyngeal MCL, which previously occurred in the gastrointestinal tract. The patient had undergone a hemicolectomy for colon intussusception secondary to the intraluminal lymphoma mass. He was unable to complete the treatment regime for MCL due to the adverse side effects. Oropharyngeal mass was discovered during routine outpatient follow-up, which was confirmed as nasopharyngeal MCL. We discuss the prognosis, disease progression, and possible treatments.

Nasopharyngeal Salivary Gland Anlage Tumour: A rare cause of neonatal respiratory distress

A salivary gland anlage tumour (SGAT) is a very rare type of benign tumour that usually presents in early infancy with respiratory distress which is exacerbated upon feeding. We report a full-term male neonate who was referred to the Al Nahdha Hospital, Muscat, Oman, in 2015 with severe neonatal respiratory distress due to a nasopharyngeal obstruction immediately after birth. Computed tomography and magnetic resonance imaging revealed a well-circumscribed mass in the nasopharynx, without intracranial extension. Histopathological analysis of the lesion confirmed a diagnosis of SGAT. Following excision of the tumour, the postoperative period was uneventful. No recurrence was observed over the next two years. This case report highlights the importance of the early recognition of this extremely rare and potentially life-threatening, yet easily curable, condition.

Cervical lymph node metastasis in adenoid cystic carcinoma of the sinonasal tract, nasopharynx, lacrimal glands and external auditory canal: a collective international review

OBJECTIVE

To review reports of adenoid cystic carcinomas arising in the head and neck area outside of the major salivary glands, in order to enhance the care of patients with these unusual neoplasms.

METHODS

An international team of head and neck surgeons, pathologists, oncologists and radiation oncologists was assembled to explore the published experience and their own working experience of the diagnosis and treatment of adenoid cystic carcinomas arising in the vicinity of the sinonasal tract, nasopharynx, lacrimal glands and external auditory canal.

RESULTS

The behaviour of adenoid cystic carcinoma arising in head and neck sites exclusive of the major salivary glands parallels that of tumours with a similar histology arising in the major salivary glands - these are relentless, progressive tumours, associated with high rates of mortality. Of 774 patients reviewed, at least 41 (5.3 per cent) developed documented regional node metastases.

CONCLUSION

The relatively low overall incidence of nodal metastases in adenoid cystic carcinomas arising in the head and neck region outside of the major salivary glands suggests that routine elective regional lymph node dissection might not be indicated in most patients with these tumours.

MicroRNA-152 Targets Phosphatase and Tensin Homolog to Inhibit Apoptosis and Promote Cell Migration of Nasopharyngeal Carcinoma Cells

Background

Nasopharyngeal carcinoma (NPC) is a type of head and neck cancer with very high prevalence in southern China. Phosphatase and tensin homolog (PTEN), a tumor suppressor, was reported to be downregulated in NPC patients and correlated with pathological grade and clinical stage of NPC.

Material/Methods

Luciferase reporter assay, qPCR, and Western blot analysis were used to determine if PTEN is a target of miR-152. The function of miR-152 in cell apoptosis and cell proliferation was examined as well. Tissue samples from NPC patients were also analyzed for PTEN and miR-152 expressions.

Results

Reporter assay indicated miR-152 targets the 3′UTR of PTEN mRNA to inhibit PTEN expression. Transfection of the NPC-derived cell line with miR-152 mimic confirmed these findings. Overexpression of miRNA-152 inhibits apoptosis induced by Cisplatin in NPC cancer cells in vitro. Moreover, overexpression miR-152 also promotes NPC cancer cell invasion and proliferation. Samples from EBV-negative NPC patients demonstrated the down-regulated level of PTEN may be related with overexpression of miR-152.

Conclusions

The miR-152 targets PETN to inhibit cell apoptosis and promote cancer cell proliferation and migration in NPC development.

Pathologic Evaluation of Routine Nasopharynx Punch Biopsy in the Adult Population: Is It Really Necessary?

Objectives

To retrospectively evaluate the patients who underwent nasopharyngeal biopsy with imaging and biopsy results, who have or don’t have symptoms for nasopharyngeal pathology and to determine the ratio of the nasopharyngeal cancer cases and other pathologic conditions.

Methods

In this retrospective study, 983 patients who underwent endoscopic nasopharyngeal biopsy for symptomatic nasopharyngeal lesions were included. All pathological results, benign or malign was recorded and classified due to the patients’ presenting symptoms such as symptomatic for nasopharyngeal pathology or asymptomatic. Computed tomography (CT) or magnetic resonance imaging (MRI) reports were also recorded separately as group A for malignancy or group B for not malignancy.

Results

Forty-five (4.6%) of 983 biopsies were malignant. In this group, there is no statistically significant difference between symptomatic and asymptomatic group. For malignant pathologies, the sensitivity of MRI was found 88.2% and CT was 61.5%.

Conclusion

For early diagnosis of nasopharyngeal cancer, all patients admitted to Ear, Nose and Throat (ENT) referral clinics should be examined endoscopically irrespective of their complaints and suspicious cases should be investigated by imaging especially by MRI. If MRI report clearly indicates Thornwaldt cyst or reactive lymphoid hyperplasia and this result is compatible with endoscopic findings, biopsy may not be necessary. Apart from these cases, all suspected lesions should be biopsied.

Magnetic Resonance Imaging Findings in Childhood Period Nasopharynx Cancer

Background

Nasopharyngeal carcinoma is a rarely seen tumor in childhood. It is mostly detected late as the clinical features are similar to other childhood tumors which affect the nasopharynx and adenoidal hypertrophy. Therefore, the radiological features of childhood tumors of the nasopharynx must be well known. The aim of this study was to investigate the contribution of MR imaging features of childhood nasopharynx cancer.

Material/Methods

The study included 10 nasopharyngeal carcinoma patients under the age of 18 years who presented at hospital between February 2008 and March 2014 and who had tissue diagnosis and MRI of the nasopharynx region. The MRI scans were evaluated by two radiologists. Loco-regional spread, asymmetry, signal intensity of the tumors, and lymph nodes were evaluated.

Results

In all the patients there was a mass which narrowed the nasopharynx. In all cases, unilateral mastoid opacification was observed. In 9 cases (90%), parapharyngeal extension was found. In 8 cases (80%), the mass showed an extension into the nasal cavity or oropharynx. In 5 cases (50%), there was an involvement of the skull base. In 3 patients (30%), an extension to the masticator space and pterygopalatine fossa was found. There were enlarged cervical lymph nodes bilaterally in 10 cases (100%). In 4 cases (40%), a lateral retropharyngeal lymph node was detected.

Conclusions

Childhood nasopharyngeal cancers are often diagnosed at an advanced stage. MR imaging can be helpful in diagnosis and differential diagnosis of childhood nasopharynx cancer from other diseases of the nasopharynx.

Intracellular expression profile and clinical significance of the CCR9-CCL25 chemokine receptor complex in nasopharyngeal carcinoma

OBJECTIVES

This study aimed to investigate the association of C-C chemokine receptor type 9 (CCR9) and C-C motif chemokine 25 (CCL25) expression levels with clinical and tumour-node-metastasis stage in nasopharyngeal carcinoma.

METHODS

A total of 42 nasopharyngeal carcinoma patients (nasopharyngeal carcinoma group) and 18 patients with a normal nasopharynx (control group) were included in this study. Tissues were collected during surgery and medical examinations. The CCR9 and CCL25 messenger RNA and protein levels were measured using quantitative reverse transcription polymerase chain reaction, Western blotting and immunohistochemical analysis.

RESULTS

CCR9 and CCL25 messenger RNA and protein levels were significantly increased in the nasopharyngeal carcinoma group compared with the control group (p < 0.05). Both CCR9 and CCL25 messenger RNA and protein levels were significantly higher in advanced-stage nasopharyngeal carcinoma (stages III and IV) patients compared with early-stage nasopharyngeal carcinoma (stages I and II) patients (p < 0.05).

CONCLUSION

The extent of CCR9 and CCL25 upregulation in nasopharyngeal carcinoma correlates with the tumour-node-metastasis stage.

Interleukin-4 and interferon- γ levels in Epstein-Barr virus-associated infectious mononucleosis and nasopharyngeal carcinoma

BACKGROUND

Cytokines have been suggested to participate in the pathogenesis of infectious mononucleosis (IM) and nasopharyngeal carcinoma (NPC).

METHODS

Serum levels and gene expression of interleukin-4 (IL-4) and interferon-γ (IFN-γ) were assessed by immunologic and PCR assays, respectively in patients with Epstein-Barr virus (EBV)-associated IM and NPC and EBV nega-tive controls.

RESULTS

The serum levels of IFN- γ were elevated, but those of IL-4 were decreased in IM and NPC patients as compared with those of the control group (p < 0.05).

CONCLUSIONS

These results suggest that serum levels of IFN-γ may be predominant over those of IL-4 during the course of IM and NPC.

Multi-institutional comparison of intensity modulated radiation therapy (IMRT) planning strategies and planning results for nasopharyngeal cancer

The intensity-modulated radiation therapy (IMRT) planning strategies for nasopharyngeal cancer among Korean radiation oncology facilities were investigated. Five institutions with IMRT planning capacity using the same planning system were invited to participate in this study. The institutions were requested to produce the best plan possible for 2 cases that would deliver 70 Gy to the planning target volume of gross tumor (PTV1), 59.4 Gy to the PTV2, and 51.5 Gy to the PTV3 in which elective irradiation was required. The advised fractionation number was 33. The planning parameters, resultant dose distributions, and biological indices were compared. We found 2-3-fold variations in the volume of treatment targets. Similar degree of variation was found in the delineation of normal tissue. The physician-related factors in IMRT planning had more influence on the plan quality. The inhomogeneity index of PTV dose ranged from 4 to 49% in Case 1, and from 5 to 46% in Case 2. Variation in tumor control probabilities for the primary lesion and involved LNs was less marked. Normal tissue complication probabilities for parotid glands and skin showed marked variation. Results from this study suggest that greater efforts in providing training and continuing education in terms of IMRT planning parameters usually set by physician are necessary for the successful implementation of IMRT.