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Background: Sinonasal tumors are a rare group of neoplasms with limited data available regarding their treatment. Objectives: To estimate the 5 year outcomes and late adverse events of locally advanced sinonasal tumors treated with neoadjuvant therapy (NACT) followed by local therapy. Methods: Twenty-five patients with locally advanced esthesioneuroblastoma or sinonasal neuroendocrine tumors treated between August 2010 and August 2014 with NACT followed by local therapy were selected. The 5-year outcome and late adverse events (CTCAE version 4.02) were noted. Progression-free survival (PFS) and overall survival (OS) were estimated using the Kaplan–Meier method. COX regression analysis was used to identify factors impacting PFS and OS. Results: The median follow-up was 5.15 years. The 5-year PFS in the esthesioneuroblastoma cohort and in the sinonasal neuroendocrine carcinoma (SNEC) cohort was 63.5% (95% confidence interval [CI]: 28.9–84.7) and 34.6% (95% CI: 10.1–61.1), respectively (P = 0.1). The only factor impacting PFS on multivariate analysis was a response to NACT (P = 0.033). The 5-year OS in the esthesioneuroblastoma cohort and in the SNEC cohort was 91.7% (95% CI: 53.9–98.9) and 46.2% (95% CI: 19.2–69.6), respectively (P = 0.024). Any grade late adverse events were seen in 20 patients (80%). Metabolic late adverse events were seen in 19 patients (76%). Conclusion: NACT in advanced sinonasal cancers is associated with an improvement in 5-year outcomes. However, late side effects, especially metabolic, are seen in these patients and should be evaluated during follow-up.

Tumor-induced osteomalacia in the head and neck region remains a challenging diagnosis to manage. Literature pertaining to management and outcome details remains sparse. We describe two cohorts: cohort 1 included seven patients from a single center in Western India with tumors located in paranasal sinuses (n = 3), intracranial (n = 2) and maxilla (n = 2). The unique features from our series is the management of persistent disease with radiation therapy (n = 2) and peptide receptor radionuclide therapy (PRRT) (n = 1). Cohort two has 163 patients identified from 109 publications for system atic review. Paranasal sinuses, mandible, intracranial disease, maxilla and oral cavit y, in descending order, are reportedly common tumor sites. Within this cohort, mean age was 46 ± 14 years at presentation with 44.1% having local symptoms. Duration of symptoms varied from 1 to 240 months. Pre-surgery mean serum phosphorus was 1.4 ± 0. 4 mg/dL and median FGF-23 levels were 3.6 (IQR:1.8–6.8) times of normal upper limi t of normal. Majority (97.5%) were managed primarily with surgical excision; however, primary radiotherapy (n = 2) and surgery combined with radiotherapy (n = 2) were also reported. Twenty patients had persistent disease while nine patients had recurrence, more commonly noted with intracranial and oral cavity tumors. Surgery was the most common second mode of treatment employed succeeded by radiotherapy. Four patients had metastatic disease. The most common histopathological diagnosis reported is PMT mix ed connective tissue, while the newer terminology ‘PMT mixed epithelial and connectiv e tissue type’ has been described in 15 patients.