Experimental: Induction chemotherapy in different subtypes of olfactory neuroblastoma

Induction chemotherapy based on pathological molecular subtypes of olfactory neuroblastoma.~① According to the immunohistochemical results of the pathological report, patients with Ki-67 index ≥ 25% were treated with two weeks of gemcitabine+platinum based chemotherapy regimen;~② According to the immunohistochemical results of the pathological report, patients with Ki-67 index \<25% were treated with a basic chemotherapy regimen of cyclophosphamide+etoposide+cisplatin (CEP regimen);~According to the progression of the patient's disease, the combination of other chemotherapy/small molecule drugs/targeted drugs can be considered;