title: An early and rare second malignancy in a treated glioblastoma multiforme: is it radiation or temozolomide?
abstract: Glioblastoma Multiforme (GBM) is a high-grade brain tumour with the most dismal prognosis. There are very few reports on second malignancies occurring in GBM patients, as the survival has been short. Second malignancies have been reported after treatment of malignancies with radiation therapy and chemotherapy especially after 5 to 10 y of treatment. Here in, we present a very unique case where a patient succumbed to sinonasal carcinoma occurring one and half years after treatment of GBM. A 17-year-old boy was diagnosed to have GBM and underwent surgery followed by chemoradiation and adjuvant chemotherapy with Temozolamide. He presented with undifferentiated sinonasal carcinoma, in the sinonasal region outside the radiation field within two years of treatment. Here we discuss the histology and possible chances of it being a second malignancy.
authors.affiliation: PG Registrar, Department of Radiation Oncology, Christian Medical College , Vellore, India .
authors.forename: Shina
authors.initials: S
authors.lastname: Goyal
authors.affiliation: Associate Professor, Medical Physics, Department of Radiation Oncology, Christian Medical College , Vellore, India .
authors.forename: Rabi Raja
authors.initials: RR
authors.lastname: Singh
authors.affiliation: Associate Professor, Department of Radiation Oncology, Christian Medical College , Vellore, India .
authors.forename: Sasidharan
authors.initials: S
authors.lastname: Balukrishna
authors.affiliation: Assistant Professor, Department of Pathology, Christian Medical College , Vellore, India .
authors.forename: Mandeep
authors.initials: M
authors.lastname: Bindra
authors.affiliation: Professor, Department of Radiation Oncology, Christian Medical College , Vellore, India .
authors.forename: Selvamani
authors.initials: S
authors.lastname: Backianathan
keywords: Long term chemotherapy; Radiation induced cancer; Sinonasal undifferentiated carcinoma