Head and neck cancer is the sixth most common cancer and more than 650,000 new cases are diagnosed each year worldwide. About 60% of the HNSCC patients present with unresectable locally advanced disease at diagnosis and treated with multimodality approach. Despite such approach, majority (70%) of patients develop local or/and regional recurrences. Additional 10% of patients present with distant metastasis at diagnosis. Most patients with recurrent or metastatic disease are treated with single agent chemotherapy, combination chemotherapy or targeted therapies.