This is an open-label, exploratory, biomarker study of intravenous temsirolimus given once weekly for 3 weeks to newly diagnosed, advanced stage head and neck cancer subjects prior to beginning their standard therapy for their specific disease. The primary objective of this study is to identify biomarkers of temsirolimus activity.

Inclusion Criteria:

• Subjects with newly diagnosed, advanced stage, head and neck squamous cell carcinoma of the oral cavity, oral pharynx, hypopharynx or larynx.
• Subjects willing to undergo tumor biopsies.
• Eastern Cooperative Oncology Group (ECOG) Performance Status of 0-1.
• Age >/= 18 years.

Exclusion Criteria:

• Subjects receiving anticoagulation therapy.
• Presence of unstable angina, recent myocardial infarction (within the previous 6 months), or use of ongoing maintenance therapy for life-threatening ventricular arrhythmia.
• Prior cancer therapy (chemotherapy, hormonal therapy, radiotherapy, immunotherapy) or investigational agent for their head and neck cancer.