HPV-associated oropharyngeal Adenosquamous carcinoma with early metastatic disease detected by ctDNA.

Adenosquamous Carcinoma is a rare, aggresssive variant of squamous cell carcinoma that may HPV-driven in the oropharynx. Although it is reported to behave similar to HPV-related squamous cell carcinoma, the literature is very limited for this disease. We present a case of early T and N stage HPV + adenosquamous carcinoma of the tonsil that metastasized immediately following surgery and adjuvant therapy despite only having microscopic nodal burden. Circulating tumor DNA (ctDNA) was instrumental in recognizing and salvaging metastatic disease early with radiation.