Sean Parker is an investor and a co-founder of Napster and early Facebook investor, has shown interest in biomarker-related investments. He has supported companies like Immunome, focusing on antibody development, and Inivata, known for its liquid biopsy technology. Parker has also invested in GRAIL, which aims for early cancer detection via blood tests. Notably, he established the Parker Institute for Cancer Immunotherapy, emphasizing biomarker research for personalized cancer treatments.