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Additional laboratory blood tests will be performed to look at cellular components (proteins, RNA and methylated DNA) from circulating cancer and endothelial cells to find biological signals (biomarkers) that may serve as evidence or predictors of study drug action on your cancer.
Explanation: "Circulating" here does not refer ONLY to the bloodstream; in fact, cancer is quite often spread via the lymphatic system, and circulating cells may also use this vector to move around (whether they are normal cells or cancerous ones). So I would try to avoid "blood".
I can find only one exact match to confirm the above term, but the following site is a keyword match on a research paper, which seems like a good place to start.