CXCL8 and chronic thromboembolic pulmonary hypertension: In our population of inoperable CTEPH patients, as compared to populations of previous studies, enrolling only operable or both operable and inoperable patients, we found similarly elevated levels of IL-6 and IL-8 but, unlike the other studies, we did not observe increased levels of hsCRP, IL-10, or MCP-1.