Characteristics of included studies.

a: Mean or middle point of follow-up time. Abbreviations: ESCC: esophageal squamous cell carcinoma, CLL: chronic lymphocytic leukemia, NSCLC: non-small-cell lung cancer, HCC: hepatocellular carcinoma, ccRCC: clear cell renal cell carcinoma, MPN: myeloproliferative neoplasms, AML: acute myelocytic leukemia, NB: neuroblastoma, HNSCC: head and neck squamous cell carcinoma, qPCR: quantitative polymerase chain reaction, FISH: fluorescence in situ hybridization-based approach. Characteristics of included studies.