2.2. Inclusion and Exclusion Criteria

Inclusion criteria are listed as follows: (1) pathological diagnosis of bone sarcoma; (2) studies assessing the association of NLR or PLR or LMR or their combinations with overall survival (OS), cancer-specific survival (CSS), or recurrence-free survival (RFS); (3) accessible hazard ratio (HR) and related 95% confidence interval (CI); (4) studies published in English; and (5) human studies. Exclusion criteria were as follows: (1) comments, reviews, case reports, conference abstracts, letters, and editorials; (2) studies containing subjects with soft tissue sarcomas; (3) studies with sample size smaller than 30; (4) overlapping or duplicate studies; (5) irrelevant studies; and (6) studies not in English.