Fig. 1From: Thoracic injection of low-dose interleukin-2 as an adjuvant therapy improves the control of the malignant pleural effusions: a systematic review and meta-analysis base on Chinese patientsScreening and identification of included studies. a A total of 18 articles that met the inclusion criteria were included in meta-analysis, which were searched from the database of Medline/PubMed, EMBASE, Cochrance Library, Web of Science, Chinese Journal Full-text Database and Chinese Sci-Tech Journals Database. b, c Through a comprehensive analysis according to the Cochrane Handbook of Systematic Review, we found that except for a study that was low risk, the other studies did not have obvious biasesBack to article page