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Horizontal lines represent 95% CIs; diamonds represent summary estimates with corresponding 95% CIs. A. For ovarian cancer subgroup, I2 = 45.3%, P = 0.139. B. For ENT tumor subgroup, I2 = 0.0%, P = 0.986. C. For neuroblastoma subgroup, I2 = 0.0%, P = 0.802. D. For hematological malignancy subgroup, I2 = 0.0%, P = 0.845
