CFH and neoplasm: In comparison with the effects of factor H silencing, no difference in tumor growth was seen when cells were inoculated into factor H‐deficient mice, demonstrating the cell‐intrinsic nature of this function of factor H. In addition, the function was cell‐type specific, with no effect of factor H knockdown in other cell types, also ruling out non‐specific off‐target effects of siRNA treatment.