“…Sixteen studies (20,34,35,38,39,55,56,70,(81)(82)(83)(84)(85)(86)(87)(88)) reported LS patients undergoing PCI (Figure 2C). The impact of PCI in improving survival vs patients who did not receive PCI was mixed, with some studies demonstrating an OS/progression-free survival (PFS) improvement [8 studies (20,34,35,38,39,83,85,86)], whilst others showing no improvement or a reduced OS [3 studies (82,84,88)]. However, all but one (88) studies that reported on the incidence of brain metastases found the addition of PCI led to a reduction in incidence [7 studies (20,34,35,39,81,87,89)].…”