“…We identified a total of 42 publications [ 16 , 19 , 22 , 23 , 30 , 41 , 42 , 45 , 49 , 52 , 56 , 59 , 61 , 64 , 68 , 72 , 74 , 80 , 85 , 89 , 100 , 101 , 102 , 103 , 105 , 106 , 108 , 109 , 110 , 111 , 112 , 113 , 114 , 115 , 116 , 117 , 118 , 119 , 120 , 121 , 122 , 123 ] comparing cell response to chemotherapy and other interventions between 2D and 3D in vitro tumour models, using a variety of anticancer agents and taking into account any publications which involved more than one type of anticancer agents, yielding in total 85 separate findings, including 79 outcomes concerning chemotherapy agents, three involving radiotherapy, and a further five exploring natural compound agents such as orange-peel flavones. The definitions for drug response varied throughout the studies in terms of markers used and duration over which drug responses were measured.…”