Figure 3.

Pie chart showing proportion of cell studies included after applying quality control criteria and reasons for exclusion in our study of milk-IGF-prostate cancer.

Figure 3 shows that our search identified 74 papers of cell studies relevant to milk-IGF-prostate cancer the research question; of these, 59 were excluded because they did not use authenticated cell lines (n=28); carried out experiments in only one authenticated cell line (n=26); or did not validate results in more than 3 repeat experiments (n=5).