There are two alternative hypotheses in overlap statistics, either boundary association or boundary avoidance. Usually when you do overlap analysis, you look to information on 4 statistics OG, OH, OGH and OS. In this case, because we only randomized the local leukemia boundaries we will focus on 2: OG and OS.
Overlap results consist of histograms for each statistic and a summary table. The leukemia boundary is "G", overlap would have high values of OS and low values of OG. Low values of OS and high values of OG indicate spatial avoidance. You can see in the histograms and the table that there is no significant association between the local leukemia boundaries and the tce sites.
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