Fig. S1B shows the expression of the pair formed by the ITGB1:ITGA9 complex and the SPP1gene in patient MGH42; the ITGB1:ITGA9 complex should be expressed by cancer cells. However only 1 of the 2 members of the complex is highly expressed in the tumor cluster (ITGB1) while the expression of the other partner (ITGA9) is almost undetected. This evidence concerns the gene ITGB1 and cancer.