TGFB1 and clear cell adenocarcinoma: The mRNAs of the pro‐angiogenic factors VEGFA, TGF‐β, and CCL2 were exclusively expressed in the KF28 serous carcinoma cell line compared with the RMG‐I clear cell carcinoma cell line (Figure 4A) suggesting that the angiogenesis dependency of the first and third serous PDX, which were sensitive to a lower concentration of CCR2i, was higher than that of the second clear cell PDX.