CHEK2 and glioblastoma: For example, a cluster of diffuse large B‐cell lymphoma (DLBCL) cell lines and primary cells with constitutive expression of DDR pathway proteins (γH2AX and pCHK2) were sensitive to CHK1/CHK2 inhibitors [24], while primary glioblastoma cell lines with elevated levels of γH2AX were highly sensitive to the WEE1 inhibitor MK‐1775 [25].