Breast cancer is the most common malignancy and the leading cause of cancer related death in women of the western world. For most women, increasing age is the primary risk factor for breast... Show more Breast cancer is the most common malignancy and the leading cause of cancer related death in women of the western world. For most women, increasing age is the primary risk factor for breast cancer. Therefore, the number of breast cancer patients is expected to further increase in the coming years. The work presented in this thesis is part of the collaborative FOCUS project, seeking insight into breast cancer disease (in the elderly), aiming to define normal tissue, breast cancer, and therapeutic sensitivity differences in observational, population-based cohorts consisting of elderly breast cancer patients. Topics discussed in this thesis are differences and clinical value of molecular differentiation, immune evasion, proliferative and apoptotic signaling; but also the predictive value of IGF1R and HER2 expression on the breast tumors. Last but not least, we discuss the effects of aging on tumorgenesis and the road to precision medicine. Only when all medical specialties bound to the care and cure of older cancer patients join forces, known as a multidisciplinary oncogeriatric battlefront, treatment goals, and implementation hereof will be achieved. Show less
Engels, C.C.; Kiderlen, M.; Bastiaannet, E.; Eijk, R. van; Mooyaart, A.; Smit, V.T.H.B.M.; ... ; Liefers, G.J. 2016
Adhesion G protein-coupled receptors (ADGRs) are believed to be activated by auto-proteolytic cleavage of their very large extracellular N-terminal domains normally acting as a negative regulator... Show moreAdhesion G protein-coupled receptors (ADGRs) are believed to be activated by auto-proteolytic cleavage of their very large extracellular N-terminal domains normally acting as a negative regulator of the intrinsically constitutively active seven transmembrane domain. ADGRG2 (or GPR64) which originally was described to be expressed in the epididymis and studied for its potential role in male fertility, is highly up-regulated in a number of carcinomas, including breast cancer. Here, we demonstrate that ADGRG2 is a functional receptor, which in transfected HEK293 cells signals with constitutive activity through the adhesion- and migration-related transcription factors serum response element (SRE) and nuclear factor kappa-light-chain-enhancer of activated B cells (NFκB) presumably via coupling to Gα12/13 and Gαq. However, activation of these two pathways appears to occur through distinct molecular activation mechanisms as auto-proteolytic cleavage is essential for SRE activation but not required for NFκB signaling. The overall activation mechanism for ADGRG2 is clearly distinct from the established ADGR activation mechanism as it requires the large extracellular N-terminal domain for proper intracellular signal transduction. Knockdown of ADGRG2 by siRNA in the highly motile breast cancer cell lines Hs578T and MDA-MB-231 resulted in a strong reduction in cell adhesion and subsequent cell migration which was associated with a selective reduction in RelB, an NFκB family member. It is concluded that the adhesion GPCR ADGRG2 is critically involved in the adhesion and migration of certain breast cancer cells through mechanisms including a non-canonical NFkB pathway and that ADGRG2 could be a target for treatment of certain types of cancer. Show less
Bulten, B.F.; Verberne, H.J.; Bellersen, L.; Oyen, W.J.G.; Sabate-Llobera, A.; Mavinkurve-Groothuis, A.M.C.; ... ; Geus-Oei, L.F. de 2015
