Compositions belonging to the system dicalcium silicate (Ca2SiO4 = C2S)–tricalcium phosphate (Ca3(PO4)2 = TCP)33 and 34 are promising candidates for preparing new ceramic bone implants. In this context, the objectives of this work were to fabricate novel ceramics in the sub-system 2CaOSiO2 (C2S)–7CaOP2O52SiO2 (A).35 The effect of the microstructure (porosity, grain size and phase composition), on the in vitro behavior of the new ceramics in a simulated body fluid and human adipose stem cells attachment and proliferation has been studied.