We present a parametric analysis of the absorption cross-section of small ellipsoidal composite structures (particles) with gold nanoparticles (GNP) embedded in lossy human tissue. The optimal permittivity of the ellipsoidal particle that maximizes the absorption at any given frequency, derived in our previous work with the surrounding tissue as a saline water, is used. We present new results for realistic tissue material parameters and for different GNP-host media and surrounding media. Present results are useful to assess the feasibility of the proposed radiotherapeutic hyperthermia-based methods to treat cancer, based on electrophoretic heating of gold nanoparticle suspensions using microwave radiation, as well as to improve the general understanding of plasmonic resonances in lossy media.