This is the first 3D proof of concept using wireless electrochemistry to grow conductive structures with cell spheroids and hence is an exciting addition to the existing literature. Whislt AC stimulation was not capable of growing MWs in the presence of cell spheroids, MW growth was successful when using 50 V (0.5 kV/cm) of DC applied to a single spheroid of approximately 800 µm in diameter. This shows future promise that we may utilise the above and similar electrochemical methods to grow conductive structures in vivo. As 3D cell spheroids are often used to model tumours, this suggests we may be able to grow MWs around tumours for the study of manipulating cancer preocesses. Further optimisation may allow for these conductive structures to be grown around tumour sites in vivo for enhancing tumour treating fields (TTFs) for cancer treatment.