Two version of render setup: Vray and Scanline
Model has procedural modifiers: turbosmooth and displace which works at render time making model more detailed. Displace use "Cellular" procedure map.
Model no uses textures. Just materials with self-illumination and falloff procedural maps.
Cells are the separate objects and can be removed or replaced.
Hipoly *.obj of cancer and cells included.
https://www.cgtrader.com/3d-models/science/medical/cancer
https://ua.3dexport.com/3dmodel-cancer-static-hipoly-model-151251.htm
https://www.turbosquid.com/FullPreview/Index.cfm/ID/1166248