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Humans are upgraded into Cybermen.

Depending on the species of Cybermen, some people are 'converted' into Cybermen by having certain bodily functions replaced by cybernetic equivalents while the brain is subject to 'adjustment' to conform to the Cybermen cause. Other species of Cybermen will 'upgrade' a person by removing the brain and placing it within a cybernetic suit filled with an endo-skeleton and artifical nervious system. One sub-species of Cybermen suggest that replacements can be made from stock 'parts' (see "Revenge of the Cybermen") but it is vague as to how much, if any, organic content is needed.