The route part of a FPL should begin with the endpoint of the SID (or airway from there) and end with the first point of the STAR. It's not necessary to insert a DCT, but some operators seem to, particularly if unfamiliar with the rather exacting European IFPS. As 055166k says, just because you see DCT on the FPL, it doesn't mean that the SID/STAR will not be flown.
It's also worth noting that if you put "SID" or "STAR" on the FPL IFPS will only put the relevant SID/STAR in the final FPL message if there is only one option available. If not (e.g most UK arrivals / departures) then it will put DCT by default.