Adding a point to shortest path

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If there exists a set of n points in a 2D coordinate system and an n-dimensional vector V that describes the shortest path containing all the n points and a second set of n+1 points is created containing all the n points from the first set and another, arbitrary, point, can vector V be used to reduce the number of steps required to find an (n+1)-dimensional vector V' describing the shortest path in the second set? More precisely, must the V' be evaluated independently of V?

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As I know, this is the problem of the travelling salesman. If $\exists$ some easy (polynomial time) shortcut from the $n$-points problem to the $(n+1)$-points problem, then $\exists$ a polynomial time algorithm for the general problem. !!!