There are a couple different "reputed" such spears. They all seem to have a connection to catholcism which should tell the discerning viewer something.
That church claims or has claimed at any given time to have such things as:

a. the bones of john the baptist
b. the hair of Jesus & John
c. the breast milk of mary
d. the blood of various "saints"

and a ton of other ridiculous things.

As for a "win for science" I would have to say that Christians (in the true sense) do NOT base their beliefs on relics, thats a catholic notion, and one that should be rejected.