Express Scripts and Walgreens appear to have abandoned any pretense of trying to reach an end-of-the year resolution of their stalled contract talks. The negotiations, which began earlier this year but spun out last summer, have been a test of nerves and financial muscle by the two healthcare titans. The two corporate giants say they are miles apart on contract terms and prices. Their 3-year contract is set to expire on Saturday, Dec. 31. Still, analysts won't rule out a last-minute flurry of talks.