Theranos CEO Elizabeth Holmes. Jeff Chiu/AP Walgreens has filed a breach of contract lawsuit against Theranos, the embattled blood-testing startup.

The lawsuit was filed Tuesday in Delaware's district court. Details on Walgreen's complaint weren't immediately available because the suit was sealed by the court.

The Wall Street Journal is reporting that Walgreens is looking for $140 million in damages, claiming that Theranos misled Walgreens about how far along its blood-testing technology was when the original partnership was inked.



Walgreens, once Theranos' biggest partner, terminated its relationship with the company in June. It had operated Theranos Wellness Centers, where people could go have their blood tested in the company's stores.

In the past year, the company has faced questions about the accuracy of its finger-prick blood tests, been told by a government agency that one of its labs posed “immediate jeopardy” to patients, had its CEO Elizabeth Holmes get banned from the lab-testing industry for two years, and seen partnerships like the one with Walgreens fall through.

In October, Theranos shut down all of its lab operations, pivoting to focus solely on the company's miniLab technology. The pivot cut 340 positions and closed its Wellness Centers where blood tests were performed.

Walgreens declined to comment. Theranos posted a statement on its website, which says in part that it plans to "respond vigorously," to Walgreen's "unfounded allegations."

Theranos is also facing a lawsuit from one of its major investors and lawsuits filed by patients.