But the company said it had stopped testing an experimental cancer drug, R440.
But while some companies have stopped testing on animals, getting them to do so hasn't been easy.
Ms. Holmes said Theranos had stopped testing in that laboratory and took the approach of saying, "Let's rebuild this entire laboratory from scratch so that we can ensure it never happens again".
C4 Shares of Merck dropped $2.95, or 6.5percentt, after the drug maker announced that it had stopped testing MK-767, a potentially big-selling diabetes drug, because it caused malignant tumors in mice.
When Progenics Pharmaceuticals of Tarrytown, N.Y., announced in May 2000 that an affiliate of the National Cancer Institute had stopped testing the company's vaccine for preventing a relapse of melanoma, investors reacted with venom.
3/ Then read this perceptive piece by David Thomson from 2009 in which he says Seymour Hoffman had stopped testing himself and that: There is something uneasy in him (it seems to me), as if he has not been able to settle in his own mind the question of whether he is meant to be a spectacular, ever-changing support, or a real actor who can take over the emotional centre of a movie and dominate it.
The reality is, if at any point along this path, if we would have stopped testing, we would've been leaving something on the table.
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According to Russia's Federal aids Center, last year the number of H.I.V. infections actually fell by some twenty-five per cent, but that is partly because the central government has stopped supplying H.I.V.-test kits to Russian regions; many local governments simply can't afford to buy them, so fewer people are tested.
At least one company that received a letter, Sciona, has stopped offering its gene testing and related diet advice to residents of California and New York.
