Wednesday's Health Winners & Losers

Health care stocks were up slightly Wednesday following successful drug studies, announced stock offerings and mixed earnings.

Advanced Life Sciences Holdings(ADLS Quote) announced that its respiratory antibiotic, Cethromycin, was shown to be effective in preventing inhalation anthrax infection in a 30-day study involving 30 primates. Shares rose 27 cents, or 7.9%, to $3.67.

Positive study results also sent Nabi Biopharmaceuticals (NABI Quote) soaring 90 cents, or 17%, to $6.03. The company said a significant number of patients in its phase IIb study for NicVax, a vaccine to treat nicotine addiction, met the primary endpoint of eight weeks of continuous abstinence. Nabi is also set to release first-quarter financial results by end-of-day Wednesday.

Planned stock offerings also moved the market Wednesday. Immunomedics(IMMU Quote) announced it will sell just over 4.8 million shares of common stock to institutional investors for about $24 million, or $4.95 a share. The stock closed at $5.35 Tuesday. The offering is set to close on or around May 7. Shares were up 4 cents, or 0.8%, to $5.39.

Array BioPharma's(ARRY Quote) offer to sell 7 million shares for $13 a share did not have the same impact on investors. The company's stock price fell 53 cents, or 3.9%, to $13. The Array BioPharma offering is also expected to close on or around May 7.

A narrowed quarter-over-quarter loss helped make Pozen(POZN Quote) a winner Wednesday. The pain reduction drug developer reported a net loss of $2.1 million, or 7 cents a share for the first quarter ended March 31, compared to a net loss of $6.4 million, or 22 cents a share for the same quarter last year. The results were good enough to beat the Thomson Financial consensus of a loss of 9 cents a share. Shares hiked 80 cents, or 5.5%, to $15.30.