Arena Pharmaceuticals'

(ARNA) - Get Report

shares were up following an announcement that the company is enrolling patients in trials involving its proposed obesity drug Lorcaserin. The trial is one of three phase III studies evaluating the safety and efficacy of the drug. Shares rose 1.1% to $11.58.

Strategene

( STGN) jumped following the release of the results from a Food and Drug Administration study on the quality control of genetic-testing microarrays.

"Stratagene's Universal Reference RNA was one of two high-quality reference standards selected as part of the

FDA's MicroArray Quality Control project," said Dr. Joseph Sorge, Stratagene's president and CEO. "These reference RNAs allow laboratories with many different microarray platforms to compare and share data in the global microarray community." Shares grew 10.9% to $4.78.

Humana

(HUM) - Get Report

rose after investment research firm Jefferies & Co. initiated coverage of the stock with a buy rating. Analyst Brian Wright also set a target price for the company's stock at $75. Shares were trading up 2.7% to $64.28.

Cell Therapeutics

(CTIC) - Get Report

said a U.S. District Court judge dismissed a shareholder complaint regarding the company's alleged breaches of its duties related to the cancer drug Xyotax. Shares rose 2.9% to $1.70.

Durect

(DRRX) - Get Report

advanced after it appointed Matthew Hogan as chief financial officer. Hogan has 10 years of experience as a CFO at Ciphergen Biosystems, Avocet Medical and Microcide Pharmaceuticals and was previously an investment banker at

Merrill Lynch

( MER). Durect's shares were up 2.7% to $3.86.

Medtronic

(MDT) - Get Report

dipped after the Food and Drug Administration posted a warning letter on its Web site on violations regarding the company's quality-control systems. Shares were lower by 20 cents, or 0.4%, to $46.65.

Also on the move were

Genzyme

( GENZ), down 20 cents to $65.03,

Gilead

(GILD) - Get Report

, off 22 cents to $63.23, and

Antigenics

(AGEN) - Get Report

, lower by 6 cents, or 3.7%, to $1.56.

Eli Lilly

(LLY) - Get Report

was up 1.4% to $55,

GlaxoSmithKline

(GSK) - Get Report

was gaining 1.6% to $56.13,

Questcor Pharmaceuticals

( QSC) was rising 6.8% to $1.72,

Immtech Pharmaceuticals

( IMM) was up 3.4% to $5.21, and

Abaxis

(ABAX) - Get Report

was climbing 1.3% to $22.80.