On a trading day that saw the S&P 500 gain 0.1%, the Health Care sector (XLV) showed little change.

As a proxy for the sector, the ETF tracked closer to the overall market today than over the past month. As trading began today, XLV was up 2.4% over the last thirty trading days, and the S&P 500 climbed 4.8%.

Genomic Health (GHDX) was a major gainer in the sector, rising 15.6% (+$4.89) to close at $36.22 with 746,675 shares moving. The stock traded in a range of $32.06 to $36.43. Shares price has risen $4.99 (16%) from $31.23 on August 2, 2012. Amarin Corporation plc (AMRN) was another big mover, climbing $1.57 (+13.9%) to a closing price of $12.91.

ChemoCentryx (CCXI) was a major loser in the sector, falling 9.9% (-$1.35) to close at $12.33 with 15,083 shares moving. The stock traded in a range of $11.70 to $14.

Pacira Pharmaceuticals (PCRX) rose 8.4% to close at $16.20, cross its 50-day moving average of $15.18 and 200-day moving average of $12.16.

SciClone Pharmaceuticals (SCLN) rose 15.3% to close at $5.88, approaching its 50-day moving average of $6.19. It has also moved closer to its 200-day moving average of $5.91. Chemed Corporation (CRVL) fell 1.4% to close at $61.61, moving closer to its 50-day moving average of $61.54. Also, the stock moved closer to its 200-day moving average of $45.17.

Express Scripts (ESRX) hit a new 52-week high today, reaching $62.80 to top the previous high of $60.88.

Durata Therapeutics (DRTX) hit a new 52-week low today, hitting $6.68 to fall below the previous low of $7.25.