The Health Care sector (XLV) showed little change during trading today while the S&P 500 rose 0.1%.

As a proxy for the sector, the ETF tracked closer to the overall market today than over the past month. Entering today's trading, XLV was up 2.4% over the last thirty trading days while the S&P 500 climbed 4.7%.

Select Medical Holdings Corporation (SEM) was a significant gainer in the sector, rising 16%. The stock closed at $13.73 with 1.8 million shares moving. The stock traded in a range of $12.50 to $14.89. Amedisys (AMED) also gained today, climbing $1.21 (+9.6%) to close at $13.82.

Spectrum Pharmaceuticals (SPPI) was a major loser in the sector, falling 14.2% (-$1.96) to close at $11.81 with 7.3 million shares moving. The stock traded in a range of $11.71 to $13.44. The stock has been going in a negative direction over the last month, dropping $4.98 (-29.7%) from a price of $16.79 on July 10, 2012.

Aegerion Pharmaceuticals (AEGR) fell 9% to close at $13.54, crossing its 50-day moving average of $14.83. Meanwhile, LabCorp (LH) climbed 1.2% to close at $89, moving past its 200-day moving average of $88.19.

Genomic Health (GHDX) rose 1.3% to close at $31.33, approaching its 50-day moving average of $34.02. It has also moved closer to its 200-day moving average of $31.39. National HealthCare Corporation (VVUS) fell 1.3% to close at $45.62, moving closer to its 50-day moving average of $45.03. Also, the stock moved closer to its 200-day moving average of $21.71.

AVEO Pharmaceuticals (AVEO) hit a new 52-week low today, hitting $7.89 to fall below the previous low of $8.62.