Once again, the biotechnology sector is heading higher on Tuesday. The SPDR S&P Biotech ETF (XBI), iShares NASDAQ Biotechnology Index ETF (IBB) and Health Care SPDR ETF (XLV) are all green today. This continues to support the fact that biotech stocks have enjoyed respectable gains this year. The NASDAQ Biotechnology Index (IBB) reached new highs this year and has seen a 20 percent increase over the last year, its top 5 holdings currently include: Biogen Inc. (BIIB)Amgen Inc. (AMGN)Gilead Sciences Inc. (GILD)Celgene Corp. (CELG)Illumina Inc. (ILMN) A number of these biotechnology companies both large and small have been capitalizing on the move that the sector has been making. Much of the excitement has stemmed from new, cutting edge research & development being undertaken by these companies. Included in this are immunotherapy companies looking to tackle the unending challenge to fight certain types of cancers along with other diseases. Click Here To See Biotech Stocks Capitalizing On Industry Momentum.