Friday's ETF Winners & Losers

The HealthShares Emerging Cancer(HHJ Quote) exchange-traded fund was Friday's best performer. Dendreon(DNDN Quote) soared 164.2% after the Food and Drug Administration said the company's prostate cancer vaccine treatment, Provenge, was safe and effective in treating prostate cancer. The ETF was jumping $2.40, or 10.7%, to $24.82.

Other biotech and health care ETFs were gaining ground. The PowerShares FTSE RAFI Health Care(PRFH Quote) was adding 4% to $50.98. The First Trust Amex Biotechnology Index(FBT Quote) was gaining 1% to $23.84. The SPDR S&P Biotech(XBI Quote) was up 0.9% at $48.22.

On the other hand, the B2B Internet HOLDRs(BHH Quote) ETF was lower, as holdings Ariba(ARBA Quote) and Checkfree(CKFR Quote) were shedding 1.5%. The ETF was off 4 cents, or 1.8%, to $2.14.

Bundled securities tracking the energy sector were also among the losers of the day, as oil prices retraced some of its 6% gain for the week. The front-month May crude contract was recently losing 26 cents to $65.77 a barrel.

The Energy Select Sector SPDR(XLE Quote) ETF was recently down 1.4% to $60.25. The iShares Dow Jones U.S. Oil Equipment Index(IEZ Quote) ETF was off 1.3% to $48.14. The PowerShares Dynamic Energy Exploration(PXE Quote) ETF was losing 1.2% to $20.30. The Oil Services HOLDRs(OIH Quote) ETF eased 1.1% to $146.35.