The BioWorld Biopharmaceutical Index extended its downward trend over April and May, closing the latter month down 6.47% after reaching a peak gain of 9.64% at the end of February. The Nasdaq Biotechnology Index followed a similar trajectory, finishing May with a 5.37% decline. Meanwhile, the Dow Jones Industrial Average dipped through April but rebounded slightly in May, ending the month down 0.64%.