European healthcare stocks ended a run of gains in October, raising concerns for drugmakers like Novo Nordisk (NVO.US)

European healthcare stocks' longest winning streak since March 2010 is set to end as investors fret over Novo Nordisk's (NVO.US) upcoming third-quarter results and updates on experimental drugs from AstraZeneca (AZN.US) and Roche (RHHBY.US), data show. The Stoxx 600 healthcare index has fallen 6.1% this month, ending a 10-month winning streak, with Novo Nordisk, AstraZeneca and Roche accounting for about 90% of the decline since the start of the month.