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Monsanto weed-killer cancer risk; Gilead's drug warning; Tenet jumps on deals

Here’s a look at some of the stocks the Yahoo Finance team will be tracking for you today.

Monsanto (MON) shares are lower ahead of the open. A new report by the World Health Organization says the company's weed-killer Roundup probably causes cancer. Monsanto strongly disagreed with the findings, saying its products are safe and meet regulatory standards.

Gilead Sciences (GILD) shares falling. The company sent warnings to health providers after patients taking its hepatitis C medications developed problems when taking the drugs in combination with another type of heart treatment, according to Bloomberg.

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Tenet Healthcare (THC) shares are higher in early trading. The hospital operator is forming a joint venture with privately held United Surgical. The two companies are combining their imaging and outpatient surgery centers in a deal valued at more than $2 billion. Separately in a much smaller deal, Tenet is buying UK based Aspen Healthcare for $215 million in cash.

Biogen (BIIB) shares are lower in early trading after jumping nearly 10% on Friday on news its experimental Alzheimer's drug showed promising results in clinical trials. The biotech firm announcing today it is dropping Idec from its name and will be simply known as Biogen. The company merged with Idec in 2003. Biogen will continue to trade on the Nasdaq under the ticker symbol "BIIB."