NEW YORK ( TheStreet) -TheStreet Ratings' stock model downgraded Myriad Genetics Inc ( MYGN) to 'Hold' from 'Buy'. Net income at this $1.8 billion market cap, health diagnostics company shrank by 31.6% to $24.2 million in the fiscal second quarter compared to the year earlier quarter.

TheStreet Ratings released rating changes on seven U.S. common stocks for January 28, 2011. In total, three stocks were upgraded and four stocks were downgraded by our stock model.

In the fiscal second quarter, Myriad Genetics reported $100.4 million in revenue, an increase of 8.3% compared to the year earlier quarter. Learn more about Myriad Genetics: Company Profile, Income Statement, Balance Sheet, Stock Ratios, Analyst Ratings.

$658 million market cap, pharmaceutical company, Simcere Pharmaceutical Group ADR ( SCR) was upgraded to 'Buy' from 'Hold'. In third quarter results, Simcere Pharmaceutical Group turned in a profit of $8.3 million, an increase of 243.6% when compared to the year earlier quarter. Over the same time period, revenue grew by 29.4% to $80.2 million. Learn more about Simcere Pharmaceutical Group: Company Profile, Income Statement, Balance Sheet, Stock Ratios, Analyst Ratings.

-- Reported by Kevin Baker in Jupiter, FL.

For additional Investment Research check out our Ratings Research Center.

Kevin Baker became the senior financial analyst for TheStreet Ratings upon the August 2006 acquisition of Weiss Ratings by TheStreet.com, covering mutual funds. He joined the Weiss Group in 1997 as a banking and brokerage analyst. In 1999, he created the Weiss Group's first ratings to gauge the level of risk in U.S. equities. Baker received a B.S. degree in management from Rensselaer Polytechnic Institute and an M.B.A. with a finance specialization from Nova Southeastern University.

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