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While a number of analysts maintained prior ratings on Exact Sciences, Rodman & Renshaw downgraded the company to Perform from Outperform.

The analyst said that the launch of GTG's BrevaGen test in the US in June is expected to "add significantly to revenues from FY 13 and profit in FY 14."

Several analysts lowered EPS, revenue, and price target estimates for Life Tech, though one analyst cited a bright note on the company's Ion Torrent business.

Analyst Amit Bhalla said that trade-in revenue from customers who purchase the HiSeq 2000 platform would not be a "significant contributor," and trimmed total revenue estimates for the second quarter and full-year 2011.

The bank cited a lack of apparent competitive bids to acquire Gen-Probe in dropping its price target to $75.

In a research note, the investment house cited concerns about Cepheid's high price-to-sale ratio but said that the firm's installed base is expected to grow 27 percent year over year in 2011.

The investment firm lowered EPS estimates for Illumina on an expected shift to the MiSeq platform from the HiSeq system, but said that in a short amount of time Illumina's desktop sequencer would overtake Ion Torrent's PGM as the market leader.

The bank raised its price target on Cepheid's stock from $33 to $38 and upped its revenues and EPS estimates for 2012.

The investment firm lowered revenue estimates and the share-price target for Nanosphere following the FDA's denial of the company's Plavix metabolism test.

Jefferies also increased the firm's stock price target to $20 from $15.50.

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CBS This Morning highlights recent Medicare fraud involving offers of genetic testing.

Researchers find that many cancer drugs in development don't work quite how their developers thought they did, as Discover's D-brief blog reports.

Mariya Gabriel, a Bulgarian politician, is to be the next European Union research commissioner, according to Science.

In Science this week: a survey indicates that US adults are more likely to support the agricultural use of gene drives if they target non-native species and if they are limited, and more.