This Week in Biotech: Gilead Sciences, Inc. (GILD), GlaxoSmithKline plc (ADR) (GSK)

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With the SPDR S&P Biotech Index up 31% over the trailing-12-month period, it’s evident that investment dollars are willingly flowing into the biotech sector. Keeping that in mind, let’s have a look at some of the rulings, studies, and companies that made waves in the sector last week.

For a second week in a row we were privy to a little bit of everything: FDA panel reviews, new clinical data, detailed FDA updates, buyout rumors, and even snowstorms.

On Monday, Depomed Inc (NASDAQ:DEPO) announced that the Reproductive Health Drugs Advisory Committee was recommending against the approval of its hot-flash drug, Sefelsa, with 12 of 14 members ushering in a thumbs-down. The negative ruling wasn’t a huge shock, as Sefelsa didn’t meet its primary endpoints in the first two clinical trials and had what I deem an abnormally large number of patients drop out of all three trials. In the meantime, DepoMed plans to completely abandon all spending and research on Sefelsa unless it appears the drug has a good shot at gaining approval. Shares dipped by 9.5% this week.

Gilead Sciences, Inc. (NASDAQ:GILD)Gilead Sciences, Inc. (NASDAQ:GILD) continues to churn out nothing but fantastic news with its experimental oral hepatitis-C drug, Sofosbuvir. In a mid-stage combination trial with Johnson & Johnson (NYSE:JNJ) and Medivir‘s Simeprevir, the combo cleared all detectable levels of the virus in 100% of genotype 1 patients — the most common form of hepatitis-C. With no adverse events reported, Sofosbuvir once again proved to the biotech community that it could be the standalone and combination drug of choice in oral hepatitis-C care.

Pharmaceutical company Impax Laboratories Inc (NASDAQ:IPXL) was crushed on Tuesday, after it provided an update to investors regarding the FDA’s complete response letter on idiopathic Parkinson’s disease drug Rytary. According to the update, the FDA cited 12 points of concern with its Hayward, Calif., facility, of which three were repeat violations from a warning letter sent to the company in 2011. What this means for Impax is longer delays in attempting to rectify these problems and probably another nine months to a year before Rytary goes before the FDA for a third time. Shares fell nearly 17% on the week.

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