* FTSEurofirst 300 closes 0.01 pct higher
* Shire leads Pharmaceuticals higher
* Deutsche Boerse rises on cost cuts
By Brian Gorman
LONDON, March 24 (Reuters) - European shares closed flat on Wednesday, with Shire <SHP.L> leading pharmaceuticals up as it gained from a competitor's problems, and as the market shrugged off a Fitch downgrade of Portugal's sovereign debt.
The FTSEurofirst 300 <
> index of top European shares rose 0.01 percent to 1,072.54 points, a new 17-month closing high, having earlier sunk as low as 1,064.65.The European benchmark is up more than 66 percent from its lifetime low of March 9, 2009.
Shire <SHP.L> rose 2.1 percent, after gaining as much as 3.2 percent to hit an all-time high, as ongoing manufacturing problems at U.S. rival Genzyme <GENZ.O> boosted prospects for Shire's enzyme replacement treatments.
GlaxoSmithKline <GSK.L>, AstraZeneca <AZN.L>, Novartis <NOVN.VX> and Novo Nordisk <NOVOb.CO> rose between 0.6 and 3.2 percent.
Several banks fell, after Fitch cut Portugal's debt rating by one notch to AA-. [
]The move came as concerns over Greece's debt situation remained and a day before a European Union summit.
BBVA <BBVA.MC>, HSBC <HSBA.L>, Danske Bank <DANSKE.CO> and Millennium BCP <BCP.LS> slipped between 0.2 and 2.2 percent.
Banco Santander <SAN.MC> fell 2.5 percent on speculation the bank was guiding down on its Brazilian loan growth target in London, traders said. Santander said the targets were unchanged.
"We kind of knew the Portugal downgrade was coming, so the markets weren't worried, but that is indicative of the high level of complacency in the markets," said Andy Lynch, fund manager at Schroders.
He added: "You don't know how the future is going to play out, but you do know that interest rates are going to stay low, and you can borrow to invest."
The <.VIX> index, a measure of investor anxiety, rose 6.7 percent, up from a 22-month low.
Lynch said: "The low level of the VIX we've seen also doesn't seem right. Government deficits are still a problem. The way to play it is to go for defensives."
DEUTSCHE BOERSE GAINS
Among individual shares, Deutsche Boerse <DB1Gn.DE> gained 4.6 percent after it announced more cost savings measures.
Fiat <FIA.MI> rose 3.9 percent after newspaper reports said it is planning higher than expected job cuts of 5,000 in Italy and may spin off its car activities sooner than thought this Summer. Fiat declined to comment on the reports.
A stronger dollar and weaker metals prices failed to stop some miners rising.
Anglo American <AAL.L> rose 0.9 percent after JP Morgan upgraded it to "overweight". Rio Tinto <RIO.L> rose 1.4 percent.
The FTSE 100 <
> index ended the day 0.1 percent higher. Also in the UK, finance minister Alistair Darling cut his forecast for government borrowing, in his annual budget on Wednesday, while housebuilders rose after he raised the stamp duty threshold for first-time buyers.Persimmon <PSN.L>, Barratt Developments <BDEV.L> and Bellway <BWY.L> all rose between 3.1 and 5.6 percent. ,
Across Europe, Germany's DAX <
> rose 0.4 percent and France's CAC 40 < > lost 0.1 percent, while Portugal's share benchmark < > fell 1 percent.U.S. economic news was mixed. Sales of newly built U.S. homes fell for a fourth straight month to a record low in February, but another rise in new orders for durable goods offered hope that the economic recovery remained on course. [
]Wall Street was lower around the time European bourses were closing. The Dow Jones <
>, S&P 500 <.SPX> and Nasdaq Composite < > were down between 0.3 and 0.5 percent. (Editing by Simon Jessop)