European stocks languish near year's low; Glencore halts slide

* FTSEurofirst 300 down 0.3 percent, off lows

* Glencore (Xetra: A1JAGV - news) claws back some ground from Monday's sell-off

* European biotech stocks hit by drop in U.S (Other OTC: UBGXF - news) . counterparts

* Wolseley (LSE: WOS.L - news) slumps after cutting outlook (Updates with fresh prices and quote)

By Alistair Smout and Sudip Kar-Gupta

LONDON, Sept 29 (Reuters) - European shares partially recovered from an early drop on Tuesday, supported after battered miner Glencore halted a slide in its share price, although top indexes lingered near their lows for 2015.

The pan-European FTSEurofirst 300 index had dropped 0.3 percent by 1420 GMT on Tuesday, having been down as much as 1.7 percent in early deals.

The index fell more than 2 percent on Monday, and Tuesday morning's early retreat took it just 0.8 percent away from its low for 2015, set in August.

Glencore surged 17.5 percent, having dropped 30 percent in the previous session to an all-time low, extending earlier gains after the mining and trading company declared its business remained "operationally and financially robust".

Several brokers said worries over the commodities and mining company's debt pile were overdone.

"Momentum is against Glencore, but fundamentally the stock is very cheap, and we don't think that is justified," said Ankit Gheedia, equity and derivatives strategist at BNP Paribas (Xetra: 887771 - news) .

He said the drop in the broader market in recent weeks had also been exaggerated. "Fundamentally the falls have gone too far, but the momentum tends to persist for a bit longer, even while the fundamentals are fine."

The FTSEurofirst 300 is down around 20 percent since April (LSE: 0N69.L - news) , when it touched its highest level since 2000. Germany's DAX hit a record high of 12,390.75 points in April but is now some 24 percent below those levels.

Stock markets have lost ground in the past few months partly due to signs of a slowdown in China, which has also hit the commodity sector as China is a major consumer of metals and oil.

The prolonged plunge in metals prices has been one of the reasons behind Glencore's stock market slump.

U.S. bank Citigroup (NYSE: C - news) said Glencore should even consider going private via a management buyout if the market turmoil continued, and kept a "buy" rating on Glencore shares.

The STOXX Europe 600 Health Care index was the biggest sectoral laggard, dropping 2 percent after U.S. pharmaceutical and biotech stocks fell overnight.

The U.S. biotech sector was hit after U.S. Democratic lawmakers on Monday denounced "massive" price increases for two heart drugs from Valeant Pharmaceuticals.

In Europe, British healthcare group Shire (Xetra: S7E.DE - news) was down by 2.5 percent while Switzerland's BB Biotech (Other OTC: BBAGF - news) retreated 4.2 percent.

Building supplier Wolseley fell 13 percent after lowering its second half revenue growth forecast, saying it expected markets in North America and Britain to remain challenging.

"The... drop is probably an over-reaction. The trouble is that volatility breeds volatility," Jasper Lawler, market analyst at CMC Markets, said in a note, citing the wild swings in previous sessions in Glencore.

"When Glencore stock plunges 27 percent, it creates an expectation that there could be a double digit drop on any company news."

Today's European research round-up (Additional reporting by Lionel Laurent; Editing by Tom Heneghan)