Here's Where Things Went Wrong for Celgene Corporation in 2017

Up until a couple years ago, Celgene Corporation (NASDAQ: CELG) had had one of the best-performing stocks among big biotechs. But in the last half of 2017, the company's most important products hit some stumbling blocks that sent investors running for the hills.

Here's a closer look at what went wrong for Celgene in 2017.

Visibility issues

Back in 2015, Celgene raised a lot of eyebrows with extremely optimistic predictions that included net product sales rising to $21.0 billion in 2020, from just $7.7 billion recorded in 2014. Going into the second half of 2017, Celgene's top line had been rising fast enough to reach its lofty goal.

CELG Chart
CELG Chart

CELG data by YCharts.

But markets loathe uncertainty, which is why the stock tumbled about 18% when management revised its 2020 outlook downward in its third-quarter report this October. Now Celgene expects net product sales to land between $19 billion and $20 billion in 2020, instead of the $21 billion figure the company rolled out a few years ago.

To understand why the stock took a beating that seems disproportionate to the downward revision, we need to look at the moving pieces that informed management's estimate. Celgene's been reducing its dependence on Revlimid sales, which still comprise about 63% of the company's total revenue. Previous long-term guidance suggested sales of inflammation and immunology drugs would pass $4.0 billion in 2020, but now the company expects $2.8 billion or less.

Intense competition for patients with chronic immune disorders is a big part of the problem. Sales of Celgene's Otezla tablets, for the treatment of psoriasis, exploded following its 2014 commercial launch, but American pharmacy benefit managers have upped their game. In the vital U.S. market, Otezla sales grew just 2.5% in the third quarter compared to the same period last year. Just a few months earlier, Celgene reported second-quarter Otezla sales rose 41% year on year.

Laboratory technician using a pipette
Laboratory technician using a pipette

Image source: Getty Images.

Development issues

Stagnating Otezla sales are only part of the reason Celgene lowered the outlook for its burgeoning inflammation and immunology segment. A late-stage flop with GED-301, an intended treatment for ulcerative colitis, poked another hole in the company's outlook. Celgene bought rights to the experimental therapy for $710 million upfront after it succeeded in a midstage clinical trial, and will continue another irritable bowel study with the drug. But the ulcerative-colitis trial failure will probably be the end of the line for an asset previously expected to contribute more $500 million in annual sales at its peak.