Is Celgene a Beaten-Up Biotech Stock to Buy?

Biotechs are exposed to a litany of risks including patent expiration, clinical-trial failures, and advances by competitors. That can make it one of the trickiest industries for investors to navigate.

Even the biggest biotech stocks can stumble, and when they do, it can be tough to know if it's smart to buy shares. For instance, a run of bad luck has caused Celgene Corp. (NASDAQ: CELG) to tumble. Is now a good time to add it to your portfolio?

An important date to remember

Celgene may be one of the most successful biotech companies on the planet, but that success has come largely on the back of one drug: Revlimid.

A person in a suit. A green dollar sign floats above one upturned palm while a red dollar signs floats above the other.
A person in a suit. A green dollar sign floats above one upturned palm while a red dollar signs floats above the other.

IMAGE SOURCE: GETTY IMAGES.

Since winning Food and Drug Administration (FDA) approval in 2006, Revlimid has become widely used in first-line and second-line multiple myeloma treatment. Recently, the drug's use has become even more common following its approval last year as a maintenance therapy to delay disease progression in patients who have undergone a stem cell transplant.

Due to its expanding addressable market, Revlimid's one of the best-selling cancer drugs in the world. Last year, the drug's sales increased 17% year over year, to $8.2 billion, accounting for 63% of Celgene's total revenue.

Revlimid's success has been a big reason why Celgene's shares have climbed from about $20 in 2009 to over $90 today. However, if Celgene doesn't diversify, its sales and share price could suffer when Revlimid loses patent protection.

The drug has patents that extend protection to 2027, but generic drugmakers are challenging them. In 2015, Celgene cut a deal that allows Natco to begin selling limited quantities of generic Revlimid in 2023. As part of that settlement, Natco can sell increasingly more Revlimid every year from 2023 until 2026, when it will be allowed to sell an unlimited amount of its generic.

Natco isn't the only company eyeing Revlimid's market share, either. A number of other generic drugmakers, including Dr. Reddy's, are challenging Revlimid's patents. If they succeed, multiple vendors could wind up vying for Revlimid sales after 2022.

Diversifying its sales

Recognizing the patent risk to its chief moneymaker, Celgene's investing heavily in internal and external research and development (R&D) projects and financing its own drug development, while also acquiring and licensing promising clinical-stage drugs. For instance, its acquisition of Abraxis in 2010 landed it the pancreatic cancer drug Abraxane, which contributed nearly $1 billion to revenue in 2017. Pomalyst, a third-line multiple myeloma drug that's becoming commonly used in third-line multiple myeloma, contributed $1.6 billion to sales last year, up 24% from 2016.