Dementia expert Dr. Jason Karlawish told CNBC he’s skeptical of the Food and Drug Administration’s approval of Biogen‘s Alzheimer’s disease drug, Aduhelm, saying “the evidence to approve the drug wasn’t sufficient.”

“Another study is needed to establish whether this drug, in fact, is effective. Unfortunately, the FDA approved the drug for marketing, although they also do want another study,” the co-director of the Penn Memory Center at the University of Pennsylvania said on Monday following the agency’s formal OK.

The FDA’s approval marks the first new treatment for Alzheimer’s in nearly two decades. Alzheimer’s is a progressive neurodegenerative disorder that slowly destroys memory and thinking skills. More than 6 million Americans live with the disease, according to estimates by the Alzheimer’s Association.

Karlawish told “The News with Shepard Smith” that there are a lot of promising Alzheimer’s drugs in the pipeline.

“I’m optimistic about the coming future here, so I have hope. I just think this is not the drug upon which to pin our hopes,” he said. “Desperation should drive funding for Alzheimer’s research, it should not drive the interpretation of scientific evidence.”

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