A $289 million award against Monsanto in a case linking its Roundup weed killer to terminal cancer in a former school groundskeeper may lead to similar judgments against the company, according to the man's lawyers.

The ruling in favor of Dewayne Johnson, 46, was announced in San Francisco Friday. Roundup contributed to Johnson's non-Hodgkin's lymphoma and Monsanto should have provided a warning label about the potential health risks, the state Superior Court jury said in its decision, the Associated Press reported.

"I'm glad to be here to be able to help in a cause that's way bigger than me," Johnson said at a news conference after the verdict was announced.

This was the first Roundup-related case filed by a cancer patient against Monsanto, and was expedited because court filings noted that Johnson was dying. The case could set a precedent for many others, according to the AP.

The company will appeal, said Monsanto spokesman Scott Partridge, who noted that scientific studies and two government agencies have concluded that Roundup does not cause cancer.

Glyphosate -- the active ingredient in Roundup -- is safe when used according to label directions, according to the U.S. Environmental Protection Agency.

But in 2015, glyphosate was classified as a "probable human carcinogen," by the International Agency for Research on Cancer, which is part of the World Health Organization, the AP reported.

Glyphosate is on California's list of chemicals known to cause cancer.

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