(CNN) In a groundbreaking case against agricultural giant Monsanto, a jury has awarded $250 million in punitive damages and nearly $40 million in compensatory damages to a former school groundskeeper who said he got terminal cancer from the weedkiller Roundup.

Dewayne Johnson was seeking about $400 million in punitive damages and $39 million in compensatory damages from Monsanto, his attorney Timothy Litzenburg said.