Without Wahbi Khazri and Mathieu Debuchy among others, Romain Hamouma played a crucial role against his former club and was involved in the three first-half goals. He scored Saint-Etienne's opener in the fifth minute and then delivered assists for Robert Beric and Arnaud Nordin.
Lamine Ghezali and Valentin Vada were also on the scoresheet. "They taught us a football lesson," said Caen captain Faycal Fajr, whose side remained bottom, nine points from safety. "This was our worse game this season."
Elsewhere, Guingamp secured an important 1-0 win over Dijon in the fight against relegation. The result took the Brittany side to 18th. Angers was held to a goalless draw by Amiens while Nimes salvaged a 2-2 draw with Strasbourg after Teji Savanier equalized from the spot in stoppage time.
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