Sixteen-year-old Mbaye Niang scored after a minute of his first Ligue 1 game as Caen reached the 40-point mark with a draw which did little to help Lens in their fight for survival.
Niang latched onto Kandia Traore's cross to give Caen the perfect start, but Raphael Varane got the equaliser in the 37th minute to ensure the points were shared.
The draw left Lens deep in trouble in 19th place with 31 points and needing big things out of their final four games.
It was Niang who stole the limelight today, though.
Romain Hamouma released Traore down the left and the forward crossed back for Niang to finish from close range, beating Vedran Runje who could have done better.
Lens piled on the pressure thereafter, Kanga Akale seeing his shot deflected over, then picking out Eduardo with the resulting corner for a header which went inches over.
Varane then brought a fine reflex save out of Alexis Thebaux with a header from close range, before, after 24 minutes, Akale hit the post.
Thebaux was in action again after 36 minutes, keeping out Franck Queudrue's goalbound free-kick, but from the resulting corner Akale found Varane and his header left the goalkeeper with no chance.
After the break Caen went on the front foot, Yohan Mollo's curling shot on the hour bringing an excellent save out of Runje.
Five minutes later Mollo's free-kick found Hamouma, whose header was saved by Runje on the line.
At the other end Toifilou Maoulida contrived to miss from two yards, Lens broke away and Runje blocked Hamouma's volley.
Niang could have had a second after 72 minutes but he was denied by Runje, but the goalkeeper needed rescuing three minutes from time when Yohan Demont blocked Youssef El Arabi's volley on the line.