A.T. Robertson Commentary 1 Corinthians 15:18

"Then they also that are fallen asleep in Christ have perished." — 1 Corinthians 15:18 (ASV)

Then also (αρα κα). Inevitable inference.

Have perished (απωλοντο). Did perish. Second aorist middle indicative of απολλυμ, to destroy, middle, to perish (delivered up to eternal misery). Cf. 8:11.