CREATE TABLE table_55140 ("Title" TEXT, "Publisher" TEXT, "First Year" TEXT, "Last Year" TEXT, "Genre" TEXT)

When did the DC Comics title that debuted in 1937 end?
SELECT "Last Year" FROM table_55140 WHERE "First Year" = '1937' AND "Publisher" = 'dc comics'
SELECT "Last Year" FROM "table_55140" WHERE "First Year" = '1937' AND "Publisher" = 'dc comics'