Patients received amrubicin ( @-@ years old , @-@ mg/m ( @ ) ; @ years old , @ mg/m ( @ ) ) intravenously on days @ to @ every @ weeks for @ to @ cycles or carboplatin ( area under the curve of @ intravenously on day @ ) and etoposide ( @ mg/m ( @ ) intravenously on days @ to @ ) every @ weeks for @ to @ cycles .