The incidence of grade 3 or worse adverse events , including deaths , was higher in the necitumumab plus pemetrexed and cisplatin group than in the pemetrexed and cisplatin group ; in particular , deaths regarded as related to study drug were reported in 15 ( 5 % ) of 304 patients in the necitumumab group versus nine ( 3 % ) of 312 patients in the pemetrexed and cisplatin group .