MC dude should have realised their chances of getting out alive are minimal. He's dealing with criminals with plenty of bloody on their hands already, hardcore killers. Give them what they want, and they won't have any use for you anymore. If he lied about the locations of the items, he might have some chances left. If he didn't, he should consider himself as good as dead, unless those body snatchers have some unmentionable use for him alive. However, since they are dealing with corpses as their merchandise, I wouldn't count on it. Other than that, he lost his sister already and he's a terminal patient himself, so, like he said, he's a dead man walking, with little to lose. Does he really need to care about the police officer so much? They are totally unrelated. It's also kind of funny a cop would be working totally alone on a dangerous mission, so if she dies, she can only blame herself.
However, all that being said, we did see the Green Bull leader being some kind of cyborg and not worried at all when meeting Ah 'Xenomorph' Liang, so we don't even know what those two lab coat crooks will find when they go back to the secret lab. Ah Liang might have made a deal with the competitor. Who knows.