hi , i'm about to try my first PDX experiments with NSG mouse strain in few weeks and i wonder there is any preference of age or sex of NSG mouse for PDX . i heard that , for breast cancer , it would be good to use female NSG mouse of 6 weeks. however ,  in my case , i'm dealing with lymphoma case so i think that it would be little bit different from that .  

it's pretty hard to find some reference about those things so it would be very appreciated if i could get some answers about it.