I was diagnosed with Breast Cancer in March of 2007. It is not the same as lung and liver but cancer still. I wrote this response to another mom in 2009 but thought I could share it with you also as some of the same things are relevent. So here it is.
It was the worst moment I can remember. And my husband was on a trip to disney world with my sons band group. Here are the things that helped me the most.
Keep in touch but don't let it be the only topic of conversation. talk about if and when he is ready to but talk about other stuff also
Bring meals or set up a meal plan. Depending on the treatment schedule they may or may not be able to cook. Are there older kids in school Come over one day and make up lunches.
Make a list of what they normally do and see if you can help to get those things done. they may be little things but little things when your puking from chemo are the things that tip you over the edge.
take him back and forth to chemo if you can. don't expect him to "want" you to sit with him. sometimes he will and others he will wish everyone in the world would just get the heck away from him. at least I did.
here is one that a friend of my sons did for me. if he has chemo his hair will fall out. offer to take him for a hair cut when it starts to come out and then shave it for him when it is down to just whisps. One of my sons girlfriends shaved mine for me when I was so sick I couldn't imagine going out in public ever again. but she shaved it with a bic razer and then massaged it afterwords with some lotion. it made me feel pampered in the midst of some of the worst months of my life. she did it about once a week with the lotion till my hair grew back.
the main thing though is to not disappear from her life. I have friends who I thought were as close as my sister. but when I was diagnosed with this they disappeared. It doesn't make them bad people it just showed where I fit in on the scale for them. The friends who stick by you in these things are the true friends. and not just buying dinner but going out with you bald and changing bandages on scars that no woman should have to deal with. ok so now I'm crying as I write this. just be a true friend and stick by her