I am glad to hear that your Dad is doing better and is eating and not losing weight.
I too would be worried about the next chemo treatment, as he didn't tolerate this last one very well. I am gald that there are at least some options for your Dad to try and fight this. 18 months and still ging is a great thing.
My Dad is not doing any better as of today. He had a bad day yesterday, and today doesn't look real promising either. He got up this morning with the intent of going to my brothers house as he has been doing for almost two years every Sunday to help him build an addition on his house, and for the first time, cancelled out. I went outside to let the dogs out and his was in the garage unloading his tools from the car. He told me he didn't feel well enough to go, which I never thought I would here him say. He just goes, and gets sick while he is there, but keeps pushing himself to complete the next task. He said he just took his meds and was going to lay down for awhile. What was strange is that he told me he would see me in the afternoon, and gave me a hug and kiss. Mind you that he lives with us, and was only going upstairs. Of course my heart just melted, as I got to breifly hold him,kiss and hug him back.
My Dad is a little older than yours and I would guess that the cancer was more involved at the time of diagnosis, so I am not certain that we are going to have any treatment options.
I will keep you posted and I hope your Dad continues to improve.