Lung cancer and nigella sativa oil

Hello,
I am writing again about my father. He started using nigella sativa oil at the end of December ( 1 month ago) and I see a lot of improvements. He hasn't done any check up, but his voice (he lost his voice again in September before starting a new chemo treatment that didn't give any result) is back again (almost normal voice), he is more enthusiastic, the cough is not so often as before, and he has gained weight. In fact, during chemo treatment he has lost just some kilos, but since starting nigella he has gained 4-5 kg.
I am wondering if gaining weight is a good sign or not?
Any suggestion or opinion?
best regards
eva
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