My mum in law has stage 4 lung cancer diagnosed in August. She had 1 session of chemo but ended up in hospital with an infection. She then had 5 days of radiotherapy and is feeling and breathing much better. She saw her oncologist 16 December and he is not currently discussing any further treatment until end Feb 2025. This seems quite a long time without treatment. She is on palliative care. Should I be concerned ?