Confused.com - looking for advice about radiotherapy

Hi, Newbie here.

Male, 61.

Don't normally use online forums but my head is placed up my backside.

I was diagnosed with a dedifferentiated atypical lipomatous tumour with focal osteosarcoma, basically a lump on my outer chest wall which required the removal of two ribs and associated bits.

This was carried out in October by the wonderful team  in Glasgow.

I attended another specialist hospital, also Glasgow, to discuss any requirement for adjuvant treatment.

They advised that at present the risk of the cancer returning in the same area was 15%, if I have 6 weeks of Radiotherapy then that would reduce to 10%.

The decision to  receive the treatment is mine.

The consultant then gave me an insight into the long and short term after effects of radiotherapy.

I appreciated his honesty but he left me in a quandary.

Is the extra 5% comfort factor worth the possible side effects?

I don't know.

I'm fortunate not to have any family or close friends who have been through it.

But I really don't know what to do.

They gave me a week to decide.

Any feedback appreciated.

Thanks.