Hi Belinda
No Rob didn't have any underlying issues,he was as healthy as an ox and hadn't seen a doctor for 15 years.He was however a heavy drinker and a smoker and of course his diagnosis was missed by a negligent dentist who failed to identify his tumour when he saw it seven months prior to his eventual diagnosis.By the time it was found he already had a very large secondary and his survival chances were reduced to 30% from the outset.You have so much to fight for and thats half the battle,the other half is youth,strength and great doctors.
The very best of luck