Hi, thanks for using healthcare magic
Persistent sore throat
can be related to : (1) allergic sinusitis
(2) recurrent infection (3) smoking
(4) gastroesophageal reflux disease
With a history of allergies and sinusitis , it may be related to this but it would be best to visit an ENT doctor for an evaluation.
It may not be related to cancer it would be best to take a look.
I hope this helps