Secondary Cancer More Condition_symptoms If A Cancer In The Submondular Gland Is A Secondary Cancer Where Is The Primary Cancer Likely To Be ?

If a cancer in the submondular gland is a secondary cancer where is the primary cancer likely to be ? - secondary cancer more condition_symptoms

Doctors do not seem to have found the primary cancer. Where the situation is to be. I have tried to contact McMillan nurse every day, but no answer.