Does anyone know where I can research the approximate time it takes for oral squamous cell carcinoma that started as a small hard mass (like a callous)on the inside of my lower gum that progressed over time to a small hole in my gum then into stage 4 cancer? They had to remove my lower jaw,one third of my tongue and my lymphoid s on the right side of my neck.They were removed as a precaution. The cancer never spread to them.I want to emphasize the importance of seeing ENT (Ear,Nose & Throat) or an Oral surgeon if you have a sore in your mouth that doesn't heal within a two week period.Insist on a biopsy to rule out cancer.