Hi Sharza and thank you for your post 

Preinvasive lung lesions, may represent premalignant (cancer) to low-grade malignant lesions without evidence of invasion. This means they have not yet gained the ability to spread to other organs of the body.  Invasive cancer occurs when cancer cells have the ability to  break away from the primary site and can potentially spread to other parts of the body, via the lymphatic system or bloodstream.

You may like to read about stages and types of lung cancer  on our website.

I hope  I have answered your question. Please get back to us if you need any more information or support.  You may find it helpful to talk things through with one of the nurses on our helpline.  The number to call is Freephone 0808 800 4040 and the lines are open from 9am till 5pm Monday to Friday.

Kind regards,

Tina

Thank you so much for your clear and informative answer.