In medicine we have many terms used and one of them is 'cure rate' or recurrence rate. This is tru especially in cancer diagnosis. If we have a patient who has say 1 cm lung nodule and we do surgery and it is taken out , and we have no evidence of spread of the cancer at the time of surgery, we call it a success. But is it really a cure ?The answer is yes and no - many will be cured and some will have recurrence of the cancer . We usually do follow up CT scan for 3 years as the majority will recur in 3 years and if there is no recurrence of cancer in 3 years then we are 'safe' and the chance of recurrence is very little. This brings me to the story for today.
I saw this lade few years ago. She was a nonsmoker and had kidney cancer taken out several years ago - 5- 6 years ago. She was followed by a cancer specialist and he did CT scan every so often . One of the CT scan showed some nodule - a tiny density . He told her there is not much and wanted to redo new CT scan . She came to me and I reviewed the scan and really she had very tiny nodules . At the given size not much could be done as diagnostic test. The bronchoscopy, of needle biopsy or open biopsy could not have ben done to get tissues diagnosis. The PET scan is good for cancers that are at least 8 mm in size . Sometimes we do get it positive for little smaller but then most of the time it comes back negative and then radiologist states - too small to be picked up on PET scan- and we have spent money and sometimes patients get wrong impression. So we decided to do follow up on CT scan .
I continued to do new scans for 3 more years , which means the renal cancer now was diagnosed 8 years ago. But the last 2 scans were showing some growth - still less than 8 mm. Then the last one was 11 mm -one of the nodules -the one that was growing . I decided that she will need biopsy She was having difficult time with appointment for biopsy and she finally was scheduled for the biopsy.
AND THE BIOPSY SHOWED KIDNEY CANCER !
So the cancer took all most 9 years to recur in lungs . That is why we should call not a cure , but 'disease free time '.