Jun 11, 2013 - 1:48 am
One of the causes of fibrosis in the body is radiation therapy (RT) or chemoradiation therapy (CRT), each used for cancer treatment.
For most patients, fibrosis is scar like tissue that may form during RT/CRT or soon after.
For other patients, who resolve well after RT/CRT, fibrosis may be suddenly experienced years after treatment.
When RT/CRT is given for Head & Neck Cancer (HNC), the fibrosis can cause crucial swallowing problems (Dysphagia).
RT/CRT is often targeted well beyond the tumor location to kill cancer cells that have spread along nerves (perinural spread) &/or to adjacent glands/tissue/ligaments/muscles/bone (local spread) and possibly to the lymph nodes in the neck (regional spread).
Dysphagia usually involves the dysfunction of the epiglottis down to the upper esophageal sphincter (UES).
So why would Dysphagia be a potential problem for people treated for HNC that is not in this area?
The answer is the width & intensity of the RT/CRT treatment fields and that comes down to cancer staging & grading ie cell type of the individual situation.
Stage (I to IV, with increasing subsections) is the standardized measure of how advanced any cancer is & Grade (I to III ie Low, Intermediate or High) is the standardized measure of how aggressive any cancer is.
In 2006 I was diagnosed with a Stage IVB2, Grade (mixed) tumor of the parotid gland ie a very advanced & a highly aggressive parotid gland cancer.
My RT was thus similarly aggressive in width & intensity; it took in areas down to the UES.
After recovering from the RT, I had no Dysphagia at all.
In 2012, more than 6 years out from RT, I ordered a roast dinner and started to gag when I tried to swallow. I was later diagnosed with severe Dysphagia due to permanent fibrosis from the late effects of RT.
I have had to return to pureed food, medical drinks, intensive speech pathology exercises, future repeated UES dilation procedures, experimental antioxidant therapy & possibly UES surgery, all to avoid Nasogastric (NG) tubefeeding or finally Percutaneous Endoscopic Gastrostomy (PEG) tube feeding for life.
I have been told that the patients that are most likely to develop fibrosis & Dysphagia are bilaterally irradiated patients of the Oropharynx (Base of the Tongue) & Larynx.
Oropharyngeal Cancer Treatment
Laryngeal Cancer Treatment
My guess is that the HNC people at risk are those with higher Stage (number?) scores only. The dysphagia could range from mild to severe.
There is no reversal treatment for fibrosis & also xerostomia markedly increases.
My six years of surviving well have now become surviving poorly for life.
Sudden Late Onset Radiation Induced Fibrosis can occur well beyond the normal post-RT surveillance time, when contact with one’s radiation oncologist has ceased.
I have been in communication with two other people with sudden Late Onset Radiation Induced Fibrosis (Dysphagia); suddenly affected 14 years & 24 years after RT/CRT!
People such as these often live a reclusive, low quality life.
They have been successfully treated for cancer & then forgotten about.
Their struggle is to survive survivorship!
The problem is that longitudinal statistics of late onset fibrosis, beyond a patient’s surveillance period, are not collected by radiation oncologists & the condition often goes under-reported.
Mortality takes precedence over morbidity in cancer treatment.
Most HNC patients know of only one significant post-RT/CRT morbidity ie Osteoradionecrosis (ORN); unfortunately Late Onset Radiation Induced Dysphagia is another significant one.
The only statistics that I have ever seen are from the small sample in:
Abstracts for the Tri-Society Head and Neck Oncology Meeting, Singapore, 1-3 September 2011.
Surviving survivorship: the challenge of late onset dysphagia
See page 9 of the abstract:
These statistics were collected in a survey done by a small public referral hospital in Sydney Australia, of patients from surrounding larger public treatment hospitals, 2-8 years following RT/CRT for HNC.
Private hospitals in Australia treat the more common cancers only.
The most interesting paper that I have found is:
Dysphagia After Radiotherapy for Head and Neck Cancer June 2010
Susan E. Langmore and Gintas P. Krisciunas
“Alternatively, those who experience a sudden (later) onset may have had an experience (trauma or surgery, addition of co-morbidity, exhaustion of compensatory mechanisms) that resulted in the addition of extra TGF-β (transforming growth factor beta), or a suppression of that threshold, thereby triggering the aberrant wound healing process.”
See the abstract:
The lesson is:
Report a sudden & increasing swallowing problem for immediate diagnosis & action; albeit that treatment is limited at this stage.
It may never happen to you or may happen to you only mildly.
Fibrosis is the silent, second significant morbidity related to RT/CRT, particularly of the head & neck.