Cancer of the larynx or voice box usually begins in the glottis (vocal cords) as a squamous cell cancer (cancer in the membranes). Most people survive these cancers when they get treatment early, before the cancer spreads further into the larynx and surrounding area. Options include radiotherapy, open surgery where access is through the neck or, more commonly now, endolaryngeal excision whereby the throat is reached through the mouth, sometimes with a laser.
This review of trials identified just one trial including 234 patients with early glottic cancer, which compared radiotherapy to open surgery. This was a multicentre randomised controlled trial undertaken in the former Soviet Union, Hungary and Czechoslovakia. Patients were followed up for five years and recurrence-free and survival rates were measured.
The results of this trial showed that there was no significant difference in survival between patients treated with radiotherapy or open surgery.
Further data from trials comparing radiotherapy and endolaryngeal surgery are needed to determine the best way of treating early laryngeal cancer, however a number of studies have been abandoned because of difficulties in recruiting participants. One trial is still ongoing.
We found that there is not enough evidence to show which form of treatment might be better for people with early-stage larynx cancer.
Quality of the evidence
The included study is of low quality. The evidence in this review is up to date to September 2014.
There is only one randomised controlled trial comparing open surgery and radiotherapy but its interpretation is limited because of concerns about the adequacy of treatment regimens and deficiencies in the reporting of the study design and analysis.
This is an update of a Cochrane review first published in The Cochrane Library in Issue 2, 2002 and previously updated in 2004, 2007 and 2010.
Radiotherapy, open surgery and endolaryngeal excision (with or without laser) are all accepted modalities of treatment for early-stage glottic cancer. Case series suggest that they confer a similar survival advantage, however radiotherapy and endolaryngeal surgery offer the advantage of voice preservation. There has been an observed trend away from open surgery in recent years, however equipoise remains between radiotherapy and endolaryngeal surgery as both treatment modalities offer laryngeal preservation with similar survival rates. Opinions on optimal therapy vary across disciplines and between countries.
To compare the effectiveness of open surgery, endolaryngeal excision (with or without laser) and radiotherapy in the management of early glottic laryngeal cancer.
We searched the Cochrane Ear, Nose and Throat Disorders Group Trials Register; the Cochrane Central Register of Controlled Trials (CENTRAL 2014, Issue 8); PubMed; EMBASE; CINAHL; Web of Science; Cambridge Scientific Abstracts; ICTRP and additional sources for published and unpublished trials. The date of the most recent search was 18 September 2014.
Randomised controlled trials comparing open surgery, endolaryngeal resection (with or without laser) and radiotherapy.
We used the standard methodological procedures expected by The Cochrane Collaboration.
We identified only one randomised controlled trial, which compared open surgery and radiotherapy in 234 patients with early glottic laryngeal cancer. The overall risk of bias in this study was high.
For T1 tumours, the five-year survival was 91.7% following radiotherapy and 100% following surgery and for T2 tumours, 88.8% following radiotherapy and 97.4% following surgery. There were no significant differences in survival between the two groups.
For T1 tumours, the five-year disease-free survival rate was 71.1% following radiotherapy and 100.0% following surgery, and for the T2 tumours, 60.1% following radiotherapy and 78.7% following surgery. Only the latter comparison was statistically significant (P value = 0.036), but statistical significance would not have been achieved with a two-sided test.
Data were not available on side effects, quality of life, voice outcomes or cost.
We identified no randomised controlled trials that included endolaryngeal surgery. A number of trials comparing endolaryngeal resection and radiotherapy have terminated early because of difficulty recruiting participants. One randomised controlled trial is still ongoing.