Laryngeal cancer: United Kingdom National Multidisciplinary guidelines

This is the official guideline endorsed by the specialty associations involved in the care of head and neck cancer patients in the UK. Significantly new data have been published on laryngeal cancer management since the last edition of the guidelines. This paper discusses the evidence base pertaining to the management of laryngeal cancer and provides updated recommendations on management for this group of patients receiving cancer care.

## Recommendations
- or open partial surgical procedures  post-operative RT, may be also be appropriate in selected cases. (R) - In the absence of clinical or radiological evidence of nodal disease, elective treatment (RT or surgery  postoperative RT) is recommended to at least lymph node levels II, III and IV bilaterally. In node positive disease, it is recommended that lymph node levels II-V should be treated on the involved side. If level II nodes are involved, then elective irradiation of ipsilateral level Ib nodes may be considered. (R) - Most patients with T3 supraglottic cancers are suitable for non-surgical larynx preservation therapies. (R) - Concurrent chemoradiotherapy should be regarded as the standard of care for non-surgical management. (R) - Subject to the availability of appropriate surgical expertise and multi-disciplinary rehabilitation services, TLM or open partial surgical procedures  post-operative RT, may also be appropriate in selected cases. (R) - In the absence of clinical or radiological evidence of nodal disease, elective treatment (RT or surgery  postoperative RT) is recommended to at least lymph node levels II, III and IV bilaterally. In node positive disease, lymph node levels II-V should be treated on the involved side. (R) - As per the PET-Neck clinical trial, patients with N2 or N3 neck disease who undergo treatment with chemoradiotherapy to their laryngeal primary and experience a complete response with a subsequent negative post-treatment positron emission tomography combined with computed tomography (PET-CT) scan do not require an elective neck dissection. In contrast, patients who have a partial response to treatment or have increased uptake on a post-treatment PET-CT scan should have a neck dissection. (R) - Larynx preservation with concurrent chemoradiotherapy should be considered for T4 tumours, unless there is tumour invasion through cartilage into the soft tissues of the neck, in which case total laryngectomy yields better outcomes. (R) - In the absence of clinical or radiological evidence of nodal disease, elective treatment (RT or surgery  postoperative RT) is recommended to bilateral lymph node levels II, III, IV, V and VI. (R)

# Introduction
The aim of any clinician involved in the treatment of laryngeal squamous cell carcinoma should be to cure the disease whilst maintaining maximal laryngeal function. Whilst this seems a simple concept, deciding how best to achieve this aim in any given patient is often difficult and results in well-rehearsed complex discussions within multi-disciplinary team (MDT) meetings throughout the UK on a regular basis. Underpinning this lack of clinical certainty is a lack of level I evidence, particularly with respect to the comparative merits of surgical and non-surgical treatment modalities. Thus, for most laryngeal tumours, perceived treatment equipoise exists. In light of this dearth of good quality comparative data, what treatment any given patient receives is typically related to local MDT dynamics and clinical resources. Although we are unable to rectify this lack of evidence, in this document we highlight the treatment options available for any given tumour and attempt, based on published evidence, to highlight the relative merits or disadvantages of each approach.
During 2011, 2360 patients were diagnosed with laryngeal carcinoma in the UK. Of these, 1506, 108, 245 and 73 were diagnosed in England, Wales, Scotland and Northern Ireland, respectively. Accordingly, European Age Standardised Rates per 100 000 for England, Wales, Scotland and Northern Ireland are 2.7, 3.0, 4.2 and 4.3, respectively; highlighting the fact that larynx cancer is more common in Wales, Scotland and Northern Ireland. For the UK as a whole, 1932 (82 per cent) cases occurred in men and 428 (18 per cent) in women (M:F; 4.5:1). Larynx cancer accounts for 1 per cent of all cancers in men and 0.3 per cent of all cancers in women. However, this amounts to a 22 per cent reduction of cases diagnosed in men when comparing 1992-1994 with 2009-2011. A comparable reduction (19 per cent) has occurred in women over this timeframe.
(http://info.cancerresearchuk.org/cancerstats/types/larynx) in keeping with the geographical variation in incidence, larynx cancer is more commonly diagnosed in patients of lower socio-economic groups. [bib_ref] Survival from cancer of the larynx in England and Wales up to, Rachet [/bib_ref] It is well documented that alcohol and tobacco, separately and synergistically are the main causes of larynx cancer. However, in contrast to oropharynx cancer, it appears that human papilloma virus infection is not a major cause. [bib_ref] Squamous cell carcinoma of the head and neck outside the oropharynx is..., Upile [/bib_ref] Larynx cancer is rare in patients younger than 40 years of age, with incidence increasing with age, rising to a peak in the eighth decade. Three-quarters of all diagnoses occur in patients older than 60 years. (http://info. cancerresearchuk.org/cancerstats/types/larynx) In 2012, 618 men (79 per cent) and 166 women (21 per cent) died of larynx cancer (M:F; 3.7:1). This constitutes a marked decrease -25 and 16 per cent, respectivelyin age-standardised mortality for men and women over the last decade. (http://info.cancerresearchuk.org/cancerstats/types/larynx) However, Rachet et al. [bib_ref] Survival from cancer of the larynx in England and Wales up to, Rachet [/bib_ref] previously demonstrated a startling differential mortality rate between socio-economic groups, with patients from lower socio-economic groups suffering higher death rates from larynx cancer than those from higher socio-economic groups.

## Clinical presentation
The clinical presentation of laryngeal cancer is highly variable and depends on the site and size of the primary tumour. Tumours of the glottis, for example, typically present at an early stage as they manifest as hoarseness. In comparison, tumours of the supraglottis are likely to present later with symptoms of pain, hoarseness or swallowing difficulty. However, it is not uncommon for patients presenting with laryngeal cancer to delay seeking medical advice on developing 'early' symptoms, only to present at a much later stage with symptoms of pain, swallowing difficulty, a palpable neck mass or even, in extreme cases, with airway compromise.

## Assessment and staging
As with all head and neck cancers, diagnosis of laryngeal cancer relies initially on good history taking and clinical examination in the clinic. Laryngeal cancers are, in most cases, obvious following inspection of the larynx with a fibreoptic laryngoscope in the outpatient department. Initial assessment of the tumour stage relies on imaging. Whilst exact protocols vary according to local imaging preferences, it is typical for patients suspected of having laryngeal cancer to undergo either magnetic resonance imaging or computed tomography (CT) of the head and neck and CT scan of the thorax and upper abdomen. The exception to this is in patients presenting with the early stage, T1 lesions of the glottis without anterior commissure involvement, where imaging is unhelpful. Definitive diagnosis is achieved by histological examination of a tissue biopsy, obtained usually at the time of a general anaesthetic endoscopic examination of the larynx, pharynx and upper oesophagus. The examination under anaesthesia is extremely important for staging and should routinely involve inspection with rigid (plane 0and angled 30and/or 70) fibreoptic endoscopes. The aggregate information provided by the imaging and the endoscopic examination facilitates the staging of the tumour according to the tumour-nodemetastasis (TNM) system outlined below . It is by recourse to the TNM stage of the tumour, in addition to the general fitness of the patient, that treatment decisions are ultimately made.

## Management
Early (T1-T2a) glottic carcinoma Early laryngeal cancer (T1-T2a N0 M0) is characterised by low tumour volume and a low incidence of metastatic neck disease. Consequently, the chances of cure are extremely good whichever of the main treatment optionsradiotherapy (RT), transoral laser microsurgery (TLM) or open partial laryngeal surgeryis employed. A systemic review 3 has confirmed there is insufficient evidence to determine which of these three treatment options is most effective for the treatment of early glottic carcinoma.
Radiotherapy with surgery in reserve or TLM are the two most commonly used treatment modalities in the UK. Whilst survival outcomes and local control rates are similar, [bib_ref] Impact of anterior commissure involvement on local control of early glottic carcinoma..., Steiner [/bib_ref] they have not been compared in randomised trials. Individual treatment selection depends on patient and tumour factors (e.g. indistinct tumours diffusely infiltrating the vocal fold mucosa and larger volume tumours involving the anterior commissure may be more suitable for RT than transoral laser surgery) and local expertise. Single-modality treatment is sufficient and combining surgery with RT should be avoided as functional outcomes (and perhaps survival in the context of incompletely resected tumour) may be compromised by combined-modality therapy. Radiotherapy is delivered using megavoltage photons from a linear accelerator (typical energies 4-6 MV); hypofractionated RT schedules, using a fraction size greater than 2 Gray (Gy), results in equivalent outcomes to longer schedules, without increased toxicity. Typical schedules include 50-52 Gy in 16 fractions and 53-55 Gy in 20 fractions over three to four weeks. [bib_ref] Three weeks radiotherapy for T1 glottic cancer: the Christie and Royal Marsden..., Gowda [/bib_ref] Elective treatment of the neck is not recommended because of the very low risk of occult nodal disease. Radiotherapy results in significant acute toxicity, including thick, sticky secretions, hoarse voice, odynophagia and skin reactions. Most of these effects resolve four to six weeks after the completion of treatment and significant late effects are rare. Should tumour recurrence occur, partial laryngeal surgery provides a salvage option in appropriate clinical settings, resulting in good oncological and functional outcomes. However, these techniques are rarely offered in the UK and, therefore, total laryngectomy is most commonly performed.
Transoral laser microsurgery is usually undertaken using a CO 2 laser as a day case procedure and has minimal acute morbidity. Whilst there is equipoise with respect to voice outcome between RT and TLM for smaller tumours, long-term quality of voice for T2 glottic cancers is generally accepted to be better after RT than after TLM. Voice outcome following TLM is dependent on the extent of the resection and/ or whether the resection includes the anterior commissure. [bib_ref] Impact of anterior commissure involvement on local control of early glottic carcinoma..., Steiner [/bib_ref] Certain patient factors, may preclude TLM, such as restriction of neck movement and difficult access. In these patients, hypofractionated RT is the preferred option.
Contrary to the practice in other countries, in the UK, partial open surgical procedures are used less commonly for the treatment of early de novo glottic carcinoma. However, they provide an option for the treatment of de novo tumours which are not accessible to TLM and for recurrent tumours after TLM or RT. Meta-analysis data show similar rates of local control and survival after partial laryngectomy Tumour invades mucosa of more than one adjacent subsite of supraglottis or glottis or region outside the supraglottis (e.g. mucosa of base of tongue, vallecula, medial wall of piriform sinus) without fixation of the larynx T3
Tumour limited to larynx with vocal fold fixation and/or invades any of the following: post-cricoid area, pre-epiglottic tissues, paraglottic space, and/or with minor thyroid cartilage erosion (e.g. inner cortex) T4a
Tumour invades through the thyroid cartilage and/or invades tissues beyond the larynx, e.g. trachea, soft tissues of neck, including deep/extrinsic muscle of tongue (e.g. genioglossus, hyoglossus, palatoglossus and styloglossus), strap muscles, thyroid and oesophagus T4b
Tumour invades pre-vertebral space, mediastinal structures or encases carotid artery Glottis T1 Tumour limited to vocal fold(s) (may involve anterior or posterior commissure) with normal mobility T1a. Tumour limited to one vocal fold T1b. Tumour involves both vocal folds T2
T2a. Tumour extends to supraglottis and/or subglottis with normal vocal fold mobility T2b. Tumour extends to supraglottis and/or subglottis with impaired vocal fold mobility T3
Tumour limited to larynx with vocal fold fixation and/or invades paraglottic space, and/or with minor thyroid cartilage erosion (e.g. inner cortex) T4a
Tumour invades through the thyroid cartilage or invades tissues beyond the larynx, e.g. trachea, soft tissues of neck, including deep/extrinsic muscle of tongue (genioglossus, hyoglossus, palatoglossus and styloglossus), strap muscles, thyroid and oesophagus T4b
Tumour invades prevertebral space, mediastinal structures or encases carotid artery Subglottis T1 Tumour limited to subglottis T2
Tumour extends to vocal fold(s) with normal or impaired mobility T3
Tumour limited to larynx with vocal fold fixation T4a
Tumour invades through cricoid or thyroid cartilage and/or invades tissues beyond the larynx, e.g., trachea, soft tissues of neck including deep/extrinsic muscle of tongue (genioglossus, hyoglossus, palatoglossus and styloglossus), strap muscles, thyroid and oesophagus T4b
Tumour invades prevertebral space, mediastinal structures or encases carotid artery RT) with larynx preservation rates of 98.3 per cent for de novo tumours and 84.6 per cent for radio-recurrent tumours. [bib_ref] Open Conservation partial Laryngectomy for laryngeal cancer: a Systematic review of English..., Thomas [/bib_ref] [bib_ref] Oncologic outcomes of open conservation laryngectomy for radiorecurrent laryngeal carcinoma: a systematic..., Paleri [/bib_ref] Open surgical procedures include laryngofissure cordectomy, vertical partial laryngectomy (VPL)  reconstruction, frontolateral vertical partial laryngectomy, supraglottic laryngectomy, supracricoid partial laryngectomy plus cricohyoidoepiglottopexy or cricohyoidopexy reconstruction (SCPL-CHEP or CHP) and extended supraglottic laryngectomy.
Overall, for T1a glottic tumours the local control is similar between RT and TLM (five-year local control rate 90-93 per cent). In the case of T1b disease, the local control rate is lower .
Similarly, the local control and overall survival rates for T2a glottic cancers are comparable when treated with TLM, partial laryngeal resection or RT. ise and multi-disciplinary support services. Survival outcomes appear to be similar with RT and surgery although, once again, there are no randomised comparative data. Whilst long-term functional (voice and swallowing) outcomes appear similar, early swallowing function is usually poorer after surgery: swallowing rehabilitation may be prolonged and in a small proportion of patients, adequate swallowing function may never be achieved. Consequently, patient selection, based on tumour burden and performance status, is imperative. Again, every effort should be made to avoid combining surgery with RT because functional outcomes may be compromised by combined-modality therapy. The supraglottis has a rich lymphatic supply and, as a consequence, the risk of nodal disease is significantly higher for T1-T2 supraglottic cancers than for T1-T2 glottic cancers. Thus, even in the absence of clinical or radiological evidence of nodal involvement, elective treatment of at least bilateral lymph node levels II and IIIeither with RT or selective neck dissectionis recommended.

## Recommendations
Whilst RT or surgery alone, is sufficient for the treatment of node negative T1-T2 supraglottic cancers, concurrent platinum-based chemoradiotherapy or surgery followed by post-operative RT is recommended for node positive supraglottic carcinoma (T1-T2 N1+, stage III-IV) in patients whose performance status is sufficient to tolerate this treatment. The role of induction chemotherapy prior to chemoradiotherapy or surgery remains unclear but may be appropriate for patients presenting with advanced nodal disease (e.g. N2c/N3), particularly if this is rapidly progressive and/or symptomatic.
All treatment options appear to effect similar locoregional control and survival rates: For T1 disease, five-year local control rates following treatment with RT, TLM, TORS or open supraglottic laryngectomy range from 77 to 100 per cent. For T2 tumours, the five-year local control rates range from 80 to 97 per cent for TLM or open supraglottic laryngectomy and from 62 to 83 per cent for primary RT. 8

## Recommendations
- Radiotherapy, transoral laser microsurgery and transoral robotic surgery are reasonable treatment options for T1-T2 supraglottic carcinoma (R) - Supraglottic laryngectomy may have a role in the management of selected tumours (R)

## T2b-t3 glottic tumours
Most patients with T2b-T3 glottic cancers are suitable for radiation-based larynx preservation therapy. However, subject to the availability of appropriate surgical expertise and multi-disciplinary rehabilitation services, TLM or open partial surgical procedures  post-operative RT, may also be appropriate in selected cases. Open partial surgical procedures which might be considered include VPL  reconstruction, frontolateral VPL, supraglottic laryngectomy, SCPL-CHEP or CHP and extended supraglottic laryngectomy. In the absence of clinical or radiological evidence of nodal disease, elective treatment (RT or surgery  post-operative RT) is recommended to at least lymph node levels II, III and IV bilaterally, because of the risk of occult nodal metastasis. Intensity-modulated radiotherapy (IMRT) allows a convenient solution to elective nodal treatment, enabling differential doses of RT to be given to different nodal groups simultaneously, depending on the presence or absence of macroscopic disease and the risk of subclinical disease. In node positive disease, it is recommended that lymph node levels II-V should be treated on the involved side. If level II nodes are involved, then elective irradiation of ipsilateral level Ib nodes may be considered.
The potential of RT and chemotherapy for larynx preservation was established by the landmark Veterans Affairs Laryngeal Cancer Study Group (VALCSG) study 9 in which induction chemotherapy and RT (IC + RT) yielded similar overall survival (68 per cent at two years) to laryngectomy followed by adjuvant RT for stage III-IV laryngeal cancer with high rates of larynx preservation (64 per cent at two years). Rates of salvage laryngectomy were significantly lower for T3 vs T4 disease (29 per cent vs 56 per cent, p = 0.001). Subsequently, the RTOG (Radiation Therapy Oncology Group) 91-11 trial 10 demonstrated that concurrent chemoradiotherapy was superior to IC + RT and RT alone in terms of laryngeal preservation (88 vs 75 vs 70 per cent, respectively, at three years), although overall survival in each treatment arm was similar. Of note, 10-year follow-up data have confirmed the superiority of concurrent chemoradiotherapy, but a significant increase in non-cancer deaths in the group treated with chemoradiotherapy was reported. [bib_ref] Long-term results of RTOG 91-11: a comparison of three nonsurgical treatment strategies..., Forastiere [/bib_ref] The use of concurrent chemoradiotherapy for locally advanced head and neck cancers, including laryngeal cancers, is also supported by meta-analysis data. [bib_ref] Meta-analysis of chemotherapy in head and neck cancer (MACH-NC): an update on..., Pignon [/bib_ref] Standard concurrent chemotherapy regimens include cisplatin (100 mg/m 2 ) on days 1, 22 and 43 of RT and carboplatin/5-FU on weeks 1 and 5 of RT.
Concurrent chemoradiotherapy is, however, associated with a significant increase in acute and late toxicity compared with RT alone. The long-term side effects of chemoradiotherapy are well documented: 43 per cent of patients develop severe (grade III/IV) late toxicity, including a reduction in speech and swallowing function which can lead to life-long dependence on a feeding tube (13 per cent of patients two years after treatment) and have a profound effect on quality of life (QoL). [bib_ref] Factors associated with severe late toxicity after concurrent chemoradiation for locally advanced..., Machtay [/bib_ref] (Although these late severe toxicities are likely to affect fewer patients when contemporary RT delivery schedules are used.) Older age, advanced T stage, larynx/hypopharynx primary site and neck dissection after chemoradiotherapy all increase the risk of severe late toxicity after chemoradiotherapy and the additional benefit of chemotherapy must be balanced against the risks for individual patients. The benefit of chemotherapy decreases with age and is non-significant above 70 years of age. Thus, its use may be less appropriate in older patients. Other systemic therapies that may be given concurrently with RT include cetuximab, a monoclonal antibody which competitively inhibits the cell-surface epidermal growth factor receptor. Cetuximab has been shown to improve locoregional control (three-year LRC 47 vs 34 per cent, p < 0.01) and overall survival (by 10 per centthree-year OS 55 vs 45 per cent) over RT alone in a study of patients with locally advanced (stage III/ IV) head and neck cancer (27 per cent of whom had laryngeal cancer). The benefit was maintained on longer follow-up (five-year OS 46 vs 36 per cent). 14 Toxicities of cetuximab include an acneiform rash and hypersensitivity reactions but it does not increase the rate of severe radiation-related mucositis. It is an alternative to concurrent chemoradiotherapy for patients with laryngeal cancer who cannot receive concurrent chemoradiotherapy, as per the guidelines published in 2008 by the National Institute for Health and Care Excellence (http://www.nice.org.uk/guidance/ta145).
Induction chemotherapy with cisplatin and 5-FU (PF) prior to RT may also improve survival, [bib_ref] End points for new agents in induction chemotherapy for locally advanced head..., Monnerat [/bib_ref] but the benefit of induction chemotherapy prior to standard concurrent chemoradiotherapy schedules is currently unproven. If induction chemotherapy is used, taxane (docetaxel or paclitaxel) in combination with cisplatin and 5-FU has been shown to be superior to PF doublet chemotherapy in a meta-analysis of five randomised trials. [bib_ref] Taxane-cisplatin-fluorouracil as induction chemotherapy in locally advanced head and neck cancers: an..., Blanchard [/bib_ref] Radiotherapy may be used as a single modality where comorbidity precludes the use of concurrent chemotherapy, cetuximab or surgery. Conventional RT alone may be suboptimal for the treatment of advanced laryngeal cancer. Altered fractionation regimens (including acceleration and hyperfractionation) improve locoregional control and overall survival compared with standard fractionated RT for head and neck cancer patients who elect or are selected to receive RT alone (albeit at the cost of higher mucosal toxicity). [bib_ref] Hyperfractionated or accelerated radiotherapy in head and neck cancer: a meta-analysis, Bourhis [/bib_ref] However, altered fractionation regimens do not appear to improve outcome compared with or when combined with concurrent chemoradiotherapy which should be regarded as the 'standard of care' for the non-surgical management of advanced laryngeal cancer. Accelerated fractionation with hypoxia modification using either nimorazole or carbogen/nicotinamide shows promising results and requires further study. To that end, the UK clinical trial NIMRAD (a randomised placebo-controlled trial of synchronous NIMorazole vs RADiotherapy alone in patients with locally advanced head and neck squamous cell carcinoma not suitable for synchronous chemotherapy or Cetuximab) (NCT01950689) is currently recruiting in several UK centres.
It is important to note that, despite the laryngeal preservation and survival rates conferred by non-surgical strategies, there is a dearth of robust data relating to laryngeal function after chemoradiotherapy. By comparison with non-surgical treatments, any larynxpreserving surgical procedure -TLM or partial open procedureundertaken for T2b/T3 carcinoma of the larynx will result in dysphonia and prolonged swallowing rehabilitation. Although most patients appear to achieve satisfactory swallowing function eventually, a small percentage of patients will require a total laryngectomy for functional reasons.
Whilst TLM or partial open surgical procedures may be considered as an alternative to non-surgical treatment for selected cases in appropriate centres, laryngectomy may be preferred for patients with significant preexisting laryngeal destruction by tumour and/or a pretreatment tracheostomy; however, reports of whether a pre-treatment tracheostomy negatively affects outcome after RT are conflicting and concurrent chemoradiotherapy remains an option for these patients (25 per cent of patients in the VALCSG study 9 had a baseline tracheostomy and they were not excluded from RTOG 91-11).
Vocal cord fixation is not a contraindication to larynx preservation (for either surgical or non-surgical modalities), although it is likely that these patients will have a poorer functional and oncological outcome than patients with mobile vocal folds.
In the absence of clinical or radiological evidence of nodal disease, elective treatment (RT or surgery  post-operative RT) is recommended to at least lymph node levels II, III and IV bilaterally.

## Recommendations
- Most patients with T2b-T3 glottic cancers are suitable for non-surgical larynx preservation therapies (R) - Concurrent chemoradiotherapy should be regarded as the standard of care for nonsurgical management (R) - Subject to the availability of appropriate surgical expertise and multi-disciplinary rehabilitation services, TLM or open partial surgical procedures  post-operative RT, may also be appropriate in selected cases (R) - In the absence of clinical or radiological evidence of nodal disease, elective treatment (RT or surgery  post-operative RT) is recommended to at least lymph node levels II, III and IV bilaterally. In node positive disease, it is recommended that lymph node levels II-V should be treated on the involved side. If level II nodes are involved, then elective irradiation of ipsilateral level Ib nodes may be considered (R)

## T3 supraglottic carcinoma
The principles of organ preservation for T3 supraglottic cancers are the same as for glottic cancers. Tumour size, pre-treatment laryngeal function and performance status should direct the management of individual patients. Rates of salvage laryngectomy after surgical and non-surgical treatment of supraglottic cancers are lower than for glottic cancers. Vocal cord function is usually well preserved following TLM or supraglottic laryngectomy; however, rehabilitation of swallowing function following supraglottic surgery may be prolonged and, whilst most patients achieve satisfactory swallowing function, this cannot be guaranteed. T3 supraglottic cancers have a significantly higher risk of nodal disease (occult and clinical) than glottic tumours and this must be taken into account when considering how to manage the neck. In the absence of clinical or radiological evidence of nodal disease, elective treatment -RT and/or selective neck dissectionis recommended to at least lymph node levels II, III, IV bilaterally.
There is general agreement that chemoradiotherapy is sufficient to treat early nodal disease (N1, single lymph node <3 cm) in patients with glottic cancers. Since publication of the last edition, management of N2 (multiple lymph nodes and/or >3-6 cm) or N3 (>6 cm) nodal disease has been informed by the PET-Neck clinical trial. [bib_ref] PETCT surveillance versus neck dissection in advanced head and neck cancer, Mehanna [/bib_ref] The data confirm that positron emission tomography combined with computed tomography (PET-CT) surveillance of the neck in chemoradiotherapy complete responders, obviates the need for an elective neck dissection in patients with a negative PET-CT scan result.

## Recommendations
- Most patients with T3 supraglottic cancers are suitable for non-surgical larynx preservation therapies (R) - Concurrent chemoradiotherapy should be regarded as the standard of care for nonsurgical management (R) - Subject to the availability of appropriate surgical expertise and multi-disciplinary rehabilitation services, TLM or open partial surgical procedures  post-operative RT, may also be appropriate in selected cases (R) - In the absence of clinical or radiological evidence of nodal disease, elective treatment (RT or surgery  post-operative RT) is recommended to at least lymph node levels II, III and IV bilaterally. In node positive disease, lymph node levels II-V should be treated on the involved side (R) - As per the PET-Neck clinical trial, patients with N2 or N3 neck disease who undergo treatment with chemoradiotherapy to their laryngeal primary and experience a complete response with a subsequent negative post-treatment PET-CT scan do not require planned neck dissection. In contrast, patients who have a partial response to treatment or have increased uptake on a post-treatment PET-CT scan should have a neck dissection (R)

## T4 laryngeal carcinoma
Larynx preservation with chemoradiotherapy should be considered for T4 tumours, unless there is tumour invasion through cartilage into the soft tissues of the neck, in which total laryngectomy followed by adjuvant treatment yields better outcomes. The VALCSG studyshowed reduced tumour response to chemotherapy and higher rates of salvage laryngectomy for T4 tumours (56 per cent for T4 vs 29 per cent for T3 tumours, p = 0.001). Nevertheless, larynx preservation can be achieved in a significant proportion of patients with T4 disease, without detriment to survival when salvage laryngectomy is incorporated. However, once again, few data are available correlating laryngeal preservation with function and QoL. Good patient selection is of paramount importance. Patients with large-volume T4 tumoursdefined as extension of tumour through thyroid cartilage or tumour extension greater than 1 cm into the base of tonguewere excluded from RTOG 91-11 10 as they are poor candidates for organ preservation. Patients with significant pre-existing laryngeal destruction by tumour and/or a pre-treatment tracheostomy may also be better suited to a total laryngectomy. Total laryngectomy may confer a better QoL than a preserved, but poorly functioning, larynx. Patients with large-volume T4 tumours who are unsuitable for surgery because of inoperable (T4b) disease have been treated with combined-modality organ preservation therapy with significant rates of disease control (71 per cent at four years) and overall survival (56 per cent at four years) in retrospective studies. Induction chemotherapy may be used to treat large volume, symptomatic disease prior to commencement of concurrent chemoradiotherapy.
Lymph node levels II-V bilaterally should be treated, irrespective of the pre-treatment clinical nodal status. As per the findings of the PET-Neck trial [bib_ref] PETCT surveillance versus neck dissection in advanced head and neck cancer, Mehanna [/bib_ref] (see above), a planned neck dissection is not necessary in patients who experience a complete response to chemoradiotherapy and have a post-treatment negative PET-CT scan. Improved systemic therapies and RT dose intensification using IMRT may improve outcomes for this patient group in future.

## Recommendations
- Larynx preservation with concurrent chemoradiotherapy should be considered for T4 tumours, unless there is tumour invasion through cartilage into the soft tissues of the neck, in which case total laryngectomy yields better outcomes (R) - In the absence of clinical or radiological evidence of nodal disease, elective treatment (RT or surgery  post-operative RT) is recommended to bilateral lymph node levels II, III, IV, V and VI (R)
Post-operative RT /chemoradiotherapy Radiotherapy delivered post-operatively to the primary site and/or neck in patients at high risk of locoregional recurrence can improve locoregional control and survival. Post-operative RT is recommended for pT4 laryngeal cancers of any nodal stage, pT1/T2/T3 tumours with N2-N3 nodal stage and for all patients with close or positive resection margins and/or extracapsular spread; other unfavourable pathological factors, including peri-neurial and vascular invasion, are relative indications for post-operative RT. Administration of concurrent cisplatin chemotherapy with post-operative RT improves locoregional control and disease-free survival compared with post-operative RT alone for locally advanced tumours, [bib_ref] Postoperative irradiation with or without concomitant chemotherapy for locally advanced head and..., Bernier [/bib_ref] [bib_ref] Postoperative concurrent radiotherapy and chemotherapy for high-risk squamous-cell carcinoma of the head..., Cooper [/bib_ref] albeit at the expense of increased mucosal and haematological toxicity and possibly increased deaths. This approach improves overall survival in selected patients, particularly with extracapsular spread and/or positive margins, and should be used selectively for patients at highest risk of relapse.

## Key points
- Approximately 2400 patients are diagnosed with laryngeal squamous cell carcinoma and 800 patients die of the disease per annum in the UK - Early stage tumours of the glottis present with hoarseness, whilst tumours of the supraglottis and more advanced glottic tumours may present with pain, odynophagia and/or dysphagia, a neck lump or even airway compromise - Meticulous endoscopic inspection of the tumour under general anaesthetic and imaging of the head, neck and thorax is needed for staging - Radiotherapy and transoral laser microsurgery are reasonable treatment options for T1a-T2a glottic and T1-T2 supraglottic carcinomas - Most patients with T2b-T3 glottic and T3 supraglottic cancers are suitable for non-surgical larynx preservation therapies. Transoral laser microsurgery or open partial surgical procedures  post-operative radiotherapy may be also be appropriate in selected cases - Concurrent chemoradiotherapy should be regarded as standard of care for the non-surgical management of stage III/IV laryngeal cancer - Patients with N2 or N3 neck disease who experience a complete response with a subsequent negative posttreatment PET-CT scan do not require planned neck dissection - Post-operative (chemo)radiotherapy is recommended in the presence of advanced disease or adverse histological features.
[fig] : Radiotherapy and transoral laser microsurgery are accepted treatment options for T1a-T2a glottic carcinoma (R) Open partial surgery may have a role in the management of selected tumours (R) T1-T2 supraglottic cancers Radiotherapy, TLM and transoral robotic surgery (TORS) are valid treatment options for all patients with T1-T2 supraglottic cancers. As with glottic carcinomas, open partial surgical procedures (supraglottic laryngectomy) are used less commonly in the UK but open supraglottic laryngectomy may have a role in selected cases in units with appropriate surgical expert- [/fig]