2 The procedure
2.1.1 This procedure is used to treat patients with inoperable non-small cell lung cancer, which has a poor prognosis.
2.1.2 Alternative treatments include debulking with biopsy forceps, radiotherapy and laser resection.
2.2.1 Photodynamic therapy (PDT) for advanced bronchial carcinoma is a minimally invasive treatment, usually involving intravenous injection of a photosensitising agent, followed a few days later by photoradiation of the affected area through a bronchoscope. This is intended to reduce the bulk of the tumour, therefore reducing symptoms caused, for example, by bronchial obstruction.
2.3.1 Three small randomised controlled trials (RCTs) were identified, in addition to nonrandomised comparative studies and case series. The two largest randomised studies compared PDT with laser treatment; both studies reported that symptomatic improvement was similar for both treatments. One of these studies reported a mean increase in forced vital capacity of 0.47 litres in the PDT group, compared with a mean decrease of 0.06 litres in the laser group (p < 0.05); and a mean increase in forced expiratory volume in 1 second of 0.35 litres for the PDT group, compared with 0.01 litres for the laser group (p < 0.05). The other study reported median time to treatment failure to be 50 days for the PDT group and 38 days for the laser group, and average survival to be 265 days for the PDT group compared with 95 days for the laser group. For more details, refer to the Sources of evidence section.
2.3.2 The Specialist Advisors noted that it was not clear whether tumour bulk reduction in a palliative setting was associated with gains in quality of life or survival. They also noted that careful patient selection is needed.
2.4.1 The largest RCT reported at least one adverse effect in 100% (14/14) of patients in the PDT group and 71% (12/17) of patients in the laser group. In this study, the most common adverse effects in the PDT group were bronchitis (29%, 4/14); photosensitisation (29%, 4/14); dyspnoea (21%, 3/14); and death (probably related to treatment; 7%, 1/14). For more details, refer to the Sources of evidence section.
2.4.2 The Specialist Advisors generally considered this procedure to be safe. They listed the main potential adverse events as skin photosensitivity, bleeding, necrosis/obstruction, late strictures, oesophago–bronchial fistula formation, and airway occlusion by exudates.