The impact of pre-treatment smoking status on survival after chemoradiotherapy for locally advanced non-small-cell lung cancer

INTRODUCTION

Smoking is a risk factor for the development of lung cancer and reduces life expectancy within the general population. Retrospective studies suggest that non-smokers have better outcomes after treatment for lung cancer. We used a prospective database to investigate relationships between pre-treatment smoking status and survival for a cohort of patients with stage III non-small-cell lung cancer (NSCLC) treated with curative-intent concurrent chemoradiotherapy (CRT).

METHODS

All patients treated with CRT for stage III NSCLC at a major metropolitan cancer centre were prospectively registered to a database. A detailed smoking history was routinely obtained at baseline. Kaplan-Meier statistics were used to assess overall survival and progression-free survival in never versus former versus current smokers.

RESULTS

Median overall survival for 265 eligible patients was 2.21 years (95 % Confidence Interval 1.78, 2.84). It was 5.5 years (95 % CI 2.1, not reached) for 25 never-smokers versus 1.9 years (95 % CI 1.5, 2.7) for 182 former smokers and 2.2 years (95 % CI 1.3, 2.7) for 58 current smokers. Hazard ratio for death was 2.43 (95 % CI 1.32-4.50) for former smokers and 2.75 (95 % CI 1.40, 5.40) for current smokers, p = 0.006. Actionable tumour mutations (EGFR, ALK, ROS1) were present in more never smokers (14/25) than former (9/182) or current (3/58) smokers. TKI use was also higher in never smokers but this was not significantly associated with superior survival (Hazard ratio 0.71, 95 % CI 0.41, 1.26).

CONCLUSIONS

Never smokers have substantially better overall survival than former or current smokers after undergoing CRT for NSCLC.

Validation of the bladder neck as an important organ at risk in prostate seed brachytherapy based on D2cc: A single-institution, retrospective review

Purpose

International guidelines recommend urethral dose volume constraints to minimize the risk of urinary toxicity after prostate brachytherapy. An association between dose to the bladder neck (BN) and toxicity has previously been reported, and we sought to evaluate the impact of this organ at risk on urinary toxicity, based on intra-operative contouring.

Material and methods

Rates of acute and late urinary toxicity (AUT and LUT, respectively) were graded according to CTCAE version 5.0 for 209 consecutive patients who underwent low-dose-rate (LDR) brachytherapy monotherapy, with approximately equal numbers treated before and after we began routinely contouring the BN. AUT and LUT were compared in patients treated before and after we began contouring the OAR, and also for those treated after we began contouring who had a D2cc of greater than or less than 50% prescription dose.

Results

AUT and LUT fell after intra-operative BN contouring was instituted. Rates of grade ≥ 2 AUT fell from 15/101 (15%) to 9/104 (8.6%), p = 0.245. Grade ≥ 2 LUT decreased from 32/100 (32%) to 18/100 (18%), p = 0.034. Grade ≥ 2 AUT was observed in 4/63 (6.3%) and 5/34 (15%) of those with a BN D2cc >/≤ 50%, respectively, of prescription dose. Corresponding rates for LUT were 11/62 (18%) and 5/32 (16%).

Conclusions

There were lower urinary toxicity rates for patients treated after we commenced routine intra-operative contouring of the BN. No clear relationship was observed between dosimetry and toxicity in our population.

Efficacy and toxicity of primary re-irradiation for malignant spinal cord compression based on radiobiological modelling: a phase II clinical trial

BACKGROUND

The efficacy and safety of primary re-irradiation for MSCC are not known. Our aim was to establish the efficacy and safety of biologically effective dose-based re-irradiation.

METHODS

Patients presenting with MSCC at a previously irradiated spine segment, and not proceeding with surgical decompression, were eligible. A 3 Gray per fraction experimental schedule (minimum 18 Gy/6 fractions, maximum 30 Gy/10 fractions) was used, delivering a maximum cumulative spinal dose of 100 Gy2 if the interval since the last radiotherapy was within 6 months, or 130 Gy2 if longer. The primary outcome was a change in mobility from week 1 to week 5 post-treatment, as assessed by the Tomita score. The RTOG SOMA score was used to screen for spinal toxicity, and an MRI performed to assess for radiation-induced myelopathy (RIM).

RESULTS

Twenty-two patients were enroled, of whom eleven were evaluable for the primary outcome. Nine of eleven (81.8%) had stable or improved Tomita scores at 5 weeks. One of eight (12.5%) evaluable for late toxicity developed RIM.

CONCLUSIONS

Re-irradiation is an efficacious treatment for MSCC. There is a risk of RIM with a cumulative dose of 120 Gy2.

CLINICAL TRIAL REGISTRATION

Cancer Trials Ireland (ICORG 07-11); NCT00974168.

P14.35 The modern management of brain metastases

BACKGROUND

Technological and clinical advances have improved outcomes for patients with brain metastases. They have also added significantly to the complexity of decision-making in such cases. We set out to review the roles of different treatment options to guide management for patients with newly-diagnosed brain metastases.

MATERIAL AND METHODS

We undertook a comprehensive literature review to examine all treatment options for brain metastases. We particularly focused on recent advances and where these can be applied to clinical practice.We examined the impact of the improvement of SRS technology from older frame-based setups to modern linear accelerator based treatment with the capacity for fractionated stereotactic radiotherapy (SRT). We identified clinical situations where either SRS or WBRT, or a combination of the two, should be most strongly considered. Several novel targeted systemic therapies cross the blood-brain-barrier so we have explored their outcomes for patients with brain metastases from BRAF-mutated melanoma and EGFR or ALK/ROS1 mutated NSCLC. By examining these techniques in detail, we have formulated an algorithm-based approach which can inform management.

RESULTS

Surgery is most beneficial in patients with a reasonable prognosis and where other treatment options are unlikely to provide equivalent control. SRS to the surgical cavity can frequently be used alone for post-operative consolidation. SRS and fractionated SRT are valuable treatment options for increasingly large lesions and for increasing numbers of lesions. The choice between SRS and WBRT is, in many cases, a trade-off between the improved intracranial control of WBRT and the more favourable side effect profile of SRS. Upfront therapy with some systemic agents with CNS penetration is an acceptable approach in carefully-selected patients whose outcome is felt to be more related to their extracranial disease. Best supportive care is preferable for many patients with poor performance status and/or short prognosis, although more aggressive measures have a role in the case of symptomatic lesions.

CONCLUSION

A multidisciplinary approach involving Neurosurgeons, and both Radiation and Medical Oncologists is needed to fully evaluate the options for individual patients. As many of the treatment decisions are a trade-off between quality of life and outcome metrics, shared decision-making with patients is also critical to ensure that patients receive the best treatment for them.