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Evaluation of long-term outcome and prognostic factors of feline squamous cell carcinomas treated with photodynamic therapy using liposomal phosphorylated meta-tetra(hydroxylphenyl)chlorine


Flickinger, Irene; Gasymova, Eva; Dietiker-Moretti, Simona; Tichy, Alexander; Rohrer Bley, Carla (2018). Evaluation of long-term outcome and prognostic factors of feline squamous cell carcinomas treated with photodynamic therapy using liposomal phosphorylated meta-tetra(hydroxylphenyl)chlorine. Journal of Feline Medicine and Surgery, 20(12):1100-1104.

Abstract

OBJECTIVES: The aim of this study was to evaluate the efficacy, long-term outcome and prognostic factors of feline squamous cell carcinoma (SCC) treated with photodynamic therapy (PDT).
METHODS: Cats with histologically verified SCC of the head and neck received an intravenous injection of liposomal phosphorylated meta-tetra(hydroxylphenyl)chlorine (mTHPC) and 4 h later 652 nm light was delivered by a diode laser. One group received ⩽10 J/cm2, the other 20 J/cm2. Tumour response and duration were analysed with stage, tumour diameter, location and treatment intensity as prognostic factors.
RESULTS: In total, 63 lesions in 38 cats underwent treatment with ⩽10 J/cm2 (n = 22) and 20 J/cm2 (n = 41). Overall response rate was 84% (complete remission 61%, partial remission 22%) with a mean progression-free interval of 35 months (median not reached) and a median overall survival time of 40 months (95% confidence interval 33-47). With regard to tumour stage, invasiveness yielded a highly significant worse outcome ( P <0.017). All patients with invasive tumours showed progression at less than 6 months. Larger lesions were associated with inferior control and treatment intensity, and tumour location did not influence response and duration.
CONCLUSIONS AND RELEVANCE: PDT using a systemic photosensitiser leads to excellent long-term tumour control in the majority of cats. However, invasive and large tumours had a clearly inferior outcome, even if treated with the higher-dose intensity. This suggests that advanced lesions are not indications for PDT.

Abstract

OBJECTIVES: The aim of this study was to evaluate the efficacy, long-term outcome and prognostic factors of feline squamous cell carcinoma (SCC) treated with photodynamic therapy (PDT).
METHODS: Cats with histologically verified SCC of the head and neck received an intravenous injection of liposomal phosphorylated meta-tetra(hydroxylphenyl)chlorine (mTHPC) and 4 h later 652 nm light was delivered by a diode laser. One group received ⩽10 J/cm2, the other 20 J/cm2. Tumour response and duration were analysed with stage, tumour diameter, location and treatment intensity as prognostic factors.
RESULTS: In total, 63 lesions in 38 cats underwent treatment with ⩽10 J/cm2 (n = 22) and 20 J/cm2 (n = 41). Overall response rate was 84% (complete remission 61%, partial remission 22%) with a mean progression-free interval of 35 months (median not reached) and a median overall survival time of 40 months (95% confidence interval 33-47). With regard to tumour stage, invasiveness yielded a highly significant worse outcome ( P <0.017). All patients with invasive tumours showed progression at less than 6 months. Larger lesions were associated with inferior control and treatment intensity, and tumour location did not influence response and duration.
CONCLUSIONS AND RELEVANCE: PDT using a systemic photosensitiser leads to excellent long-term tumour control in the majority of cats. However, invasive and large tumours had a clearly inferior outcome, even if treated with the higher-dose intensity. This suggests that advanced lesions are not indications for PDT.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:05 Vetsuisse Faculty > Veterinary Clinic > Department of Small Animals
Dewey Decimal Classification:570 Life sciences; biology
630 Agriculture
Uncontrolled Keywords:Small Animals
Language:English
Date:1 December 2018
Deposited On:30 Nov 2018 16:30
Last Modified:24 Sep 2019 23:55
Publisher:Sage Publications Ltd.
ISSN:1098-612X
OA Status:Green
Publisher DOI:https://doi.org/10.1177/1098612x17752196
PubMed ID:29359611

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