Metastatic feline mammary cancer: prognostic factors,outcome and comparison of different treatment modalities – a retrospective multicentre study

Gonçalo Petrucci, Joaquim Henriques, Hugo Gregório, Gonçalo Vicente, Justina Prada, Isabel Pires, Luís Lobo, Rui Medeiros and Felisbina Queiroga J Feline Med Surg 2021; 23: 549–556.

Readers should note that the version of the article that was published OnlineFirst in October 2020 and which was online until mid-January 2021 has been amended. The version now appearing online and on pages 549–556 of the June 2021 print issue of JFMS is the correct one. For information, the following amendments have been made to the original published version.

In the ‘Results’ section of the abstract, the tumour-specific survival (TSS) for asymptomatic cats should be ‘128 days’ and not ‘120 days’, as stated. The sentence has therefore been amended to ‘Cats with clinical signs at the time of diagnosis had a lower TSS (14 days) than asymptomatic cats (128 days; P <0.001).’

In addition, several values in Table 3 have been amended, and the corrected version of the table is shown below.

Table 3

Median tumour-specific survival (TSS) time for clinical characteristics in 73 cats with metastatic mammary carcinomas

Variable	n = 73	Median TSS(days)	95% CI	Six month cumulative survival (%)	P value*
Metastatic disease
Metastatic	55	39	26–52	13.8	0.048
De novo metastatic	18	128	9–246	38.1
Presence of clinical signs
Symptomatic	39	14	5–23	2.7	<0.001
Asymptomatic	34	128	25–231	38.2
Duration of signs (days)
>5	18	14	0–28	0	0.595
⩽5	21	8	0–30	5.4
Pleural effusion
Yes	25	16	1–30	8	<0.001
No	48	64	46–81	25.5
Location of metastasis
Lungs	63	58	41–75	22.6	0.001
Hepatic	4	21	4–38	0
Multiple	4	1	0–4	0
Skin	2	37	NC	0
Mastectomy after stage IV †
Yes	9	322	105–540	51.4	0.012
No	64	37	21–53	15.1

*

P value for log-rank test (median TSS)

†

Partial mastectomy after stage IV diagnosis with a palliative intent

NC = not computable