Poster display session: Breast cancer - early stage, locally advanced & metastatic, CNS tumours, Developmental therapeutics, Genitourinary tumours - prostate & non-prostate, Palliative care, Psycho-oncology, Public health policy, Sarcoma, Supportive care Poster Display session

325P - Pertuzumab, Trastuzumab and Taxane combination for Visceral Organ Metastatic Patients: Real Life Practice Results

Presentation Number
325P
Lecture Time
12:45 - 12:45
Speakers
  • Ece Esin (Ankara, TR)
Location
Hall A3 - Poster Area Networking Hub, ICM M√ľnchen, Munich, Germany
Date
22.10.2018
Time
12:45 - 13:45

Abstract

Background

Anti-HER2 agents were a breakthrough in the treatment of HER2-enriched breast cancer (BC). In this study, we aimed to describe the real-life efficacy and safety of pertuzumab-trastuzumab-taxane (PTT) combination in BC patients.

Methods

This study was conducted by the Turkish Oncology Group and reached 35 centers nationwide. 309 visceral metastatic, and trastuzumab naive patients who received first line PTT were included.

Results

Patients' characteristics and treatment details are summarized in the table. Median progression-free survival (PFS) was 28.5 months (95% CI:15.6-41.4), while median overall survival (OS) was 40.3 months (95%CI: 26.9-53.7). Brain metastatic patients (n = 13, 4.2%) had worse PFS (16.8m vs. 28.5m; HR:3.9, 95% CI:1.7-9.2, p = 0.002) and OS (26.7m vs. 40.3m; HR:3.2, 95% CI:1.3-7.6, p = 0.009). Elderly patients (>65y) had significantly lower OS results (19.8m vs. 40.3m; HR:0.4, %95 CI:0.2-0.8, p = 0.01). Docetaxel was the choice in 268 patients (86.7%), while 41 patients (13.3%) received paclitaxel. There was no statistically significant difference in PFS (28.5 m vs. 24.1 m; p = 0.61) and OS (40.3 m vs. NR; p = 0.17) between taxane groups. Additionally, ≥10 cycles of docetaxel were not associated with improvement in outcomes compared with 6-10 cycles. One treatment-related death due to sepsis was noted. In 8 patients (2.6%), 5-40% ejection fraction decrease from baseline was detected without any sign of heart failure.

Demographic characteristics and treatment details

N = 309%
Median age (year, range)51 (22-82)
>65 years-old patients3912.6
De-novo metastatic patients25883.5
Histopathology
IDC29093.9
ILC31
Mixt51.6
Others113.5
Hormone receptor status
ER and/or PR positive17055.2
ER/PR negative13844.8
Unknown10.3
Metastatic site distribution
Liver ± LN/skeletal11236.3
Lung ± LN/skeletal12038.8
Brain only61.9
Brain + liver + lung72.3
Liver + lung165.2
Other4815.5
Only skeletal or only LN--
Prior therapies
Prior anthracyclines5116.5
Prior trastuzumabNANA
Treatment details
Median number of cycle (range)
Pertuzumab-trastuzumab10 (1-75)
Docetaxel6 (1-23)
Paclitaxel3 (1- 26)

IDC: Invasive Ductal Carcinoma ILC: Invasive lobular carcinoma LN: Lymph Node

Conclusions

This real-life practice population differs from the CLEOPATRA study in terms of visceral only metastatic disease, and inclusion of brain metastatic patients. Regardless of these negative prognostic characteristics, results are concordant with the pivotal study. Elderly patients had overall lower PFS, which necessitates further investigation of pertuzumab-trastuzumab combination with cytotoxic/antihormonal therapies. To our knowledge, this is the largest scale real-life clinical practice study of PTT to date.

Legal entity responsible for the study

Ece ESIN, on behalf of Turkish Oncology Group.

Funding

Has not received any funding.

Disclosure

All authors have declared no conflicts of interest.

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