Switch to fulvestrant and palbociclib versus no switch in advanced breast cancer with rising ESR1 mutation during aromatase inhibitor and palbociclib therapy (PADA-1): a randomised, open-label, multicentre, phase 3 trial

BACKGROUND

In advanced oestrogen receptor-positive, HER2-negative breast cancer, acquired resistance to aromatase inhibitors frequently stems from ESR1-mutated subclones, which might be sensitive to fulvestrant. The PADA-1 trial aimed to show the efficacy of an early change in therapy on the basis of a rising ESR1 mutation in blood (bESR1^mut), while assessing the global safety of combination fulvestrant and palbociclib.

METHODS

We did a randomised, open-label, phase 3 trial in 83 hospitals in France. Women aged at least 18 years with oestrogen receptor-positive, HER2-negative advanced breast cancer and an Eastern Cooperative Oncology Group performance status of 0-2 were recruited and monitored for rising bESR1^mut during first-line aromatase inhibitor (2·5 mg letrozole, 1 mg anastrozole, or 25 mg exemestane, orally once per day, taken continuously) and palbociclib (125 mg orally once per day on days 1-21 of a 28-day cycle) therapy. Patients with newly present or increased bESR1^mut in circulating tumour DNA and no synchronous disease progression were randomly assigned (1:1) to continue with the same therapy or to switch to fulvestrant (500 mg intramuscularly on day 1 of each 28-day cycle and on day 15 of cycle 1) and palbociclib (dosing unchanged). The randomisation sequence was generated within an interactive web response system using a minimisation method (with an 80% random factor); patients were stratified according to visceral involvement (present or absent) and the time from inclusion to bESR1^mut detection (<12 months or ≥12 months). The co-primary endpoints were investigator-assessed progression-free survival from random assignment, analysed in the intention-to-treat population (ie, all randomly assigned patients), and grade 3 or worse haematological adverse events in all patients. The trial is registered with Clinicaltrials.gov (NCT03079011), and is now complete.

FINDINGS

From March 22, 2017, to Jan 31, 2019, 1017 patients were included, of whom 279 (27%) developed a rising bESR1^mut and 172 (17%) were randomly assigned to treatment: 88 to switching to fulvestrant and palbociclib and 84 patients to continuing aromatase inhibitor and palbociclib. At database lock on July 31, 2021, randomly assigned patients had a median follow-up of 35·3 months (IQR 29·2-41·4) from inclusion and 26·0 months (13·8-34·3) from random assignment. Median progression-free survival from random assignment was 11·9 months (95% CI 9·1-13·6) in the fulvestrant and palbociclib group versus 5·7 months (3·9-7·5) in the aromatase inhibitor and palbociclib group (stratified HR 0·61, 0·43-0·86; p=0·0040). The most frequent grade 3 or worse haematological adverse events were neutropenia (715 [70·3%] of 1017 patients), lymphopenia (66 [6·5%]), and thrombocytopenia (20 [2·0%]). The most common grade 3 or worse adverse events in step 2 were neutropenia (35 [41·7%] of 84 patients in the aromatase inhibitor and palbociclib group vs 39 [44·3%] of 88 patients in the fulvestrant and palbociclib group) and lymphopenia (three [3·6%] vs four [4·5%]). 31 (3·1%) patients had grade 3 or worse serious adverse events related to treatment in the overall population. Three (1·7%) of 172 patients randomly assigned had one serious adverse event in step 2: one (1·2%) grade 4 neutropenia and one (1·2%) grade 3 fatigue among 84 patients in the aromatase inhibitor and palbociclib group, and one (1·1%) grade 4 neutropenia among 88 patients in the fulvestrant and palbociclib group. One death by pulmonary embolism in step 1 was declared as being treatment related.

INTERPRETATION

PADA-1 is the first prospective randomised trial showing that the early therapeutic targeting of bESR1^mut results in significant clinical benefit. Additionally, the original design explored in PADA-1 might help with tackling acquired resistance with new drugs in future trials.

FUNDING

Pfizer.

Unexpected severe hepatic and skin toxicities during high dose methotrexate course for osteosarcoma

INTRODUCTION

high dose methotrexate (HD-MTX) regimen is used in osteosarcoma, leukemia and lymphoma treatment. Osteosarcoma is mostly diagnosed in children and adolescents. Most frequent methotrexate toxicities are mucositis, myelosuppression, renal failure, hepatitis and necrotizing encephalopathy. Toxicities increase with renal impairment, denutrition, in older patients, with some pharmacogenetics factors or with drug interactions.

CASE REPORT

We report a 16th years old woman diagnosed with osteosarcoma and experienced an unexpected severe hepatic and skin toxicities as toxic epidermal necrolys, Steven Johnson syndrome.

MANAGEMENT AND OUTCOME

This toxicity occurred despite acid folinic rescue performed as good practice recommendation. Fourteen hours after methotrexate administration, renal failure was observed and after 72 h an erythematous rash and epidermal detachment with toxic epidermal necrolys. Seven days after methotrexate administration, hepatic failure began until grade IV cytolysis. High dose of folinic acid were administered during all severe toxicities. Methotrexate were not longer administered to this young patient and chemotherapy with ifosfamide (IFO), doxorubicine and cisplatin were performed in this patient and complete histologic response were observed in the surgical bone resection.

DISCUSSION

No classical toxicities risk factors were identified in this patient but a homozygote mutation of MTHFR gene and homozygote SLCO1B1 gene mutation were found. MTHFR and SLCO1B1 are both implicated in methotrexate metabolism.

Cross-Cultural Adaptation and Psychometric Validation of the French Version of the FAMCARE-Patient (FFP-16) Questionnaire for Outpatients With Advanced-Stage Cancer

CONTEXT

Satisfaction is known to be correlated with the quality of care; it indicates the adequacy of the caregivers' responses in meeting the needs and expectations of patients. The FAMCARE-Patient questionnaire has been used to quantify satisfaction level in outpatients with advanced-stage cancers.

OBJECTIVES

To translate and cross-culturally adapt the FAMCARE-Patient questionnaire for French patients and to evaluate the psychometric properties of this version.

METHODS

The original questionnaire was translated into French and adapted to French cultural context by an expert committee. The French FAMCARE-Patient Version 16 (FFP-16) was then pilot tested among 51 patients. Subsequently, psychometric properties were evaluated in a cross-sectional study by administrating the new tool to 176 adult outpatients with advanced-stage cancer who underwent oncological care at our university hospital.

RESULTS

We performed a confirmatory factor analysis and assessed the reliability and validity of the questionnaire. The one-factor structure was confirmed, and it had an acceptable fit with a comparative fit index and root mean square error of approximation of 0.93 and 0.07, respectively. Internal reliability was high as shown by Cronbach's alpha (α = 0.95). Reproducibility was very good (intraclass correlation coefficient 0.91). The FFP-16 score was independent of the Eastern Cooperative Oncology Group and the overall Edmonton Symptom Assessment Scale distress scores. It was significantly but weakly correlated with anxiety, well-being, and overall quality of life (Spearman's correlation coefficient = -0.18, -0.20, and 0.30, respectively; P < 0.05).

CONCLUSION

We found the FFP-16 questionnaire to be a reliable and valid instrument for the assessment of satisfaction in French outpatients with advanced-stage cancer.

Abstract P5-11-22: Clinical and biological efficacy of first line AI and palbociclib in ER+ HER2- MBC with detectable circulating ESR1 mutation prior to treatment initiation

Background: In ER+ HER2- metastatic breast cancer (MBC), activating ESR1 mutations (ESR1mut) confer resistance to aromatase inhibitors (AI) when used as single agent. The impact of ESR1mut, when detected at baseline (prior to the initiation of therapy), on the efficacy of first line combined AI- CDK4/6 inhibitor therapy remains however unknown.

Methods: The PADA-1 phase 3 trial (NCT03079011) aims at evaluating the utility of monitoring the onset of ESR1mut in cell-free DNA (cfDNA) from patients (pts) receiving AI-palbociclib, as a biomarker to trigger a switch from AI to fulvestrant. Main inclusion criteria were pts with no prior therapy for MBC and with no overt resistance to AI (i.e. no adjuvant AI or adjuvant AI completed &gt;12 months prior to the metastatic relapse). The present exploratory analysis evaluated the biological and clinical outcome of patients who tested positive for ESR1mut at baseline (before any treatment).

Results: From 04/2017 to 01/2019, N=1017 ER+ HER2- MBC pts were included and had their cfDNA tested for ESR1mut at inclusion and during therapy (at 1 month and then every 2 months). N=33/1017 pts had a detectable circulating ESR1mut at inclusion (3.2%, 95%CI [2.2;4.5]), with a median allelic frequency (AF) of 2.5% (range: 0.1- 46%). First, we evaluated the kinetics of ESR1mut in the 33 ESR1mut-positive pts at inclusion. N=1 pt died after 1 month on treatment. In N=25/32 pts (78%), ESR1mut became undetectable (AF&lt;0.1%) within the first 5 months on treatment, with a median time to ESR1mut ‘clearance’ in cfDNA of 34 days 95%CI[29;91d]. Among these 25 pts, with a median follow-up of 10 months (range 0-25.1m): 14 pts (56%) had ESR1mut detected again in cfDNA during AI-palbociclib therapy; 2 pts (8%) experienced a disease progression with no ESR1mut detected; the remaining 9 patients (36%) are still both ESR1mut -free and disease progression-free at time of analysis. Secondly, we evaluated the prognostic impact of cfDNA ESR1mut status at inclusion on progression-free survival (PFS) under AI palbociclib treatment, with an overall median follow-up time of 12.4 months (range: 0-25.3m). The 33 ESR1mut-positive pts experienced a shorter PFS (median PFS: 17.5mo, 95%CI=[10.5-NR]) than the 984 ESR1mut-negative pts (median PFS not reached), with an estimated HR= 2.8, 95%CI=[1.6;5].

Conclusions: ESR1mut are rarely detected in the cfDNA of ER+ HER2- MBC patients with no overt resistance to AI. The quick ‘clearance’ of ESR1mut observed in most patients following treatment initiation and the observed 17.5 months-long median PFS both suggest that the AI palbociclib combination retain clinical activity in ESR1mut-positive MBC. However, in most patients, these mutations were eventually detected again later during therapy and ESR1mut- positivity was associated with a significantly shorter PFS, suggesting that ESR1mut positivity at baseline could accelerate the onset of resistance to AI-palbociclib.

Funding: Pfizer

Citation Format: François-Clément Bidard, Céline Callens, Florence Dalenc, Barbara Pistilli, Thibault de la Motte Rouge, Florian Clatot, Véronique D'Hondt, Luis Teixeira, Sibille Everhard, Hélène Vegas, Jérôme Lemonnier, Ivan Bieche, Anne Pradines, Jean-François Paitel, Dominique Spaeth, Jean-Luc Canon, Isabelle Moullet, Jean-Yves Pierga, Frédérique Berger, Thomas Bachelot, Suzette Delaloge. Clinical and biological efficacy of first line AI and palbociclib in ER+ HER2- MBC with detectable circulating ESR1 mutation prior to treatment initiation [abstract]. In: Proceedings of the 2019 San Antonio Breast Cancer Symposium; 2019 Dec 10-14; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2020;80(4 Suppl):Abstract nr P5-11-22.

Emergence of community-acquired Clostridium difficile infection: the experience of a French hospital and review of the literature

BACKGROUND

Clostridium difficile infection (CDI) is a common cause of nosocomial diarrhoea. People in the general community are not usually considered to be at risk of CDI. CDI is associated with a high risk of morbidity and mortality. The risk of severity is defined by the Clostridium Severity Index (CSI).

METHODS

The cases of 136 adult patients with CDI treated at the University Hospital of Tours, France between 2008 and 2012 are described. This was a retrospective study.

RESULTS

Among the 136 patients included, 62 were men and 74 were women. Their median age was 64.4 years (range 18-97 years). Twenty-six of the 136 (19%) cases were community-acquired (CA) and 110 (81%) were healthcare-acquired (HCA). The major risk factors for both groups were long-term treatment with proton pump inhibitors (54% of CA, 53% of HCA patients) and antibiotic treatment within the 2.5 months preceding the CDI (50% of CA, 91% of HCA). The CSI was higher in the CA-CDI group (1.56) than in the HCA-CDI group (1.39). Intensive care was required for 8% of CA-CDI and 16.5% of HCA-CDI patients.

CONCLUSIONS

CDI can cause community-acquired diarrhoea, and CA-CDI may be more severe than HCA-CDI. Prospective studies of CDI involving people from the general community without risk factors are required to confirm this observation.

[Cryptococcosis in Venezuela. Comments on a clinical case with unusual location]

A tumor like case of Cryptococcosis with a rare location in the abdomen of a young healthy woman is commented. It gave the opportunity to refer to the pathogeny of the disease, making in that way a brief review of the cases known in Venezuela and some not still published from which we got information. That review showed that generally doctors found more frequently organic lesions within the fields they are specially working for. It is obvious that mycosis must be considered in the diagnosis of nearly every patient in many countries and that laboratories must get appropriate equipment and personnel to help in that diagnosis.

The participation of aortic proteins in the formation of complexes between low density lipoproteins and intima-media extracts

SUMMARY

A factor of protein nature that forms specific complexes with low density lipoproteins (LDL) has been detected in extracts of aortic intima-media from men and rabbits. Although the formation of complexes is maximal at low ionic strength, it is still observed under physiological conditions. Gel electrophoresis of the complex formed between the extracts and LDL proteins indicates that the insoluble material is an aggregate of the lipoproteins with some of the proteins present in the extracts. Pretreatment of the intima-media extract with proteases greatly diminishes its complexing ability. The interaction was also observed between the extracts and sera. The sera from patients with myocardial infarct formed more insoluble complexes than the sera from a control group. The lipoprotein complexing agent was found in intima-media of aorta and coronary arteries but not in that of veins, pulmonary arteries or in the adventitia of arteries or veins.