Untreated alcohol use disorder in people who inject drugs: a major barrier to HCV treatment uptake

Aims

Although people who inject drugs (PWID) are the core at-risk population in the hepatitis C (HCV) epidemic in industrialized countries, few initiate treatment. Alcohol use disorder (AUD), common within this population, has been identified as a barrier to HCV treatment uptake in the general population. We investigated whether the arrival of new and well-tolerated HCV treatments (direct-acting antivirals: DAA) has improved HCV treatment uptake in French PWID compared with former treatments (pegylated interferon-based treatments: Peg-IFN).

Methods

Analyses were based on exhaustive care delivery data collected between 2012 and 2016 (study period) in the French national healthcare reimbursement database. Chronic HCV-infected individuals who received opioid agonist therapy (OAT) at least once during the study period were included. Separate analyses were performed for 2012-2013 (Peg-IFN era, 19,700 patients) and 2014-2016 (DAA era, 22,545 patients). Using discrete-time Cox proportional hazards models, we tested for associations between AUD (i.e. AUD-related long-term illness status, diagnosis coding during hospitalization or AUD pharmacological treatment) and first HCV treatment delivery, after adjusting for gender, age, complementary universal health cover, liver disease severity and type of OAT received.

Results

Incidence rate of HCV treatment uptake per 100 person-years [95% confidence interval] was 6.56 [6.30-6.84] and 5.70 [5.51-5.89], for Peg-IFN-based treatment (2012-2013) and DAA (2014-2016), respectively. After multiple adjustment, people with AUD not receiving related medication had 30% and 14% lower Peg-IFN-based treatment and DAA uptake, respectively, than those without AUD (hazard ratio [95%CI]: 0.70 [0.62-0.80] and 0.86 [0.78-0.94]). No difference was observed between those treated for AUD and those without AUD.

Conclusions

Despite the benefits of DAA, untreated AUD is still a major barrier to HCV treatment access for PWID in France.

Key messages

AUD is still a barrier to HCV treatment for French PWID. DAA availability improved HCV treatment uptake for PWID with AUD.

Abstract P3-01-02: Overview of the pathological results and treatment characteristics in the first 1000 patients randomized in the SERC trial: Axillary dissection versus no axillary dissection in patients with involved sentinel node

Background: Three randomized trials have concluded at non inferiority of omission of complementary axillary lymph node dissection (cALND) for patients with involved sentinel node (SN). However, we can outline strong limitations of these trials to validate this attitude with a high scientific level. We designed the SERC randomized trial to compare outcomes in patients with SN involvement treated with ALND or no further axillary treatment. The aim of this study was to analyze results of the first 1000 patients included.

Patients and Methods: SERC trial is a multicenter non-inferiority phase 3 trial. Multivariate logistic regression analysis was used to identify independent factors associated with adjuvant chemotherapy administration and non-sentinel node (NSN) involvement.

Results : Of the 963 patients included in the analysis set, 478 were randomized to receive cALND and 485 SLNB alone. All patient demographics and tumor characteristics were balanced between the two arms. SN ITC was present in 6.3% patients (57/903), micro metastases in 33.0% (298), macro metastases in 60.7% (548) and 289 (34.2%) were non eligible to Z0011 trial criteria.

Whole breast or chest wall irradiation was delivered in 95.9% (896/934) of patients, adjuvant chemotherapy in 69.5% (644/926), endocrine therapy in 89.6% (673/751) and the proportions were similar in the two arms. The overall rate of positive NSN was 19% (84/442) for patients with cALND. Crude rates of positive NSN according to SN status were 4.5% for ITC (1/22), 9.5% for micro metastases (13/137), 23.9% for macro metastases (61/255) and were respectively 29.36% (64/218), 9.33% (7/75) and 7.94% (10/126) when chemotherapy was administered after cALND, before cALND and for patients without chemotherapy.

Conclusion: The main objective of SERC trial is to demonstrate non inferiority of cALND omission. A strong interaction between timing of cALND and chemotherapy with positive NSN rate was observed.

Citation Format: Houvenaeghel G, Cohen M, Raro P, De Troyer J, Tunon De Lara C, Guimbergues P, Gauthier T, Faure C, Vaini-Cowen V, Lantheaume S, Regis C, Darai E, Ceccato V, D'Halluin G, Del Piano F, Villet R, Jouve E, Beedassy B, Theret P, Gabelle P, Zinzindohoue C, Opinel P, Marsollier-Ferrer C, Dhainaut-Speyer C, Colombo P-E, Di Beo V, Lambaudie E, Tallet A, Boher J-M. Overview of the pathological results and treatment characteristics in the first 1000 patients randomized in the SERC trial: Axillary dissection versus no axillary dissection in patients with involved sentinel node [abstract]. In: Proceedings of the 2017 San Antonio Breast Cancer Symposium; 2017 Dec 5-9; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2018;78(4 Suppl):Abstract nr P3-01-02.