1025 - Liver metastases (LM) from intrahepatic cholangiocarcinoma (iCCA): Outcomes from the European Network for the Study of Cholangiocarcinoma (ENS-CCA) registry and implications on current American Joint Committee on Cancer (AJCC) staging.

Background

The AJCC classifies LM of iCCA as early stage: T2b [stage II/IVa (AJCCv.7) and stage II/III (AJCCv.8) if N0/N1, respectively]; in contrast, LM are perceived by clinicians to be of poorer prognosis than other early stages.

Methods

Eligible patients (pts): iCCA from the ENS-CCA registry with survival / staging (AJCCv.7) data. Patients were classified: Group (g) A: stages I-III (excluding T2bN0); gB: stage IVa (excluding T2bN1M0); gC: LM (T2bN0/1); gD: stage IVb (M1 extra-hepatic disease). Primary end-point: overall survival (OS) (time from first diagnosis to death/last visit). Survival analysis was performed in a training set (TS) and findings validated in a validation set (VS); Kaplan Meier and Cox Regression. Sensitivity analysis (SA) was performed limiting gC to N0.

Results

Of 1,820 pts (810 iCCA), 574 were eligible (141 TS; 433 VS). Following the new classification, 114 stage I-IVa pts (28.9%) were re-classified into the gC (75 N0; 39 N1): gA (192 pts; 33.5%), gB (89; 15.5), gC (114;19.8), gD (179; 31.2). In the TS, multivariate Cox Regression was adjusted for obesity (p 0.026) and performance status (p < 0.001); pts in gA (HR 0.39 (95%CI 0.18-0.85); p 0.017) had a lower risk of death (vs gC); gB and gD showed a trend towards better and shorter survival (vs gC), respectively, but differences did not reach statistical significance (p 0.109 and 0.737, respectively). Findings were validated in the VS: gA (vs gC) HR 0.34 (95%CI 0.24-0.49); p < 0.001. SA (whole series) confirmed independence from N1 status [gA (vs gC) HR 0.39 (95%CI 0.28-0.57); p < 0.001)]. Table shows outcome data for all stages (whole series).Table:

731P

Conclusions

LM from iCCA have a worse outcome than other early stages (I-III). Unfortunately, the latest version of AJCC (AJCC v.8) does not take this into consideration; further changes in the AJCC classification are warranted.

Clinical trial identification

Editorial acknowledgement

Legal entity responsible for the study

European Network for the Study of Cholangiocarcinoma (ENS-CCA).

Funding

ENS-CCA received funding from EASL Registry Award 2016 and Support from the Spanish Association of Gastroenterology (AEG), for the development of this registry; Dr Angela Lamarca received funding from Conquer Cancer Foundation of the American Society of Clinical Oncology (YIA 2017) and The Christie Charity.

Disclosure

A. Lamarca: Speaker Bureau / Expert testimony: Merck; Speaker Bureau / Expert testimony, Research grant / Funding (self), Travel / Accommodation / Expenses: Ipsen; Speaker Bureau / Expert testimony, Travel / Accommodation / Expenses: Pfizer; Travel / Accommodation / Expenses: Novartis; Travel / Accommodation / Expenses: Abott Nutrition; Travel / Accommodation / Expenses: Celgene; Travel / Accommodation / Expenses: AAA; Travel / Accommodation / Expenses: Sirtex Medical; Travel / Accommodation / Expenses: Bayer; Travel / Accommodation / Expenses: Delcath; Travel / Accommodation / Expenses: Mylan; Advisory / Consultancy: Eisai; Advisory / Consultancy: Nutricia. A. La Casta: Travel / Accommodation / Expenses: Celgene; Travel / Accommodation / Expenses: Ipsen; Travel / Accommodation / Expenses: Roche. A. Forner: Advisory / Consultancy: Guerbet; Speaker Bureau / Expert testimony, Travel / Accommodation / Expenses: Bayer; Speaker Bureau / Expert testimony: BTG. V. Cardinale: Licensing / Royalties: VESTA Therapeutics. D. Alvaro: Research grant / Funding (self), Licensing / Royalties: VESTA Therapeutics; Research grant / Funding (self): Intercept Pharmaceuticals. J.W. Valle: Honoraria (self), Advisory / Consultancy, Speaker Bureau / Expert testimony: Ipsen; Advisory / Consultancy, Speaker Bureau / Expert testimony, Research grant / Funding (institution): Novartis; Advisory / Consultancy: AstraZeneca; Advisory / Consultancy: Merck; Advisory / Consultancy: Delcath Systems; Advisory / Consultancy: Agios; Advisory / Consultancy: Pfizer; Advisory / Consultancy: PCI Biotech; Advisory / Consultancy: Incyte; Advisory / Consultancy: Keocyt; Advisory / Consultancy: QED Therapeutics; Advisory / Consultancy: Pieris Pharmaceuticals; Advisory / Consultancy: Genoscience Pharma; Advisory / Consultancy: Mundipharma EDO GmbH; Speaker Bureau / Expert testimony, Travel / Accommodation / Expenses: Nucana; Speaker Bureau / Expert testimony: Imaging Equipment Limited; Travel / Accommodation / Expenses: Celgene. All other authors have declared no conflicts of interest.