Clinical trial NCT05754788: Gene Expression Profile of Resected Pancreatic and Ampullary Adenocarcinoma at Favorable Prognosis
Official title: Identification of Gene Expression Profile Associated With Favorable Prognosis in Patients Undergoing Radical Surgery for Pancreatic and Ampullary Adenocarcinoma
Study type: OBSERVATIONAL
Overall status: UNKNOWN
Conditions: Resectable Pancreatic Adenocarcinoma
Keywords: resectable pancreatic adenocarcinoma
gene expression profile
RNA sequencing
prognosis of pancreatic cancer
Lead sponsor: Fondazione IRCCS Istituto Nazionale dei Tumori, Milano
Sponsor class: OTHER
First posted: 2023-03-06
Enrollment: 40
Sex: ALL
Minimum age (years): 18
Maximum age (years): 80
Standard ages: ADULT
OLDER_ADULT
Observational model: CASE_CONTROL
Time perspective: RETROSPECTIVE
Sampling method: NON_PROBABILITY_SAMPLE
Study population: A prospectively maintained database of patients with pancreatic and ampullary adenocarcinoma undergoing radical surgical resection from 1st Jan 2000 to 31st Dec 2017 in a single institution (HPB and liver transplantation Unit, National Institute of Cancer, Milan, Italy) will be used to identify patients at favorable and unfavorable prognosis.

Brief summary: The study aims at evaluating spatially resolved gene expression profiles of pancreatic and ampullary adenocarcinoma at favorable prognosis after surgical resection, in order to identify molecular features associated to a less aggressive biologic behavior that may benefit from upfront surgery.

Detailed description: Despite technical improvements, surgery for pancreatic adenocarcinoma is still burdened by poor survival outcomes of only 10% at 5 years, due to very high locoregional and distant recurrence rates. In order to improve such disappointing results, several studies are now focusing on the role of neoadjuvant treatment. Recent evidence shows that neoadjuvant treatment may achieve improved intention-to-treat survival outcome, increased rates of margin-negative resections and decreased incidence of lymph node metastases. However, all surgical series report that a limited subset of patients achieve long-term survival following radical surgical resection.

After a systematic review of the available evidence on molecular profiling of pancreatic adenocarcinoma published until today the investigators have undertaken a retrospective study aimed at investigating the presence of possible genetic factors associated to a less aggressive clinical behavior. Clinical, biological and pathological features collected in a prospectively maintained database of radical surgery for pancreatic adenocarcinoma will be retrospectively reviewed together with an analysis of molecular features on surgical samples belonging to patients radically operated at the National Institute of Cancer of Milan. Such features may be used to identify those patients who may benefit from upfront surgery; in such group, vascular resections and reconstructions could be considered more liberally.

The study will consist of 2 phases:

1. A preliminary exploratory phase (group A) based on approximately 20 surgical samples of patients with surgically resected pancreatic adenocarcinoma, not treated by neoadjuvant chemotherapy, in order to evaluate the intrinsic role of tumor biology and avoid the selection of molecular features associated to treatment response. This cohort will consist of 2 groups of 10 patients each with prognostically favorable (RFS≥60 months) and unfavorable tumors (RFS\<12 months), respectively. Patients from the 2 groups will be matched for clinicopathological tumor-related features. Spatially resolved transcriptomic analysis will be performed by the GeoMx Digital Spatial Profiler (DSP) (NanoString Technologies, Seattle, WA, USA) on samples of the two groups and the resulting gene expression profiles will be compared, in order to identify different patterns of gene expression in prognostically different pancreatic adenocarcinomas. Such patterns will also be compared with the TCGA database.
2. A subsequent expanded phase, based on the results of the previous exploration, will take place in case a different gene expression profile is identified. The internal validation set (group B) consists in additional 20 surgical samples associated to favorable and unfavorable prognosis (10 patients each), respectively, belonging to the same institutional series and matched for clinicopathological tumor-related features. RNA-seq analysis will be carried out on these surgical samples, aiming at confirming the results of the exploratory analysis and refine the gene expression profile. In this subset, the enrolment of patients who underwent neoadjuvant treatment will be allowed.

Due to the limited number, samples from patients affected by ampullary adenocarcinoma with favorable prognosis will be analyzed in one step and compared to matched cases with unfavorable prognosis (8 patients each, group C).

Following the identification of gene expression profiles both for pancreatic and ampullary adenocarcinoma, an external validation set will be enrolled in order to perform RNA-seq analysis on additional 60-80 surgical samples from other institutions and validate the prognostic relevance of the identified pattern in predicting a less aggressive disease course.

Eligibility criteria: Inclusion Criteria:

• Patients \>18 years old undergoing surgical treatment with curative intent for pancreatic and ampullary adenocarcinoma between 1/1/2010 and 31/12/2017 with a regular follow-up and a RFS ≥36 months including:

* Patients with locoregional lymph node metastases found at final pathology;
* Patients with residual microscopic disease found at final pathology (R1 resections);
* Presence of minimal extra-regional disease not detected pre-operatively (nodule of carcinosis, single liver metastasis, single extra-regional lymph node) and removed with the primary tumor within the same intervention.

Exclusion Criteria:

* Patients undergoing preoperative radiotherapy/chemotherapy for borderline resectable or initially unresectable tumors converted to surgical resection;
* Patients with residual macroscopic disease after surgery (R1 resections);
* Patients with metastatic disease found at laparotomy and contraindicating surgical resection, including unknown liver metastases, peritoneal carcinomatosis, distant lymph node disease;
* Patients with unavailable follow-up or surgical samples for gene analysis.

Primary outcomes:
measure: Favorable-prognosis gene expression pattern
timeFrame: 19/09/2022-29/09/2023
Secondary outcomes:
measure: TCGA comparison
timeFrame: 19/09/2022-29/09/2023
measure: Clinical, biological and pathological factors
timeFrame: 19/09/2022-29/09/2023
measure: External validation of gene expression profile
timeFrame: 19/09/2022-29/09/2023
Other outcomes:
Locations:
city: Milan
country: Italy
facility: National Cancer Institute of Milan
Study officials:
References:
citation: Torres C, Grippo PJ. Pancreatic cancer subtypes: a roadmap for precision medicine. Ann Med. 2018 Jun;50(4):277-287. doi: 10.1080/07853890.2018.1453168. Epub 2018 Mar 22.
citation: Pihlak R, Weaver JMJ, Valle JW, McNamara MG. Advances in Molecular Profiling and Categorisation of Pancreatic Adenocarcinoma and the Implications for Therapy. Cancers (Basel). 2018 Jan 12;10(1):17. doi: 10.3390/cancers10010017.
citation: Silvestris N, Brunetti O, Bittoni A, Cataldo I, Corsi D, Crippa S, D'Onofrio M, Fiore M, Giommoni E, Milella M, Pezzilli R, Vasile E, Reni M. Clinical Practice Guidelines for Diagnosis, Treatment and Follow-Up of Exocrine Pancreatic Ductal Adenocarcinoma: Evidence Evaluation and Recommendations by the Italian Association of Medical Oncology (AIOM). Cancers (Basel). 2020 Jun 24;12(6):1681. doi: 10.3390/cancers12061681.