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Expert Interview

Slingshot members are talking to an expert! The topic is:

Examining the Phase 3 POD1UM-303 Trial Results for Retifanlimab (Zynyz®) in Advanced Squamous Cell Carcinoma of the Anal Canal

Ticker(s): INCY

Who's the expert?

A medical oncologist with expertise in immuno-oncology and rare gastrointestinal cancers, particularly anal squamous cell carcinoma. The ideal expert should have been involved in SCAC trials or guideline development and possess a nuanced understanding of checkpoint inhibitor combinations in solid tumors, with familiarity in interpreting immune-related adverse events and therapeutic durability.

Interview Questions
Q1.

The POD1UM-303 trial demonstrated a median PFS of 9.3 months for retifanlimab plus chemotherapy versus 7.4 months for chemotherapy alone. In a disease with few first-line options, how significant is this improvement in clinical practice, especially considering historical benchmarks for SCAC?

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Q2.

Although the OS benefit at interim analysis—29.2 vs. 23.0 months—did not reach statistical significance, the six-month difference is clinically notable. How should oncologists interpret this finding in light of ongoing survival follow-up, and what thresholds might the final analysis need to cross to confirm benefit?

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Q3.

he study showed consistent PFS benefits across predefined subgroups. Given the heterogeneity in SCAC patient profiles—especially with HIV co-infection—how important is this finding for building clinician confidence in widespread use?

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Q4.

Median duration of response nearly doubled from 7.2 to 14 months with the addition of retifanlimab. What might this suggest about the synergy between PD-1 blockade and platinum-doublet chemotherapy in driving sustained tumor control?

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Q5.

Grade ≥3 adverse events were more frequent with retifanlimab, particularly neutropenia and anemia. From a safety management perspective, are these trade-offs justifiable in frontline therapy, and how does the tolerability compare with PD-1 regimens in other tumor types?

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Q6.

Zynyz received FDA approval both as part of a combination and as a monotherapy for post-platinum settings. How might this dual approval influence treatment sequencing and accessibility for SCAC patients, especially in resource-constrained oncology practices?

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Q7.

Considering that up to 90% of SCAC is HPV-driven and HIV increases risk dramatically, how well does the POD1UM-303 population reflect real-world epidemiology, and were immune-related outcomes influenced by patient immunocompetence?

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Q8.

Given these results and the momentum around checkpoint inhibitors in rare GI cancers, what do you foresee as the role of retifanlimab or similar agents in other HPV-associated lower GI malignancies—or even in broader HPV-positive tumor programs?

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