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Subcutaneous amivantamab shows shorter administration time and fewer infusion reactions in advanced solid tumorsCould a simple injection replace hours-long cancer infusions?

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Key Takeaway
Consider subcutaneous amivantamab's shorter administration time and reduced infusion reactions versus historical IV data.

A phase Ib dose-escalation study enrolled 158 patients with advanced solid malignancies to evaluate the pharmacokinetics, safety, and recommended phase II doses (RP2Ds) of subcutaneous amivantamab administration. The study compared subcutaneous administration to historical intravenous data, with primary outcomes focused on determining RP2Ds for every-2-week (Q2W), every-3-week (Q3W), and every-4-week (Q4W) dosing schedules.

Subcutaneous administration demonstrated substantially shorter administration time (≤10 minutes versus 2.3 hours for intravenous beyond cycle 3) and showed lower incidence and severity of infusion-related reactions compared to historical intravenous data. Estimated subcutaneous RP2Ds were identified as 1600 mg (2240 mg for patients ≥80 kg) for Q2W, 2400 mg (3360 mg for ≥80 kg) for Q3W, and 3520 mg (4640 mg for ≥80 kg) for Q4W. Observed efficacy was described as consistent with intravenous amivantamab monotherapy, though specific efficacy metrics were not reported.

The safety profile of subcutaneous amivantamab was largely consistent with intravenous monotherapy, with most common toxicities reflecting on-target EGFR/MET inhibition. The study's key limitations include its phase Ib design, comparison to historical rather than concurrent randomized controls, and lack of reported specific efficacy numbers. These findings suggest subcutaneous administration may offer practical advantages in reducing infusion time and reactions, but efficacy equivalence requires confirmation in randomized trials.

Imagine trading a 2.3-hour hospital infusion for a quick injection that takes less than 10 minutes. That's the potential shift a new study is exploring for people with advanced solid tumors. Researchers tested a new way to give the cancer drug amivantamab—as an injection under the skin (subcutaneously) instead of through a vein (intravenously).

The early-phase trial involved 158 patients. The big wins were about making treatment easier. The injection method dramatically cut the time patients spent receiving the drug. It also led to fewer and less severe infusion-related reactions—the chills, fevers, or breathing problems that can happen with IV drugs. The study also figured out potential dosing schedules for future testing.

Doctors saw that the injection's safety profile and early signs of how well it worked against cancer looked consistent with what they know from the IV version. The most common side effects were related to the drug's expected action on cancer cells. It's crucial to remember this is a phase Ib study, a first step in testing this new delivery method. The comparison to the IV treatment was made against historical data, not by randomly assigning patients to one method or the other in the same trial.

This research points toward a future where cancer treatment could be far less disruptive to daily life. The findings on time and safety are encouraging for patient comfort. However, larger, more direct comparisons are needed to fully understand how the injection stacks up against the standard IV treatment in controlling cancer over the long term.

What this means for you:
A cancer drug injection cuts treatment time to minutes with fewer reactions, but larger studies are needed.

Study Details

Study typePhase1
Sample sizen = 158
EvidenceLevel 4
Follow-up0.5 mo
PublishedApr 2026
View Original Abstract ↓
PURPOSE: Amivantamab is an EGFR-MET bispecific antibody approved as an intravenous formulation for EGFR-mutated advanced non-small cell lung cancer (NSCLC). Intravenous delivery is frequently associated with infusion-related reaction (IRRs), which require adopting slow infusion rates and splitting the first dose over 2 days. The PALOMA study assessed the safety and feasibility of subcutaneous amivantamab administration and identified the formulation and recommended phase II doses (RP2Ds) for multiple dosing schedules. PATIENTS AND METHODS: PALOMA is a phase Ib dose-escalation study in 158 participants with advanced solid malignancies. Primary objectives included pharmacokinetics, safety, and determining RP2Ds for every-2-week (Q2W), every-3-week (Q3W), and every-4-week (Q4W) administration. RESULTS: The safety profile of subcutaneous amivantamab was largely consistent with intravenous monotherapy; most common toxicities reflected on-target EGFR/MET inhibition. Subcutaneous amivantamab resulted in meaningfully shorter administration time (≤ 10 minutes vs. 2.3 hours for intravenous beyond cycle 3) and lower incidence and severity of IRRs versus historical intravenous data, which eliminates the need for split-dose administration. Pharmacokinetic analyses and population pharmacokinetic modeling/simulation were used to estimate subcutaneous amivantamab RP2Ds of 1600 mg (2240 mg, ≥ 80 kg), 2400 mg (3360 mg, ≥ 80 kg), and 3520 mg (4640 mg, ≥ 80 kg) for Q2W, Q3W, and Q4W schedules, respectively. The observed efficacy was consistent with intravenous amivantamab monotherapy. CONCLUSION: Subcutaneous amivantamab administration substantially reduced IRRs, obviating the need for prolonged infusions and 2-day split-dosing at first administration. The identified RP2Ds for subcutaneous amivantamab are implemented in ongoing studies evaluating amivantamab regimens in NSCLC, colorectal cancer, and head and neck squamous cell carcinoma.
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