Mr3, I believe the lowest dosage was 525 mg. The basket trial regimen was:

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Leronlimab (PRO 140) will be administered subcutaneously as weekly dose of 525 mg until disease progression or intolerable toxicity. Subjects participating in this study will be allowed to receive/continue standard-of-care chemotherapy or radotherapy...

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I don't know if any of the patients described in the Barca poster came from this trial, but here was another study from 2020:

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This is aPhase II Study of Leronlimab (PRO 140) in combination with Regorafenib in Patients with CCR5+, Microsatellite Stable (MSS), Metastatic Colorectal Cancer (mCRC)

Detailed Description

This ia a phase II, single arm study with 30 patients in order to test the hypothesis that the combination of Leronlimab (PRO 140) SC and oral Regorafenib will increase PFS in patients with CCR5 + MSS mCRC.

Leronlimab will be administered subcutaneously at a weekly dose of 700 mg in combination with staring dose of 80 mg Regorafenib at first week of the Cycle 1, followed by escalation of Regorafenib dose to 120 mg and 160 mg in second and third weeks of Cycle 1, respectively. No Regorafenib will be administered during the fourth week.

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