- 4.7.1 First Priority: availability of a minimum of a 1 X 10 mm core fresh frozen tumor, or ≥3 mm diameter spherical pellet from a pleural effusion (≥50% tumor cells), or ≥3 mm diameter spherical pellet from a fine needle aspirate (≥50% tumor cells) from clinically indicated interventional procedures, with no systemic anti-cancer therapy or radiation to all sites of evaluable disease between collection of the biopsy and entry into the study (e.g. if a brain metastasis was radiated but the lung tumor was not, then the latter could still be biopsied and the subject enrolled after radiation therapy of the brain metastasis (and vice versa)).