Tumor regression and temporary restoration of immune response after plasmapheresis in a patient with recurrent oral cancer.

: A major response to plasmapheresis is reported in a patient with advanced, recurrent squamous cell cancer of the oral cavity, similar to that previously reported in three of six comparable patients. Tumor regression followed temporary reduction of inhibition of normal lymphocyte response to phytohemagglutinin (PHA) by the patient's serum (from 99% to zero) and partial restoration of the patient's lymphocyte response (from 2% to 38% of control). The IgE level rose both overall and during some exchanges; this correlate of tumor response had been noted earlier. The tumor showed extensive necrosis, but the clinical effects were relatively short-lived and the patient died 11 weeks later. Biopsy specimens taken early in apheresis showed intense new infiltration of tumor by lymphocytes and monocytes; later biopsy specimens showed predominantly plasma cells with trapping and lysis of tumor cells. No other anti-cancer therapies had been used for 16 months before this trial, and no replacements were given other than saline and albumin.