Semiquantitative PCR analysis G1MD (A) and G1Na (B) marking in granulocytes at hematopoietic recovery and during MDR chemotherapy. Semiquantitative PCR analysis for G1MD and G1Na was performed on DNA from granulocytes obtained at hematopoietic reconstitution and during each cycle of chemotherapy. The maximal level of marking for each vector at hematopoietic recovery and at any time during chemotherapy is depicted for each patient. The patient samples are referred to by patient number.