ATP Binding Cassette Transporter, Subfamily B, Member 1/biosynthesis; Chromosomes, Human, Pair 14/genetics; Chromosomes, Human, Pair 18/genetics; Gene Expression Regulation, Neoplastic; Genes, p53; Lymphoma, Non-Hodgkin/genetics; Neoplasm Proteins/biosynthesis; Translocation, Genetic; ATP Binding Cassette Transporter, Subfamily B, Member 1/genetics; Adult; Aged; Aged, 80 and over; Antineoplastic Combined Chemotherapy Protocols/pharmacology; Antineoplastic Combined Chemotherapy Protocols/therapeutic use; Chromosomes, Human, Pair 14/ultrastructure; Chromosomes, Human, Pair 18/ultrastructure; DNA Mutational Analysis; DNA, Neoplasm/genetics; Disease Progression; Drug Resistance, Multiple; Drug Resistance, Neoplasm; Female; Genes, bcl-2; Humans; Lymphoma, Non-Hodgkin/drug therapy; Lymphoma, Non-Hodgkin/mortality; Male; Middle Aged; Neoplasm Proteins/genetics; Polymerase Chain Reaction; Prognosis; Proto-Oncogene Proteins c-bcl-2/biosynthesis; Treatment Outcome; Tumor Cells, Cultured