GSTP1 and neutropenia: Furthermore, another study found that GSTP1 c.313A > G was not linked to neutropenia in patients receiving chemotherapy with cyclophosphamide (CP), methotrexate (MTX), and 5-fluorouracil (5-FU) (CMF treatment) or a combination of 5-FU, anthracycline-based chemotherapy (adriamycin or its analog epirubicin), and CP (FAC/FEC treatment) regimens [42].