A castrate-resistant metastatic prostate cancer patient with severe pancytopenia, successfully treated with docetaxel chemotherapy

Introduction Prognosis of metastatic castrate-resistant prostate cancer is poor with a median survival of 12 to 36 months. Bone metastasis is common, and bone marrow metastasis occurs later in the disease course. The median survival in these patients after bone marrow involvement is less than six months. We report a case of castrate-resistant prostate cancer patient presented with severe pancytopenia due to bone marrow involvement of prostate cancer, treated successfully with docetaxel chemotherapy. Post chemotherapy, the patient became transfusion independent and prostate-specific antigen improved to 0.1 ng/ml from 1051 ng/ml. Case report A 70-year-old gentleman with a history of metastatic prostate cancer on androgen deprivation therapy and polycythemia vera presented to emergency room with dizziness and melena. Workup revealed severe pancytopenia with platelet count of 12k and hemoglobin of 4.5 gm/dl. Bone marrow biopsy confirmed diffuse involvement of bone marrow with prostate cancer. Prostate-specific antigen was 1051 gm/dl. Management and outcome: The patient received 14 units of packed red blood cell, 10 units of platelet transfusion within one week. Docetaxel chemotherapy was started along with thrombopoietin agonist romiplostim and pegylated filgrastim. He received five cycles of docetaxel treatment. Post chemotherapy, the patient became transfusion independent and prostate-specific antigen improved to 1.17 ng/ml from 1051 ng/ml. The patient is still alive one year after the presentation with good quality of life and the prostate-specific antigen further improved to 0.1 ng/dl. Conclusion This case suggests that selected patients with severe pancytopenia, due to bone marrow infiltration of prostate cancer, can be treated with docetaxel chemotherapy and romiplostim support with significant response. Docetaxel treatment may be beneficial to unpack the marrow and for quicker response in patients with good performance status.