[1] Hosp Nacl Edgardo Rebagliati Martins, Dept Oncol & Radiotherapy, Lima, Peru
[2] Univ San Martin Porres, Ctr Invest Med Precis, Lima, Peru
[3] George Washington Univ, Sch Med & Hlth Sci, GW Canc Ctr, Washington, DC 20052 USA
[4] Dana Farber Canc Inst, Div Hematol Malignancies, Boston, MA 02115 USA