ORLANDOPatients with primary testicular lymphomas treated with CHOP plus intrathecal methotrexate(Drug information on methotrexate) and scrotal radiotherapy had no testicular or central nervous system (CNS) relapses in pilot study data reported by researchers from M.D. Anderson Cancer Center. Andreas Sarris, MD, recently retired as professor of medicine, presented the data as a poster at the 43rd Annual Meeting of the American Society of Hematology (ASH abstract 1457).
"Even after doxorubicin(Drug information on doxorubicin)-based therapy, non-Hodgkin’s lymphomas involving the testis have a 34% probability of relapsing in the CNS, and a 21% probability of relapsing in the contralateral testis, by 10 years," Dr. Sarris told ONI. "Our question was whether treatment with CHOP, intrathecal methotrexate, and scrotal radiotherapy would prevent testicular and CNS relapses in patients with primary testicular lymphoma."
He reported data on 20 patients with histologically proven lymphoma involving the testis, no prior lymphoma, no prior lymphoma therapy (except for orchiectomy), and no HIV infection.
The combination treatment produced complete responses in 18 of 20 patients (90%). Two patients had primary refractory disease. Dr. Sarris said there were no CNS or testicular relapses. There was one toxic death (5%) from neutropenic sepsis. One patient who achieved a complete response relapsed in the liver, was salvaged with stem cell transplantation, and remained in complete response 49 months later.
The regimen included six cycles of CHOP plus optional G-CSF (Neupogen) and concurrent intrathecal methotrexate followed by 30 cGy of scrotal radiotherapy. For prophylaxis, methotrexate was given at 12 mg/wk for 4 weeks. Patients with overt CNS involvement received methotrexate at 12 mg every 3 to 4 days to clearance, then four more injections.
The patients’ median age was 59 years (range, 19 to 82). All had diffuse large B-cell lymphoma. Ann Arbor stage was I in 12 patients, II in 3 patients, III in 1 patient, and IV in 4 patients. Only one patient had B symptoms. Serum beta-2-microglobulin exceeded 3 mg/L in 22% of patients, and 30% of patients had International Prognostic Index (IPI) scores of 2 or greater.
With a median follow up of 32 months, Dr. Sarris reported 3-year progression-free survival of 85% and overall survival of 71%. The 3-year progression-free survival was 90% for patients with IPI of 0 or 1 vs 67% for those with IPI of 2 or greater, but this difference was not statistically significant.