A Study to Evaluate the Efficacy and Safety of CNTO328 Plus Best Supportive Care in Multicentric Castleman's Disease

Durable tumor and symptomatic response is complete response (CR) + partial response (PR). CR: complete disappearance of all measurable and evaluable disease (eg, pleural effusion) and resolution of baseline symptoms attributed to multicentric Castleman's disease, sustained for at least 18 weeks. PR: >=50 percent decrease in sum of the product of the diameters of indicator lesion(s), with at least stable disease in all other evaluable disease in the absence of treatment failure sustained for at least 18 weeks. The statistical analysis shows difference in symptomatic response rate (siltuximab+best supportive care [BSC] minus Placebo+BSC).

Duration of tumor and symptomatic response is defined as time from first documentation of tumor and symptomatic response (CR or PR) to treatment failure. Whenever possible, treatment failure documented by the appearance of new lesions should be confirmed by histologic examination of the new lesions. Symptomatic response is complete response (CR) + partial response (PR). CR: complete disappearance of all measurable and evaluable disease (eg, pleural effusion) and resolution of baseline symptoms attributed to multicentric Castleman's disease, sustained for at least 18 weeks. PR: >=50 percent decrease in sum of the product of the diameters of indicator lesion(s), with at least stable disease in all other evaluable disease in the absence of treatment failure sustained for at least 18 weeks.

Overall tumor response is CR + PR assessed according to Cheson criteria. CR: complete disappearance of all measurable and evaluable disease (eg, pleural effusion). PR: a >=50 percent decrease in sum of the product of the diameters of index lesion(s), with at least stable disease in all other evaluable disease. Statistical analysis shows difference of overall response rates (siltuximab+best supportive care [BSC] minus Placebo+BSC).

Duration of tumor response is defined as time from first documentation of tumor response to tumor progression. Tumour response is complete response (CR) + partial response (PR) as assessed according to Cheson criteria. CR: complete disappearance of all measurable and evaluable disease (eg, pleural effusion). PR: a >=50 percent decrease in sum of the product of the diameters of index lesion(s), with at least stable disease in all other evaluable disease. Statistical analysis shows difference of overall response rates (siltuximab+best supportive care [BSC] minus Placebo+BSC).

Time to treatment failure was defined as the time from randomization until the participant fails treatment. Treatment failure was defined as any of the following: a sustained increase from baseline in disease related symptoms >=Grade 2 persisting for at least 3 weeks despite best supportive care (BSC); onset of any new disease related Grade 3 or higher symptom despite BSC; sustained (ie, at least 3 weeks) deterioration in performance status (increase from baseline in Eastern Cooperative Oncology Group Performance Status by more than 1 point) despite BSC; radiologic progression, as measured by modified Cheson criteria; Initiation of any other therapy intended to treat multicentric Castleman's disease ie, prohibited treatments. Statistical analysis shows difference in treatment failure rate (siltuximab+BSC minus Placebo+BSC).

Hemoglobin response rate is defined as percentage of participants who achieved >= 15 g/L hemoglobin at Week 13.

Hemoglobin response rate is defined as percentage of participants who achieved >= 20 g/L hemoglobin at Week 13.

Percentage of participants who discontinued corticosteroids during blinded treatment period and who were dependent on corticosteroids at baseline (Day 1 of Cycle 1).

Overall survival was defined as percent chance of survival of participants who were still alive at 6 years from time of first study treatment was analyzed.

A patient-reported symptom scale. Symptom presence/absence and severity are noted on an anchor-based numeric scale. Scores range from 1 (very mild) to 5 (very severe).

The FACIT-F, a 13-item instrument, was designed to measure patient-reported fatigue. It is one of the suite of FACIT instruments developed for outcomes in cancer. Concepts measured in the scale include tiredness, weakness, and difficulty conducting usual functional activities or social interaction due to fatigue. Response options range from "not at all" (0) to "very much" (4), and yield a summary score. Total FACIT-F score is the sum of 13 items, ranging from 0 (not at all) to 52 (very much). Higher scores represent better outcomes.

SF-36 is a questionnaire and PCS is a part of subscale assessing physical functioning, role-physical, bodily pain, and general health. The scores range from 0 (worst score) to 100 (best score), with a higher score indicating better quality of life.