Change in average pain from Week 1 to Week 5, measured on day 1 of Weeks 1 and 6 by the Brief Pain Inventory Short Form (BPI-SF) was calculated as value at Day 1 of Week 1 minus value at Day 1 of Week 6 to yield positive improvement values. The BPI-SF contains 4 items assessing average, worst, least, and intermediate pain severity in the last 24 hours. Pain severity items are scored using an 11-point numeric rating scale (0, no pain; 10, pain as bad as you can imagine). Average pain severity was chosen as the primary outcome based on recommendations from the Initiative on Methods, Measurements, and Pain Assessment in Clinical Trials (IMMPACT). Patients completed the BPI-SF when thinking only about pain from peripheral neuropathy. The Cronbach's alpha reliability for the BPI ranges between 0.77 and 0.91. The comparison of interest was the difference between the 2 treatment groups in pain change during the initial treatment period.

Patients who completed initial intervention (prior to crossing over to receive alternate study drug duloxetine or placebo) and had complete data were included in the primary analysis.

Change in pain-related functional interference score during the initial treatment period (Week 1 to Week 5), as measured by the BPI-SF interference score: Using an accepted method for accessing the influence of pain on function, 7 BPI-SF items were used to quantify the degree to which pain interfered with daily activities or function (0, does not interfere; 10 completely interferes). The 7 items were summed to obtain a total interference score, which ranged from 0 to 70, with lower scores meaning less interference. The mean change in pain-related functional interference score during the initial treatment period are reported below for each treatment arm and was calculated as value at Day 1 of Week 1 minus value at Day 1 of Week 6 to yield positive improvement values.

Patients who completed initial intervention (prior to crossing over to receive alternate study drug duloxetine or placebo) and had complete data were included in the primary analysis.

Patient-reported QOL was assessed using the Functional Assessment of Cancer Treatment, Gynecologic Oncology Group Neurotoxicity (FACT/GOG-Ntx) subscale on day 1 of weeks 1, 6, 8, and 13. The instrument contains 11 questions, assessing numbness, tingling, and discomfort in the hands or feet; difficulty hearing; tinnitus; joint pain or muscle cramps; weakness; or trouble walking, buttoning buttons, or feeling small shapes when placed in the hand. Items are scored from 0 to 4 (o, not at all; 4, very much) and summed (total score range, 0-44, with higher scores indicating a worse outcome). A 2- to 3-point change is defined as a clinically meaningful improvement in QOL per published recommendations specific to similar measures. The Mean Change During Initial Treatment Period in the FACT/GOG-Ntx total score are reported for each treatment arm and was calculated as value at Day 1 of Week 1 minus value at Day 1 of Week 6 to yield positive improvement values.

Patients who completed initial intervention (prior to crossing over to receive alternate study drug duloxetine or placebo) and had complete data were included in the primary analysis.

Change in average pain from Week 8 to Week 12, measured on day 1 of Weeks 8 and 13 by the Brief Pain Inventory Short Form (BPI-SF) was calculated as value at Day 1 of Week 8 minus value at Day 1 of Week 13 to yield positive improvement values. The BPI-SF contains 4 items assessing average, worst, least, and intermediate pain severity in the last 24 hours. Pain severity items are scored using an 11-point numeric rating scale (0, no pain; 10, pain as bad as you can imagine). Average pain severity was chosen as the primary outcome based on recommendations from the Initiative on Methods, Measurements, and Pain Assessment in Clinical Trials (IMMPACT). Patients completed the BPI-SF when thinking only about pain from peripheral neuropathy. The Cronbach's alpha reliability for the BPI ranges between 0.77 and 0.91. The comparison of interest was the difference between the 2 treatment groups in pain change during the crossover treatment period.

Patients who completed crossover intervention and had complete data were included in the analysis.