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Background
CRC-PIPAC prospectively assessed repetitive oxaliplatin-based pressurized intraperitoneal aerosol chemotherapy (PIPAC-OX) as a palliative monotherapy (i.e., without concomitant systemic therapy in between subsequent procedures) for unresectable colorectal peritoneal metastases (CPM). The present study explored patient-reported outcomes (PROs) during trial treatment.
Methods
In this single-arm phase 2 trial in two tertiary centers, patients with isolated unresectable CPM received 6-weekly PIPAC-OX (92 mg/m
2
). PROs (calculated from EQ-5D-5L, and EORTC QLQ-C30 and QLQ-CR29) were compared between baseline and 1 and 4 weeks after the first three procedures using linear mixed modeling with determination of clinical relevance (Cohen’s
D
≥ 0.50) of statistically significant differences.
Results
Twenty patients underwent 59 procedures (median 3 [range 1–6]). Several PROs solely worsened 1 week after the first procedure (index value − 0.10,
p
< 0.001; physical functioning − 20,
p
< 0.001; role functioning − 27,
p
< 0.001; social functioning − 18,
p
< 0.001; C30 summary score − 16,
p
< 0.001; appetite loss + 15,
p
= 0.007; diarrhea + 15,
p
= 0.002; urinary frequency + 13,
p
= 0.004; flatulence + 13,
p
= 0.001). These PROs returned to baseline at subsequent time points. Other PROs worsened 1 week after the first procedure (fatigue + 23,
p
< 0.001; pain + 29,
p
< 0.001; abdominal pain + 32,
p
< 0.001), second procedure (fatigue + 20,
p
< 0.001; pain + 21,
p
< 0.001; abdominal pain + 20,
p
= 0.002), and third procedure (pain + 22,
p
< 0.001; abdominal pain + 22,
p
= 0.002). Except for appetite loss, all changes were clinically relevant. All analyzed PROs returned to baseline 4 weeks after the third procedure.
Conclusions
Patients receiving repetitive PIPAC-OX monotherapy for unresectable CPM had clinically relevant but reversible worsening of several PROs, mainly 1 week after the first procedure.
Trial registration
Clinicaltrials.gov: NCT03246321; Netherlands trial register: NL6426.