Institutional learning curve of cytoreductive surgery and hyperthermic intraperitoneal chemoperfusion for peritoneal malignancies.
BACKGROUND
Cytoreductive surgery (CRS) with hyperthermic intraperitoneal chemoperfusion (HIPEC) is routinely used to treat certain peritoneal carcinomatoses (PC), but it can be associated with relatively high complication rates, prolonged hospital length of stay, and potential mortality. Our objective was to determine the learning curve (LC) of CRS/HIPEC in our high-volume institution.


METHODS
A total of 370 patients with PC from mucinous appendiceal neoplasms (MAN = 282), malignant peritoneal mesothelioma (MPM = 60), and gastric cancer (GC = 24) were studied. Outcomes analyzed included incomplete cytoreduction (IC), severe morbidity (SM), 60-day mortality, progression-free survival (PFS), and overall survival (OS). Risk-adjusted sequential probability ratio test (RA-SPRT) was employed to assess the LC of CRS/HIPEC for IC and SM using prespecified odds ratio (OR) boundaries derived from previously published data. Risk adjusted-cumulative average probability (RA-CAP) was used to analyze 1-year PFS and 2-year OS.


RESULTS
Complete cytoreduction, severe morbidity, and 60-day mortality were 84.2, 30, and 1.9 % respectively. Higher simplified peritoneal cancer index was the major independent risk factor for IC, whereas high-grade histology, IC, and diagnosis of MPM and GC (compared with MAN) were predictors of SM after CRS/HIPEC (p < 0.05). RA-SPRT showed that approximately 180 cases are needed to achieve the lowest risk of IC and SM. Ninety cases were needed to achieve a steady 1-year PFS and 2-year OS in RA-CAP plots.


CONCLUSIONS
The completeness of cytoreduction, morbidity, and mortality rates for CRS/HIPEC at our institution are comparable to previously reported data. Approximately 180 and 90 procedures are required to improve operative and oncologic outcomes respectively.
Division of Surgical Oncology, University of Pittsburgh Medical Center, Pittsburgh, PA, USA.
Patricio M
PM
Polanco
Ying
Y
Ding
Jordan M
JM
Knox
Lekshmi
L
Ramalingam
Heather
H
Jones
Melissa E
ME
Hogg
Amer H
AH
Zureikat
Matthew P
MP
Holtzman
James
J
Pingpank
Steven
S
Ahrendt
Herbert J
HJ
Zeh
David L
DL
Bartlett
Haroon A
HA
Choudry
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000627:therapeutic use*; D017024:Chemotherapy, Adjuvant; D010478:Chemotherapy, Cancer, Regional Perfusion; D003131:Combined Modality Therapy; D065426:Cytoreduction Surgical Procedures / Q000401:mortality*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D006979:Hyperthermia, Induced / Q000401:mortality*; D059032:Learning Curve; D008175:Lung Neoplasms / Q000401:mortality* / Q000473:pathology / Q000628:therapy; D008297:Male; D008654:Mesothelioma / Q000401:mortality* / Q000473:pathology / Q000628:therapy; D000086002:Mesothelioma, Malignant; D008875:Middle Aged; D009017:Morbidity; D060787:Neoplasm Grading; D009367:Neoplasm Staging; D010534:Peritoneal Neoplasms / Q000401:mortality* / Q000556:secondary / Q000628:therapy; D011379:Prognosis; D011446:Prospective Studies; D013274:Stomach Neoplasms / Q000401:mortality* / Q000473:pathology / Q000628:therapy; D015996:Survival Rate