Cytoreductive Surgery and Intraperitoneal Hyperthermic

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    Cytoreductive Surgery and Intraperitoneal Hyperthermic

    Chemotherapy With Mitomycin C for Peritoneal Carcinomatosis

    from Nonappendiceal Colorectal Carcinoma

    Perry Shen, MD, Jason Hawksworth, MD, James Lovato, PhD, Brian W. Loggie, MD,

    Kim R. Geisinger, MD, Ronald A. Fleming, PharmD, and Edward A. Levine, MD

    Background: Cytoreductive surgery (CS) and intraperitoneal hyperthermic chemotherapy(IPHC) are efficacious in patients with disseminated mucinous tumors of the appendix. We reviewed

    our experience using this approach for nonappendiceal colorectal cancer (NACC).Methods: We performed a retrospective chart review of a prospective database for patients

    undergoing CS and IPHC with mitomycin C for peritoneal carcinomatosis from colorectal primarylesions between December 1991 and April 2002.

    Results:There were 77 patients, with a median age of 54 years. Peritoneal carcinomatosis wassynchronous and metachronous in 27% and 73% patients, respectively. Seventy-five percent ofpatients (n 58) had received chemotherapy prior to IPHC. Complete resection of all gross diseasewas accomplished in 37 patients (48%). The mean carcinoembryonic antigen level decreased froma preoperative value of 31.2 to a postoperative value of 6.9 (P .0001). Overall survival (OS) at1, 3, and 5 years was 56%, 25%, and 17%, respectively. With a median follow-up of 15 months, themedian OS was 16 months. Perioperative morbidity and mortality were 30% and 12%, respectively.Hematologic toxicity occurred in 15 patients (19%). Cox regression analysis identified poorperformance status (P .018), bowel obstruction (P .001), malignant ascites (P .001), andincomplete resection of gross disease (P .011) as independent predictors of decreased survival.Patients with complete resection of all gross disease had a 5-year OS of 34%, with a median OS of

    28 months.Conclusions: CS and IPHC with mitomycin C can improve outcomes for select patients with

    peritoneal spread from NACC. One third of patients who undergo complete resection of grossdisease have long-term survival.

    Key Words: ChemotherapyColorectal cancerHyperthermiaPeritoneal carcinomatosisSurgery.

    The treatment of patients with peritoneal carcinomatosis

    (PC) from gastrointestinal malignancies is in evolution. PC

    is the most common cause of death in patients resected for

    intra-abdominal carcinomas.1 A multicenter study prospec-

    tively following 370 patients with PC of nongynecologic

    origin revealed a mean and median overall survival (OS) of

    6.0 and 3.1 months, respectively.2

    Surgical resection alone has been demonstrated to be

    ineffective for the treatment of PC, with median surviv-

    als of 1, 1, .7, and 6 months for PC from gastric, small

    bowel, pancreas, and colorectal cancer treated in this

    fashion.3 Attempts at controlling PC with either external

    beam radiation therapy or brachytherapy have failed to

    demonstrate efficacy.4 The use of systemic chemother-

    apy for PC has not been shown to be efficacious, as many

    patients present with PC after systemic chemotherapy

    fails.5

    Received May 8, 2003; accepted October 8, 2003.From Wake Forest University Baptist Medical Center (PS, JH, JL,

    KRG, EAL) and Kucera Pharmaceutical Company (RAF), Winston-

    Salem, NC; and Creighton University Cancer Center (BWL), Omaha,Nebraska.

    Address correspondence and reprint requests to: Perry Shen, MD,

    Surgical Oncology Service, Wake Forest University Medical Center,Medical Center Blvd., Winston-Salem, NC 27157; Fax: 336-716-9758;

    E-mail: [email protected].

    Published by Lippincott Williams & Wilkins 2004 The Society of SurgicalOncology, Inc.

    Annals of Surgical Oncology,11(2):178186

    DOI: 10.1245/ASO.2004.05.009

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    Intraperitoneal administration of chemotherapy has

    the benefit of delivering higher concentrations of cyto-

    toxic drug locally to the site of the tumor while mini-

    mizing systemic toxicity, in comparison with intravenous

    administration. Pharmacokinetic studies have demon-

    strated a 107-fold increase in the concentration of mito-mycin C (MMC) in the intraperitoneal perfusate versus

    plasma concentrations when administered systemically.5

    Recent studies have reported on the combination of cy-

    toreductive surgery and intraoperative intraperitoneal

    chemotherapy612 administered under hyperthermic con-

    ditions (40C to 43C). The administration of intraperi-

    toneal chemotherapy at the time of surgery allows a

    potentially more even distribution of drug, without the

    potential of catheter-related complications and postoper-

    ative adhesions. Hyperthermia has been shown to poten-

    tiate the cytotoxicity of drugs such as MMC and cispla-

    tin.13,14 These interactions are enhanced under hypoxicconditions, which is not true for most agents given after

    surgical resection.

    A report from Sugarbaker and colleagues15 at the

    Washington Cancer Institute described the use of cytore-

    ductive surgery (CS) and intraoperative and periopera-

    tive intraperitoneal chemotherapy with 5-fluorouracil

    and MMC for 385 patients with PC from appendiceal

    malignancy. Patients with complete cytoreduction and

    pathology demonstrating adenomucinosis and adenocar-

    cinoma had 5-year OS rates of 86% and 50%, respec-

    tively. Piso et al.16 also reported their experience with

    intraoperative hyperthermic intraperitoneal cisplatin af-ter peritonectomy procedures for PC from appendiceal

    carcinoma. They reported a mean OS time of 39 months,

    with a 4-year OS rate of 75%. Patients with complete

    versus incomplete cytoreduction had a 4-year OS rate of

    92% and 40%, respectively (P .02). Another study

    report, by Zoetmulder and associates,17 described their

    experience with IPHC with MMC for pseudomyxoma

    peritonei in 46 patients. The actuarial survival rate at 3

    years was 81%. These published results for over 400

    patients provide strong evidence for the use of an ag-

    gressive multimodality approach to this rare disease pro-

    cess, especially when standard surgical therapy results inonly a 10-year OS of 10% to 30%.18 In addition, we

    recently reviewed our experience with 109 patients

    treated with PC from various histologies and found that

    an appendiceal primary was an independent predictor of

    improved survival.19

    Data regarding the use of CS and IPHC for other types

    of histologies have not been as extensively studied. Spe-

    cifically, the treatment of PC from nonappendiceal colo-

    rectal carcinoma (NACC) with CS and IPHC with ad-

    ministration of MMC has been examined in only a

    limited fashion. Both Loggie et al.20 and Sugarbaker et

    al.21 have reported a significant difference in outcome for

    patients with appendiceal versus colorectal primaries.

    Other trials have suggested a benefit of CS and IPHC

    for PC from colorectal cancer, including one prospective

    randomized trial.22,23 However, these trials included ap-pendiceal cancers in their study populations, making it

    difficult to determine the true effect of this approach. We

    reviewed our experience with CS and IPHC using MMC

    for PC from NACC to examine their demographics,

    clinical outcome, predictors of survival, factors contrib-

    uting to postoperative morbidity/mortality, and methods

    to improve patient selection.

    METHODS

    The study protocol was reviewed and approved by the

    Institutional Review Board of the Wake Forest Univer-sity School of Medicine. Eligible patients were enrolled

    in the protocol from December 1991 through April 2002.

    All patients with PC from NACC primaries were en-

    rolled in the study cohort. The Eastern Cooperative On-

    cology Group (ECOG) performance status was recorded

    for all patients enrolled in the protocol.24

    Cytoreductive Surgery

    All patients enrolled in the study protocol were oper-

    ated on by one of three surgeons (BWL, EAL, PS), each

    with significant experience with CS. CS consisted of the

    removal of all gross tumors with involved organs, peri-toneum, or tissue that was deemed technically feasible

    and safe for the patient. Any tumor adherent or invasive

    to vital structures that could not be removed was cytore-

    duced with the Cavitron Ultrasonic Surgical Aspirator

    device. Peritonectomy was performed as indicated. The

    resection status of patients was estimated following CS

    with use of the following classification: R0, complete

    removal of all visible tumor and negative cytology or

    negative microscopic margins; R1, complete removal of

    all visible tumor and positive cytology or microscopic

    margins; R2a, minimal residual tumor, nodule(s) .5 cm;

    R2b, gross residual tumor, nodule

    .5 cm but

    2 cm;and R2c, extensive disease remaining, nodules 2 cm.

    Intraperitoneal Hyperthermic Chemotherapy

    Patients were cooled to a core temperature of about

    34C to 35C by passive measures (i.e., not warming

    airway gases or intravenous solutions and cooling the

    room). After CS was completed, peritoneal perfusion

    inflow and outflow catheters were placed percutaneously

    into the abdominal cavity. Temperature probes were

    placed on the inflow and outflow catheters. The abdom-

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    inal skin incision was closed temporarily with a running

    suture to prevent leakage of peritoneal perfusate. A per-

    fusion circuit was established with approximately 3 L of

    Ringers lactate. Flow rates of approximately 600 to 900

    mL/min were maintained with a roller pump managed by

    the pump technician. The circuit continued through asingle roller pump, through a heat exchanger (SCI-MED,

    No. A-714; Gish Biomedical, Irvine, Ca), and then to the

    patient.

    Constant temperature monitoring was performed with

    temperature probes placed on both the inflow and out-

    flow catheters. Once inflow temperatures exceeded a

    temperature of 38.5C, 30 mg of MMC was added to the

    perfusate, and at 60 minutes an additional 10 mg of

    MMC was added to the perfusate to keep MMC perfus-

    ate concentrations 5 g/mL. A maximum inflow tem-

    perature of 40.5C was achieved during the perfusion,

    with outflow at the pelvis of 39.5C. The abdomen wasgently massaged throughout the perfusion to improve

    drug distribution to all peritoneal surfaces. The total

    perfusion time after the initial addition of MMC was 120

    minutes. In certain patients (elderly, those with extensive

    prior chemotherapy, those with inanition or poor perfor-

    mance status, and those having extensive peritoneal

    stripping during surgery), reductions in the dose of MMC

    (to 30 mg total) and/or the perfusion time (6090 min-

    utes) were made because of concerns about potential

    toxicity. The peritoneum was washed out with 3 L of

    lactated Ringer solution, and the abdomen was reopened

    for removal of perfusion catheters.In 2000, a new perfusion device (ViaCirq, Pittsburgh,

    PA) was introduced that allowed the perfusate to be

    heated to higher temperatures. Subsequent sessions of

    IPHC were conducted with a maximum inflow temper-

    ature of 43C and a minimum outflow temperature of

    40.5C.

    Perioperative Evaluation

    Perioperative morbidity in the database was classified

    into four main groups: bowel leak, respiratory failure,

    infection, and sepsis. Bowel leak was defined by any

    occurrence of an anastomotic leak or bowel perforation,respiratory failure was defined by any extended period of

    mechanical respiration beyond the first 24 hours after

    surgery or any incidence of reintubation (regardless of

    cause), and infection was defined as any infection of the

    wound, abdomen, catheter, blood, or lung. Sepsis was

    defined as a worsening clinical condition requiring man-

    agement in the intensive care unit. Other complications

    not covered by these four categories were also included

    in the database. These included deep venous thrombosis,

    ileus, pneumonia, renal failure, and pleural effusion.

    Clinical Follow-Up

    Clinical follow-up occurred at 1 month, 3 months, and

    then every 3 months thereafter for up to 1 year. After 1

    year, follow-up was at 3-month intervals or less fre-

    quently if the patient continued to remain without evi-

    dence of disease. Abdominal and pelvic CT scans wereobtained at 3, 6, and 12 months postoperatively or when

    clinically indicated. Some patients received systemic

    chemotherapy after referral back to their medical

    oncologists.

    Statistical Analysis

    OS was calculated from the date of CS and IPHC to

    the last recorded date of follow-up or recorded date of

    death. All data were collected prospectively. Kaplan-

    Meier analysis was performed on all pertinent clinico-

    pathologic variables to determine estimates of survival

    over time. Group comparisons of OS were done with thelog-rank test. Coxs proportional hazards regression

    model was used to perform multivariate analysis of clin-

    icopathologic factors to determine independent predic-

    tors of OS. Fishers exact test was used to correlate type

    of surgical procedure with postoperative morbidity. A P

    value .05 was considered significant for the purposes

    of this manuscript.

    RESULTS

    Patients

    A total of 77 patients with PC from NACC wereenrolled in the protocol. Table 1 lists demographic char-

    acteristics and baseline data. The median age was 54

    years. The primary sites were 74 in the colon and 3 in the

    rectum. All patients had a histologic diagnosis of adeno-

    carcinoma. PC was synchronous and metachronous in

    27% and 73% of patients, respectively. In those with

    metachronous presentation, median disease-free interval

    between primary diagnosis and peritoneal disease was 14

    months (range, 3 to 85 months). More than three quarters

    of patients had undergone prior surgery or chemother-

    apy. About one third of patients presented with either

    bowel obstruction or malignant ascites. Complete resec-tion of all gross disease was accomplished in 37 patients

    (48%). Table 2 correlates resection status with type of

    surgical procedure performed. Pre-IPHC cytology was

    not performed or the results were not available in ap-

    proximately one quarter of patients.

    Survival and Follow-Up

    For the cohort of 77 patients, 3-year and 5-year OS

    was 25% and 17%, respectively. The median OS was 16

    months (95% confidence interval [CI], 1026) with a

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    median follow-up of 15 months. Table 3 displays the

    results of a log-rank analysis of multiple clinical and

    pathologic variables. Fifty-two patients (68%) have had a

    recurrence, with a median time to progression of 7

    months (range, 331). The mean carcinoembryonic an-

    tigen decreased from a preoperative value of 31.2 to

    postoperative value of 6.9 (P

    .0001).Multivariate analysis demonstrated four clinicopatho-

    logic factors that were independent predictors of OS

    (Table 4): performance status (ECOG) of 0/1, R0/1 re-

    section, no bowel obstruction, and no malignant ascites.

    Figs. 14 depict the log-rank survival curves for these

    factors.

    Morbidity and Mortality

    Perioperative morbidity and mortality were 30% and

    12%, respectively. Mortality was calculated as postoper-

    ative deaths directly attributable to the procedure, regard-

    less of the time interval since the operation. Causes of

    death included bowel perforation (n 2), bone marrow

    suppression (n 2), respiratory failure (n 4), and

    anastomotic leak (n 1). In the patient group with all the

    independent predictors of OS (ECOG performance statusof 0/1, R0/1 resection, no bowel obstruction, no malig-

    nant ascites), the perioperative mortality was 4% (1/25).

    Fifteen subjects (19%) developed hematologic toxicity

    requiring growth factor support or platelet transfusion.

    Thirty-three patients (43%) required a blood transfusion,

    with a median of 2 units (range, 117) transfused. The

    median operative time and length of hospital stay for CS

    and IPHC were 9 hours (range, 516) and 10 days (range,

    5150), respectively.

    Chi-square analysis and Fishers exact test were used

    to correlate the occurrence of a perioperative complica-

    tion (bowel leak, infection, respiratory failure, sepsis)with the performance of either a bowel resection (n

    49) or bowel anastomosis (n 42). Patients with resec-

    tion but no anastomosis had ostomies created. There was

    no correlation of either bowel resection or anastomosis

    with perioperative complications as a group. However,

    when complications were individually analyzed against

    bowel resection and anastomosis, there was a significant

    correlation of sepsis with bowel anastomosis (P .0032)

    (see Table 5).

    Delivery of Intraperitoneal and Adjuvant

    ChemotherapySixty-one patients (79%) received the standard intra-

    peritoneal 2-hour perfusion of 40 mg MMC. Another

    three patients (4%) underwent a 2-hour perfusion, but

    two of them received 30 mg MMC and one especially

    large patient received 50 mg MMC. Twelve patients

    underwent a 1-hour perfusion with the following

    amounts of MMC administered: for three patients (4%),

    40 mg, and for nine (12%), 30 mg. One patient received

    40 mg MMC in a 1.5-hour perfusion.

    DISCUSSION

    In 1995 Sugarbaker et al.21 published their experience

    using perioperative intraperitoneal 5-fluorouracil and

    MMC without hyperthermia for patients with PC sec-

    ondary to appendiceal and colorectal cancer. The 3-year

    OS rates for the appendiceal and colorectal PC patients

    were 70% and 30%, respectively (P .0001). In 2000,

    Loggie et al.20 published a report from our institution

    examining the outcomes for patients with disseminated

    peritoneal cancer of gastrointestinal origin. The median

    OS of patients with colorectal primaries was 15 months.

    TABLE 1. Patient demographics and baseline data

    Baseline clinicopathologic variables

    No.

    (%)

    Total 77 (100)

    Age

    55 y 41 (53)55 y 36 (47)

    SexMale 45 (58)

    Female 32 (42)Race

    White 73 (95)

    Black 4 (5)Previous treatment

    Surgery 67 (87)Chemotherapy 58 (75)Radiation 6 (8)

    Performance status (ECOG)0 18 (23)1 46 (60)

    2 7 (9)

    3 2 (3)4 4 (5)

    Bowel obstructionYes 22 (29)

    No 55 (71)Malignant ascites

    Yes 26 (34)No 51 (66)

    Liver metastases

    Yes 10 (13)No 65 (84)Unknown 2 (3)

    HistologyMucinous 43 (56)

    Signet ring cell 7 (9)Not otherwise specified 27 (35)

    Pre-IPHC cytologyPositive 31 (40)Negative 28 (36)

    Unknown 18 (24)

    ECOG, Eastern Cooperative Oncology Group; IPHC, intraperitonealhyperthermic chemotherapy.

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    The median OS for appendiceal primaries had not been

    reached. A study in France by Elias and associates22 used

    both early intraperitoneal and hyperthermic intraopera-

    tive intraperitoneal chemotherapy with a combination ofagents: 5-fluorouracil, MMC, and cisplatin. The results

    of two separate trials were combined in one report.22 The

    study cohort was patients with PC arising from colorectal

    adenocarcinomas, of which 14% were mucinous cancers

    of the appendix. All patients in this study had an R0/1

    resection with all gross disease removed. The 5-year OS

    was 27%, with a median OS of 36 months. These results

    are comparable to those for our subset of patients with a

    similar type of resection status.

    A prospective study on the natural history of PC from

    colorectal cancer demonstrated a median OS of 5

    months.2

    This subset of patients did not includepseudomyxoma peritonei. The median OS of patients in

    our study was 16 months, with a 5-year OS of 17%.

    Three quarters of the patients had already undergone

    systemic chemotherapy for metastatic disease that failed.

    Univariate predictors of survival were performance sta-

    tus, resection status, bowel obstruction status, malignant

    ascites status, liver metastases status, and pre-IPHC cy-

    tology status. The best outcomes were for patients un-

    dergoing an R0 resection, which yielded a 5-year OS of

    55%, with a median OS that has not yet been reached.

    On multivariate Cox regression analysis, only four

    factors remained independent predictors of OS: ECOG

    performance status of 0/1, R0/1 resection status, absence

    of bowel obstruction, and absence of malignant ascites.Two of these factorsperformance status and bowel

    obstructionappear to favor patients who will best tol-

    erate the significant physiological stress induced by the

    multimodality application of not only extensive CS but

    also IPHC. The other two factorsresection status and

    ascitesappear to identify patients with more limited

    disease that best responds to CS and IPHC from an

    oncologic perspective. Three of these four factors can be

    determined preoperatively and help to optimize patient

    selection. The fourth factor, resection status, is a variable

    that is most accurately determined intraoperatively. The

    use of a peritoneal carcinomatosis index has been re-ported to be predictive of resectability in patients with

    PC.15 However, because this index can be determined

    only at the time of laparotomy, it does not help prevent

    unnecessary surgery.

    Complications after CS and IPHC can be due to the

    extensive surgery or the intraperitoneal chemotherapy or

    the combination of both. Major peritonectomy proce-

    dures were not performed when cytoreduction with the

    Cavitron Ultrasonic Surgical Aspirator was possible. The

    most significant detrimental effect is on the hematologic,

    TABLE 2. Surgical procedures correlated with resection status

    Procedure R0 R1 R2a R2b R2c Total

    Tumor debulking 7 15 3 4 10 39Retroperitoneal LND 2 3 5

    Small bowel resection 3 9 7 5 6 30

    Splenectomy 3 4 4 1 1 13Colon resection 7 5 8 4 4 28

    Rectum resection 2 6 3 1 12Omentectomy 6 13 10 4 10 43

    Bladder 1 1Umbilicus resection 2 1 3 6Pancreas resection 2 2 1 3 8

    Colostomy 3 3 1 3 10Gastrostomy 4 4

    Tube thoracostomy 1 1 2Salpingo-oopherectomy 1 7 3 4 15Hysterectomy 4 1 5

    Peritonectomy 1 1 2Liver resection 1 2 2 2 7Cholecystectomy 2 3 1 1 7

    Hepatic cryoablation 2 1 3

    Appendectomy 1 1 3 5Diaphragm excision 1 1 2Gastrectomy 1 1 2Nephrouterectomy 1 1

    Abdominal wallexcision

    1 1

    Total 34 85 58 22 52

    LND, lymph node dissection.

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    pulmonary, and gastrointestinal organ systems.25 The

    perioperative morbidity and mortality in our study cohort

    were 30% and 12%, respectively. Although the morbid-

    ity compares favorably with that in other published se-

    ries, the mortality is substantial for any surgical proce-dure, especially one that is performed with palliative

    intent. However, we counted all deaths related to CS and

    IPHC, not limiting the number to deaths occurring only

    within 30 days of the procedure.

    Respiratory failure accounted for 44% of the peri-

    operative deaths. MMC has been reported to cause

    adult respiratory distress syndrome in patients exposed

    to FIO2 concentrations greater than 50% periopera-

    tively.26 This complication usually manifests after

    multiple doses in patients given the drug systemically

    with other chemotherapy combinations. The marrow

    toxicity that can occur with MMC usually occurs 4 8

    weeks after systemic administration,26 but the two

    patients who developed fatal myelosuppression had

    evidence of hematologic toxicity within 72 hours ofIPHC. Previous studies have shown that platelet

    counts begin to decline after the procedure and typi-

    cally return to normal values within 12 weeks.27,28

    The differences in timing of nadir counts between

    IPHC and intravenous bolus MMC may be due to

    kinetic differences from the two administration

    schedules.

    We have previously reported that there is a direct

    relationship between hematologic toxicity and MMC

    concentrations in plasma.29 The AUCs of MMC in

    TABLE 3. Univariate analysis of clinical and pathologic variables for overall survival

    Factor n Expired

    Percent Surviving (SE) Survival (mo)

    P value3 y 5 y Median 95% CI

    Overall 77 45 25.0 (2.5) 17.3 (3.3) 15.9 10.225.5

    Age .98855 41 24 22.0 (3.8) 17.6 (4.4) 17.8 6.432.8

    55 36 21 28.1 (3.3) 28.1 (4.8) 14.6 10.036.2

    Race .716White 73 42 26.2 (2.5) 18.2 (3.3) 15.9 10.225.5

    Nonwhite 4 3 .0 (NA) .0 (NA) 18.6 3.85NA

    Gender .619

    Male 45 25 25.9 (3.3) 17.3 (4.4) 12.7 5.432.8Female 32 20 24.1 (3.8) 16.0 (5.6) 15.9 11.747.7

    Prior surgery .284

    No 10 6 40.5 (4.3) 27.0 (5.9) 25.5 10.0NAYes 67 39 22.2 (3.0) 15.5 (3.9) 12.7 10.223.0

    Prior chemotherapy .439

    No 19 10 19.6 (6.2) 9.8 (9.5) 16.4 14.6NAYes 58 35 26.1 (2.7) 19.3 (3.4) 10.4 5.432.3

    Prior radiation .314

    No 71 40 28.1 (2.4) 19.5 (3.3) 14.6 10.232.3Yes 6 5 .0 (NA) .0 (NA) 16.4 3.5NA

    Performance status .000401 64 33 32.0 (2.4) 22.1 (3.2) 17.8 12.536.2

    24 13 12 .0 (NA) .0 (NA) 3.8 2.0NA

    Resection status .0005R0 13 4 69.2 (2.2) 55.3 (3.1) NR 16.4NA

    R1 24 11 19.1 (6.2) 19.1 (6.2) 17.8 10.2NAR2a 11 7 28.0 (5.9) 14.0 (9.2) 12.7 4.2NAR2b 9 6 .0 (NA) .0 (NA) 4.1 3.5NA

    R2c 20 17 6.0 (9.7) .0 (NA) 5.0 2.418.2

    Bowel obstruction .0001

    No 55 30 32.4 (2.4) 22.4 (3.2) 20.9 12.736.2Yes 22 15 .0 (NA) .0 (NA) 4.1 2.0NA

    Malignant ascites .0001

    No 51 27 32.7 (2.5) 22.1 (3.4) 20.9 15.938.9Yes 26 18 6.9 (9.5) 6.9 (9.5) 4.2 2.410.4

    Liver metastases .031No 65 35 26.6 (2.7) 19.4 (3.5) 15.9 10.232.3Yes 10 9 12.0 (9.3) .0 (NA) 12.7 1.5NA

    Pre-IPHC cytology .004Negative 28 15 44.9 (2.4) 33.2 (3.2) 27.8 11.7NAPositive 31 23 9.4 (6.7) 4.7 (9.7) 9.9 4.219.6

    SE, standard error; CI, confidence interval; NA, not applicable; NR, not reached; IPHC, intraperitoneal hyperthermic chemotherapy.

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    plasma after a 2-hour IPHC perfusion are similar to thatobserved after an intravenous bolus of MMC. The dosing

    rationale for MMC during IPHC was to achieve a peri-

    toneal concentration of 510 g/mL in a fixed volume of

    perfusate, versus the standard practice of dosing by body

    surface area. Several recent reviews in the oncology

    literature question whether dosing by body surface area

    is any better than fixed dosing.3032 Given the tremen-

    dous pharmacokinetic variations between patients, dos-

    ing differences by body surface area may not be signif-

    icant when the real sources of variability are the organs

    (or enzymes, etc.) responsible for drug elimination (renal

    function for renally eliminated drugs and hepatic func-

    tion for hepatically cleared drugs).

    Three of the patients died of either bowel leak or

    perforation, which appears more plausible given the of-

    ten extensive nature of the surgery and evidence from

    animal models that intraperitoneal chemotherapy with

    MMC has an adverse effect on anastomotic bowel heal-

    ing.33 It is interesting that only one of these deaths was

    due to an anastomotic leak, whereas the other two pa-

    tients who died developed bowel perforations at a site

    other than the anastomosis. The two patients with perfo-

    rations presented with bowel obstruction, whereas the

    patient with an anastomotic leak had obstructive jaun-

    dice. Cox regression analysis has clearly identified bowel

    obstruction as an independent predictor of decreased OS,

    and we no longer perform IPHC in such patients. When

    we conducted a Fishers exact test to correlate the pres-

    ence of a bowel resection or anastomosis with compli-

    cations, we found that the presence of a bowel anasto-

    mosis was significantly correlated with sepsis. However,

    on Cox regression analysis (Table 4), the hazard ratio for

    bowel anastomosis was .9. It appears the creation of a

    FIG. 1. Overall survival as related to performance status (EasternCooperative Oncology Group). FIG. 3. Overall survival as related to bowel obstruction.

    TABLE 4. Cox regression analysis of overall survival

    Factor Hazard ratio 95% CI P value

    Age

    55 vs. 55 .97 .501.85 .92

    Race

    Nonwhite vs. white .84 .252.89 .79Sex

    Female vs. male 1.69 .863.32 .13Performance status

    2 vs. 0/1 2.36 1.164.82 .018Resection status

    R2 vs. R0/1 2.35 1.224.55 .011

    Bowel obstruction present 3.47 1.627.44 .001Ascites present 3.23 1.636.38 .001

    Liver metastases present 2.13 .905.07 .087Lymph node involvement 1.35 .712.58 .370Anastamosis present .90 .431.89 .790

    CI, confidence interval.

    FIG. 2. Overall survival as related to resection status.

    184 P. SHEN ET AL.

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    bowel anastomosis may increase the risk of perioperative

    complications but not perioperative mortality. Although

    we do not believe bowel anastomosis during IPHC is

    contraindicated, we believe its association with periop-

    erative complications should be considered in light of the

    patients overall status, especially when the creation of a

    stoma is another option.

    When perioperative mortality among patients with the

    independent predictors of OS was assessed, the death

    rate was 4%. This conclusion should not be surprising,

    because these are the patients who presented in the best

    physiological condition with grossly resectable disease.Our experience with these 77 patients reflects an aggres-

    sive approach for patients with advanced cancer who

    have few meaningful therapeutic options. Some of these

    patients presented in poor health due to their malignant

    disease, and the perioperative mortality reflects the tre-

    mendous stress this multimodality approach places on

    the patient. However, our data clearly demonstrate that

    for select patients with PC from NACC, the application

    of CS and IPHC with MMC can extend survival. Other

    reports from our institution have shown that quality of

    life, a vital parameter for the evaluation of palliative

    interventions, is also preserved for the majority of pa-tients, both in the short term and in the long term.34,35

    One criticism of the use of CS and IPHC is the lack of

    randomized, controlled trials confirming its efficacy in

    comparison with supportive care, surgery alone, or sys-

    temic chemotherapy. A recent prospective trial in Europe

    randomized 104 patients with PC from colorectal adeno-

    carcinoma to CS and IPHC with MMC, followed by

    systemic therapy with 5-fluorouracil/leucovorin, in com-

    parison with CS and systemic 5-fluorouracil/leucovorin

    alone. With a mean follow-up of 24 months, the 2-year

    OS was 43% in the IPHC arm (median OS, 21 months)

    and 16% in the standard therapy arm (median OS, 10

    months) (P .0145).23 Previous studies of untreated

    patients with metastatic colorectal cancer have revealed

    median OS of 1419 months with the use of new sys-

    temic chemotherapeutic agents such as irinotecan and

    oxaliplatin.3638 Our study revealed that patients under-

    going R0/1 resection had a median OS of 28 months. Inaddition, our study provides information on which clin-

    icopathologic factors predict improved outcome from

    this procedure.

    Future research directions may include the use of

    molecular markers to determine which patients will de-

    rive the most benefit. Just as the preoperative carcino-

    embryonic antigen level was seen to significantly de-

    crease after CS and IPHC, investigations with other

    surrogate markers may yield more prognostic informa-

    tion. We previously reported that the presence of a poly-

    morphism that causes reduced activity of quinone oxi-

    doreductase 1 (NQO1) is associated with a decrease insurvival for patients undergoing CS and IPHC for PC.39

    NQO1 is important in the activation of MMC. Such a

    mutation found in tumor tissue of patients with PC may

    identify those who should be treated with agents other

    than MMC or undergo alternative treatments. Multi-

    center trials are needed to confirm these findings and

    improve perioperative and long-term outcome.

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