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Original Article |

Predictors of Nonsentinel Node Metastasis in Patients With Breast Cancer After Sentinel Node Metastasis FREE

Kathie-Ann Joseph, MD, MPH; Mahmoud El-Tamer, MD; Ian Komenaka, MD; Andrea Troxel, ScD; Beth Ann Ditkoff, MD; Freya Schnabel
[+] Author Affiliations

From the Department of Surgery, Columbia Presbyterian Comprehensive Breast Center, New York Presbyterian Hospital (Drs Joseph, El-Tamer, Komenaka, Ditkoff, and Schnabel), and the Department of Biostatistics, Mailman School of Public Health, Columbia University (Dr Troxel), New York, NY.


Arch Surg. 2004;139(6):648-651. doi:10.1001/archsurg.139.6.648.
Text Size: A A A
Published online

Hypothesis  The presence of nonsentinel lymph node (NSLN) metastasis after having a positive sentinel lymph node dissection finding is associated with tumor size and stage, the presence of lymphovascular invasion, micrometastasis, and extranodal extension.

Design  Retrospective case series.

Setting  University hospital.

Patients  Four hundred seven consecutive patients at a single institution who underwent sentinel lymph node dissection as part of breast conservation or mastectomy with biopsy-proved cancer.

Intervention  Completion axillary lymph node dissection and definitive therapy.

Main Outcome Measures  Sentinel node metastasis, NSLN metastasis, tumor size and stage, lymphovacular invasion, micrometastasis, extronodal extension, histological tumor characteristics, and number of sentinel nodes removed.

Results  In a univariate analysis, size of the primary tumor and extranodal extension were associated with having positive NSLN findings. The presence of micrometastasis was associated with negative NSLN findings. When all factors were included in a logistic regression analysis, the significant predictor of NSLN metastasis was extranodal extension (P = .002). Lymphovascular invasion was not associated with positive NSLN findings (P = .11). The number of sentinel nodes removed also had no bearing on the status of the NSLNs (P = .37).

Conclusions  Although primary tumor size and micrometastases correlate with the status of the NSLNs, extranodal extension is the most important independent predictor of NSLN metastasis. These findings may ultimately spare patients a full axillary lymph node dissection. However, pending results of larger clinical trials, full axillary lymph node dissection is still recommended for patients with sentinel lymph node metastases.

During the past 3 decades, the surgical management of breast cancer has changed significantly. Several large multicenter trials have established that lumpectomy followed by radiation therapy, or breast conservation, is no different in terms of overall survival than mastectomy.15 With the advent of sentinel node biopsy, a similar shift in the paradigm to minimal axillary surgery is also evolving in the management of axillary disease in breast cancer.

Because axillary lymph node involvement is the most important prognostic factor in patients with breast cancer, the status of the axilla is an essential component of staging in patients with breast cancer.610 However, axillary dissection is not without morbidity. Arm lymphedema is one of the major complications of axillary dissection, particularly when patients also undergo radiation therapy.1114 Other complications such as neuropathies, seromas, and wound infections also affect a significant number of patients.

Most patients with stages I and II breast cancer do not have axillary lymph node metastasis. Sentinel node biopsy has proved to be an important tool in sparing a large population of women with breast cancer from a full axillary lymph node dissection (ALND). Women who have negative sentinel node findings do not have to undergo a full ALND. However, the current accepted practice is to perform a full ALND when the sentinel node finding is positive. Attempts have been made to help identify the subset of patients with positive sentinel node findings who could be spared a full ALND because of the low likelihood of nonsentinel lymph node (NSLN) metastasis. Previous studies have shown that as many as 50% to 65% of patients with sentinel node metastasis have no other axillary metastasis.15,16 The benefit of performing a complete ALND on these patients is being called into question. We aim in this study to identify those factors most likely to be associated with NSLN metastasis.

An analysis of our prospective database was performed of all sentinel lymph node dissections (SLNDs) performed at Columbia Presbyterian Center, New York, NY, from January 1, 1998, to September 30, 2001. The SLND was performed as part of breast conservation surgery or mastectomy in all patients with biopsy-proved breast cancer. The sentinel node was identified using a combination of 1% isosulfan blue dye as described by Giuliano et al17 and technetium Tc 99m sulfur colloid as a radioactive tracer. The isosulfan blue dye was administered in a peritumoral fashion at the time of surgery, and the radioactive tracer was injected the day before or in some cases the morning of the surgery. All sentinel nodes were submitted to pathology for analysis using hematoxylin-eosin and immunohistochemical staining for cytokeratin. For all patients, age, tumor size, histological tumor characteristics, and the numbers of sentinel nodes removed, positive sentinel node findings, NSLN removed, and positive NSLN findings (NSLN+) were recorded.

We performed statistical analysis using the χ2 test for categorical variables; an unpaired, 2-tailed t test for continuous variables; and multivariate analysis to determine if any of these markers alone or in combination would predict the status of the NSLN. We calculated and present odds ratios (ORs) and P values. Statistical significance was evaluated at the .05 α level.

A total of 407 patients were included in this study. Of these, 70 (17%) had positive SLND findings. The mean age of this group was 54.9 years (range, 32-77 years). Fifty-three patients (76%) had negative ALND findings, and 17 (24%) had positive ALND findings. The mean number of sentinel nodes removed was 2.35. Table 1 gives tumor size and stage, status of lymphovascular invasion (LVI), extranodal extension, and histological tumor characteristics. The mean tumor size of these 70 patients with positive SLND findings was 1.8 cm (range, 0.1-7.2 cm; SD, 1.17 cm). More than half of the patients (n = 36) had T1c lesions. The most common histological finding was invasive ductal carcinoma (57%). Thirty-five patients (50%) had lymphatic invasion in their sentinel nodes, but 19 (27%) had extranodal extension.

Table Graphic Jump LocationTable 1. Patient and Tumor Characteristics

When comparing those patients with NSLN+ with patients who had negative nonsentinel node findings (NSLN−), we find that although 70% of those patients with NSLN+ presented with LVI, only 43% of patients with NSLN− had LVI (Table 2). This difference, however, did not reach statistical significance (P = .11). Extranodal extension was found in 59% of patients with NSLN+ vs only 13% of patients with NSLN− (Table 2). This association was statistically significant (OR, 9.01; 95% confidence interval [CI], 0.03-0.39; P = .002). Only 5 patients with NSLN+ had micrometastases in their SLND vs 29 patients in the NSLN− group (Table 2). This association was also statistically significant on results of univariate analysis (OR, 3.16; 95% CI, 0.10-1.03; P = .06). Mean tumor size was another factor found to be statistically significant between the NSLN− and NSLN+ groups (OR, 1.69; 95% CI, 1.04-2.75; P = .04). Estrogen receptor status and progesterone receptor status of the primary tumor were not statistically significant on univariate analysis (P = .11 and P = .33, respectively; results not shown). These results are summarized in Table 3. The number of sentinel nodes removed was also examined to see whether the number of NSLN+ was related to the initial number of sentinel nodes removed. This association did not approach statistical significance (P = .37).

Table Graphic Jump LocationTable 2. Pathological Features Evaluated in Terms of Presence or Absence of Nonsentinel Lymph Node Metastasis
Table Graphic Jump LocationTable 3. Analyses of Factors Associated With NSLN Metastasis

When these data variables were subject to multivariate logistic regression, extranodal extension was the statistically significant factor (OR, 9.0; 95% CI, 2.6-31.3; P = .002) (Table 3).

Full ALND is the gold standard for evaluating the axilla for evidence of metastatic disease. However, ALND is not without its morbidity. Long-term complications due to ALND include diminished sensation, paresthesia, loss of motor function, and lymphedema. Nevertheless, the status of the axillary lymph nodes is considered the most significant prognostic factor for breast cancer patients.18,19 Sentinel lymph node dissection has been proved to be a sensitive technique for sampling the axilla for metastatic disease while being less invasive.20

Several efforts have been made to identify those patients in whom the status of the sentinel lymph node would accurately predict which ones would need a full ALND and those patients in whom a negative SLND finding would reliably imply that no further surgery would be necessary.2024 We found on univariate analysis that tumor size and extranodal extension were significantly associated with presence of NSLN involvement of metastasis. In addition, the presence of micrometastasis is predictive of negative NSLN involvement. In their review of 157 patients who underwent SLND during a 6-year period, Chu et al21 found that 33.5% had positive sentinel lymph node findings. The most important predictors of NSLN metastases in their study were size of sentinel node metastasis and tumor size. In a series by Weiser et al20 of 1000 patients who underwent successful SLND, 231 patients (23%) had positive sentinel lymph node findings.20 The critical factors in their study that contributed to NSLN metastasis were tumor size, LVI, and sentinel lymph node micrometastasis. Other attempts to identify predictors of NSLN metastases, such as the study by Abdessalam et al,23 also found LVI along with extranodal extension and micrometastasis of the sentinel lymph node to correlate with NSLN metastasis. These studies are consistent with our series in determining that primary tumor size, micrometastasis, and extranodal extension correlate with NSLN metastasis. Another study published by Sachdev et al24 also found LVI along with macroinvasion and tumor size as predictors of NSLN metastasis. In their study, the sample size was 190 patients, of whom 29% had sentinel lymph node metastasis. Although these studies found a significant association between LVI and NSLN metastasis, we did not find the same association in our review. This could be in part due to our small sample size of 70 cases vs the larger series published previously. Although our own study did not find a significant correlation, perhaps because of small sample size (type II error), the larger studies suggest that the presence of LVI in the sentinel node is a significant predictor of NSLN metastasis.

We found extranodal extension to be a significant predictor of NSLN metastasis. Although 83% of patients with NSLN− did not have extranodal extension, 59% of patients with NSLN+ did. Two other studies23,25 included extranodal extension in determining an association with NSLN metastasis. Abdessalam et al23 found extranodal extension to be significantly associated with NSLN metastasis. Some of the studies previously mentioned20,21 did not specifically look at this variable. Another series by Turner et al,25 which also attempted to identify pathological features associated with NSLN metastasis, found extranodal extension to be strongly associated with NSLN metastasis. Extranodal extension is a significant prognostic factor for the remaining lymph node basin because it usually represents tumor cells in transit.25

Micrometastasis was a significant negative predictor of NSLN metastasis on results of univariate analysis. In our series, 70% of the NSLN+ group did not have micrometastasis. However, almost half of the NSLN− group also did not have micrometastasis. It could be that micrometastasis in association with tumor size is a better predictor of NSLN metastasis. In their series, Turner et al25 also speculated that micrometastasis along with unfavorable tumor characteristics would most likely better predict those patients who could benefit from a complete ALND.

The introduction of SLND into the armamentarium of breast surgical management has revolutionized the management of the axilla in breast cancer patients. However, like all innovative techniques, it raises more issues than it answers. Given the morbidity of full ALND and the low proportion of patients who present now with NSLN metastasis, a method to identify patients who could be spared full ALND would be beneficial. In our study, we found that tumor size and extranodal extension are significant predictors of NSLN metastasis, and that micrometastasis is a significant predictor of negative NSLN metastasis. However, none of these factors alone is sufficient to be applied clinically. Several other groups have also attempted to answer this question and have come to different conclusions. Until the results of ongoing large randomized trials2628 such as the ACOSOG-Z0011 and the NSABP-B32 provide more substantive data, completion ALND should remain the appropriate management for patients with sentinel lymph node metastases.

Accepted for publication November 18, 2003.

This study was presented at the Society of Surgical Oncology Cancer Symposium; March 7, 2003; Los Angeles, Calif.

Corresponding author and reprints: Kathie-Ann Joseph, MD, MPH, 161 Fort Washington Ave, Suite 1025, New York, NY 10032, (e-mail: kpr2@columbia.edu).

Veronesi  UCascinelli  NMariani  L  et al.  Twenty-year follow-up of a randomized study comparing breast-conserving surgery with radical mastectomy for early breast cancer. N Engl J Med. 2002;3471227- 1232
PubMed Link to Article
Fisher  BAnderson  SBryant  J  et al.  Twenty-year follow-up of a randomized trial comparing total mastectomy, lumpectomy, and lumpectomy plus irradiation for the treatment of invasive breast cancer. N Engl J Med. 2002;3471233- 1241
PubMed Link to Article
Fisher  BBauer  MMargolese  R  et al.  Five-year results of randomized clinical trial comparing total mastectomy and segmental mastectomy with or without radiation in the treatment of breast cancer. N Engl J Med. 1985;312665- 673
PubMed Link to Article
Veronesi  USaccozzi  RDel Vecchio  M  et al.  Camparing radical mastectomy with quadrentectomy, axillary dissection, and radiation therapy in patients with small cancers of the breast. N Engl J Med. 1981;3056- 11
PubMed Link to Article
Fisher  BCostantino  JRedmond  C  et al.  Lumpectomy compared with lumpectomy and radiation therapy for the treatment of intraductal cancer. N Engl J Med. 1993;3281581- 1586
PubMed Link to Article
Carter  CLAllen  CHenson  DE Relation of tumor size, lymph node status and survival in 24 240 breast cancer cases. Cancer. 1989;63181- 187
PubMed Link to Article
Fisher  BBauer  MWickerham  L  et al.  Relation of number of positive nodes to the prognosis of patients with primary breast cancer: an NSABP update. Cancer. 1983;521551- 1557
PubMed Link to Article
Walls  JBoggis  CRMWilson  M  et al.  Treatment of the axilla in the patients with screen-detected breast cancer. Br J Surg. 1993;80436- 438
PubMed Link to Article
Giuliano  ABarch  AMSpivack  BBeitsch  PDEvans  SW Incidence and predictors of axillary metastasis in T1 carcinoma of the breast. J Am Coll Surg. 1996;183185- 189
PubMed
Fisher  BSlack  NHAusman  RKBross  ID Location of breast carcinoma and prognosis. Surg Gynecol Obstet. 1969;129705- 716
PubMed
Swedborg  IWallgren  A The effect of pre- and postmastectomy radiotherapy on the degree of edema, shoulder joint mobility and gripping force. Cancer. 1981;47877- 881
PubMed Link to Article
Kissin  MWQuerci della Rovere  GEaston  DWestbury  G Risk of lymphoedema following the treatment of breast cancer. Br J Surg. 1986;73580- 584
PubMed Link to Article
Benson  EAThorogood  J The effect of surgical techniqe on local recurrence rates following mastectomy. Eur J Surg Oncol. 1986;12267- 271
PubMed
Delouche  GBachelot  FPremont  MKurtz  JM Conservation treatment of early breast cancer: long term results and complications. Int J Radiat Oncol Biol Phys. 1987;1329- 34
PubMed Link to Article
Gajdos  CTartter  PIBleiweiss  IJ Lymphatic invasion, tumor size, and age are independent predictors of axillary lymph node metastases in women with T1 breast cancers. Ann Surg. 1999;230692- 696
PubMed Link to Article
Rivadeneira  DESimmons  RMChristos  PJHanna  KDaly  JMOsborne  MP Predictive factors associated with axillary lymph node metastases in T1a and T1b breast carcinomas: analysis in more than 900 patients. J Am Coll Surg. 2000;1911- 6discussion6- 8
PubMed Link to Article
Giuliano  AEKirgan  DMGuenther  JMMorton  DL Lymphatic mapping and sentinel lymphadenectomy for breast cancer. Ann Surg. 1994;220391- 401
PubMed Link to Article
Harris  JRLippman  MEVeronesi  UWillet  W Breast cancer (3). N Engl J Med. 1992;327473- 480
PubMed Link to Article
Mansour  EGRavdi  PMDressler  L Prognostic factors in early breast carcinoma. Cancer. 1994;74381- 400
PubMed Link to Article
Weiser  RWMontgomery  LLTank  LK  et al.  Lymphovascular invasion enhances the prediction of nonsentinel node metastases in breast cancer patients with positive sentinel nodes. Ann Surg Oncol. 2001;8145- 149
PubMed Link to Article
Chu  KTurner  RHansen  NBrennan  MBBilchik  AGiuliano  A Do all patients with sentinel node metastasis from breast cancer need complete axillary node dissection? Ann Surg. 1999;229536- 541
PubMed Link to Article
Reynolds  CMick  RDonohue  JH  et al.  Sentinel lymph node biopsy with metastasis: can axillary dissection be avoided in some patients with breast cancer? J Clin Oncol. 1999;171720- 1726
PubMed
Abdessalam  SZervos  EPrasad  M  et al.  Predictors of positive axillary lymph nodes after sentinel lymph node biopsy in breast cancer. Am J Surg. 2001;182316- 320
PubMed Link to Article
Sachdev  UMurphy  KDerzie  AJaffer  SBleiweiss  IJBrower  S Predictors of nonsentinel lymph node metastasis in breast cancer patients. Am J Surg. 2002;183213- 217
PubMed Link to Article
Turner  RChu  KQi  K  et al.  Pathologic features associated with nonsentinel lymph node metastases in patients with metastatic breast carcinoma in a sentinel lymph node. Cancer. 2000;89574- 581
PubMed Link to Article
Ross  MI Sentinel node dissection in early-stage breast cancer: ongoing prospective randomized trials in the USA. Ann Surg Oncol. 2001;9 ((suppl)) 77S- 81S
PubMed
Grube  BJGiuliano  AE Observation of the breast cancer patient with a tumor-positive sentinel node: implications of the ACOSOG Z0011 trial. Semin Surg Oncol. 2001;20230- 237
Link to Article
Harlow  SPKrag  DN Sentinel lymph node—why study it: implications of the B-32 study. Semin Surg Oncol. 2001;20224- 229
Link to Article

Figures

Tables

Table Graphic Jump LocationTable 1. Patient and Tumor Characteristics
Table Graphic Jump LocationTable 2. Pathological Features Evaluated in Terms of Presence or Absence of Nonsentinel Lymph Node Metastasis
Table Graphic Jump LocationTable 3. Analyses of Factors Associated With NSLN Metastasis

References

Veronesi  UCascinelli  NMariani  L  et al.  Twenty-year follow-up of a randomized study comparing breast-conserving surgery with radical mastectomy for early breast cancer. N Engl J Med. 2002;3471227- 1232
PubMed Link to Article
Fisher  BAnderson  SBryant  J  et al.  Twenty-year follow-up of a randomized trial comparing total mastectomy, lumpectomy, and lumpectomy plus irradiation for the treatment of invasive breast cancer. N Engl J Med. 2002;3471233- 1241
PubMed Link to Article
Fisher  BBauer  MMargolese  R  et al.  Five-year results of randomized clinical trial comparing total mastectomy and segmental mastectomy with or without radiation in the treatment of breast cancer. N Engl J Med. 1985;312665- 673
PubMed Link to Article
Veronesi  USaccozzi  RDel Vecchio  M  et al.  Camparing radical mastectomy with quadrentectomy, axillary dissection, and radiation therapy in patients with small cancers of the breast. N Engl J Med. 1981;3056- 11
PubMed Link to Article
Fisher  BCostantino  JRedmond  C  et al.  Lumpectomy compared with lumpectomy and radiation therapy for the treatment of intraductal cancer. N Engl J Med. 1993;3281581- 1586
PubMed Link to Article
Carter  CLAllen  CHenson  DE Relation of tumor size, lymph node status and survival in 24 240 breast cancer cases. Cancer. 1989;63181- 187
PubMed Link to Article
Fisher  BBauer  MWickerham  L  et al.  Relation of number of positive nodes to the prognosis of patients with primary breast cancer: an NSABP update. Cancer. 1983;521551- 1557
PubMed Link to Article
Walls  JBoggis  CRMWilson  M  et al.  Treatment of the axilla in the patients with screen-detected breast cancer. Br J Surg. 1993;80436- 438
PubMed Link to Article
Giuliano  ABarch  AMSpivack  BBeitsch  PDEvans  SW Incidence and predictors of axillary metastasis in T1 carcinoma of the breast. J Am Coll Surg. 1996;183185- 189
PubMed
Fisher  BSlack  NHAusman  RKBross  ID Location of breast carcinoma and prognosis. Surg Gynecol Obstet. 1969;129705- 716
PubMed
Swedborg  IWallgren  A The effect of pre- and postmastectomy radiotherapy on the degree of edema, shoulder joint mobility and gripping force. Cancer. 1981;47877- 881
PubMed Link to Article
Kissin  MWQuerci della Rovere  GEaston  DWestbury  G Risk of lymphoedema following the treatment of breast cancer. Br J Surg. 1986;73580- 584
PubMed Link to Article
Benson  EAThorogood  J The effect of surgical techniqe on local recurrence rates following mastectomy. Eur J Surg Oncol. 1986;12267- 271
PubMed
Delouche  GBachelot  FPremont  MKurtz  JM Conservation treatment of early breast cancer: long term results and complications. Int J Radiat Oncol Biol Phys. 1987;1329- 34
PubMed Link to Article
Gajdos  CTartter  PIBleiweiss  IJ Lymphatic invasion, tumor size, and age are independent predictors of axillary lymph node metastases in women with T1 breast cancers. Ann Surg. 1999;230692- 696
PubMed Link to Article
Rivadeneira  DESimmons  RMChristos  PJHanna  KDaly  JMOsborne  MP Predictive factors associated with axillary lymph node metastases in T1a and T1b breast carcinomas: analysis in more than 900 patients. J Am Coll Surg. 2000;1911- 6discussion6- 8
PubMed Link to Article
Giuliano  AEKirgan  DMGuenther  JMMorton  DL Lymphatic mapping and sentinel lymphadenectomy for breast cancer. Ann Surg. 1994;220391- 401
PubMed Link to Article
Harris  JRLippman  MEVeronesi  UWillet  W Breast cancer (3). N Engl J Med. 1992;327473- 480
PubMed Link to Article
Mansour  EGRavdi  PMDressler  L Prognostic factors in early breast carcinoma. Cancer. 1994;74381- 400
PubMed Link to Article
Weiser  RWMontgomery  LLTank  LK  et al.  Lymphovascular invasion enhances the prediction of nonsentinel node metastases in breast cancer patients with positive sentinel nodes. Ann Surg Oncol. 2001;8145- 149
PubMed Link to Article
Chu  KTurner  RHansen  NBrennan  MBBilchik  AGiuliano  A Do all patients with sentinel node metastasis from breast cancer need complete axillary node dissection? Ann Surg. 1999;229536- 541
PubMed Link to Article
Reynolds  CMick  RDonohue  JH  et al.  Sentinel lymph node biopsy with metastasis: can axillary dissection be avoided in some patients with breast cancer? J Clin Oncol. 1999;171720- 1726
PubMed
Abdessalam  SZervos  EPrasad  M  et al.  Predictors of positive axillary lymph nodes after sentinel lymph node biopsy in breast cancer. Am J Surg. 2001;182316- 320
PubMed Link to Article
Sachdev  UMurphy  KDerzie  AJaffer  SBleiweiss  IJBrower  S Predictors of nonsentinel lymph node metastasis in breast cancer patients. Am J Surg. 2002;183213- 217
PubMed Link to Article
Turner  RChu  KQi  K  et al.  Pathologic features associated with nonsentinel lymph node metastases in patients with metastatic breast carcinoma in a sentinel lymph node. Cancer. 2000;89574- 581
PubMed Link to Article
Ross  MI Sentinel node dissection in early-stage breast cancer: ongoing prospective randomized trials in the USA. Ann Surg Oncol. 2001;9 ((suppl)) 77S- 81S
PubMed
Grube  BJGiuliano  AE Observation of the breast cancer patient with a tumor-positive sentinel node: implications of the ACOSOG Z0011 trial. Semin Surg Oncol. 2001;20230- 237
Link to Article
Harlow  SPKrag  DN Sentinel lymph node—why study it: implications of the B-32 study. Semin Surg Oncol. 2001;20224- 229
Link to Article

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