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Complete Clinical Response After Preoperative Chemoradiation in Rectal Cancer: Is a “Wait and See” Policy Justified?

  • Original Contributions
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Diseases of the Colon & Rectum

Abstract

Purpose

A proportion of patients, who receive preoperative chemoradiation for locally advanced (T3, T4, NX) rectal cancer achieve a complete clinical response and a pathologic complete response in the region of 15 to 30 percent. Support is growing in the United Kingdom for the concept of “waiting to see” and not proceeding to radical surgery when a complete clinical response is observed. The purpose of this review was to use a literature search to assess how often complete clinical response is achieved after neoadjuvant chemoradiation, the concordance of this finding with pathologic complete response, and to determine whether it is feasible to observe patients who achieve complete clinical response rather than proceed to surgery.

Results

In total, 218 Phase I/II or retrospective studies and 28 Phase III trials of preoperative radiotherapy or chemoradiation were identified: 96 percent of trials documented the pathologic complete response, but only 38 trials presented data on the achievement of a complete clinical response/partial clinical response. Only five studies were found in which patients with clinically staged T2/T3 tumors were treated with radiotherapy/chemoradiation and did not routinely proceed to surgery and also reported on the long-term outcome of a “wait and see” policy.

Discussion

It remains uncertain whether the degree of response to chemoradiation in terms of complete clinical response or pathologic complete response is a useful clinical end point. Studies that include T3 rectal cancer are associated with high local recurrence rates after nonsurgical treatment. Few studies report long-term outcome after achievement of a complete clinical response.

Conclusions

The end point of complete clinical response is inconsistently defined and seems insufficiently robust with only partial concordance with pathologic complete response. The rationale of a “wait and see” policy when complete clinical response status is achieved relies on retrospective observations, which are currently insufficient to support this policy except in patients who are recognized to be unfit for or refuse radical surgery.

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Authors and Affiliations

  1. Centre for Cancer Treatment, Mount Vernon Hospital, Northwood, Middlesex, United Kingdom

    R. Glynne-Jones M.B.B.S., F.R.C.R.

  2. Watford General Hospital, Watford, Hertfordshire, Middlesex, United Kingdom

    M. Wallace M.S., F.R.C.S., J. I. L. Livingstone M.S., F.R.C.S. & J. Meyrick-Thomas M.A., M.B.B.S., F.R.C.S.

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  1. R. Glynne-Jones M.B.B.S., F.R.C.R.
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Correspondence to R. Glynne-Jones M.B.B.S., F.R.C.R..

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Glynne-Jones, R., Wallace, M., Livingstone, J.I.L. et al. Complete Clinical Response After Preoperative Chemoradiation in Rectal Cancer: Is a “Wait and See” Policy Justified?. Dis Colon Rectum 51, 10–20 (2008). https://doi.org/10.1007/s10350-007-9080-8

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