Annals of Coloproctology

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Reconsideration of the Safety of Laparoscopic Rectal Surgery for Cancer: Gyung Mo Son, Bong-Hyeon Kye, Min Ki Kim, Jun-Gi Kim; Ann Coloproctol. 2019;35(5):229-237. Published online October 31, 2019; DOI: https://doi.org/10.3393/ac.2019.10.16

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The oncological outcomes of laparoscopic rectal cancer surgery were evaluated in recent multicenter randomized clinical trials (RCTs). The MRC-CLASSIC, COLOR II, and COREAN trials found no differences in local recurrence or diseasefree survival rate between laparoscopic and open surgery. However, the noninferiority of laparoscopic surgery with respect to open surgery for rectal cancer was not established on statistical analysis in the ACOSOG Z6051 and the ALaCaRT trials. Quality of total mesorectal excision (TME) is one of the most important prognostic factors. Incomplete TME had unfavorable oncologic outcomes compared to complete TME. Although TME quality can be clearly identified on pathologic evaluation, there is controversy regarding the acceptable range of oncologically safe TME for laparoscopic surgery. It is not certain whether near-complete TME has an unfavorable oncologic impact and whether laparoscopic surgery with near-complete TME is an oncological threat. Therefore, the surgical community will be interested in the long-term outcomes and meta-analyses of ongoing large-scale RCTs. Laparoscopic rectal cancer surgery has been steadily improving its safety for oncology surgery, which has been reported consistently in various multicenter RCTs. To improve surgical quality, colorectal surgeons should choose the most appropriate surgical technique, including laparoscopic surgery.

Citations

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Original Article

Effects of Delay in the Snap Freezing of Colorectal Cancer Tissues on the Quality of DNA and RNA: Sang Hyun Hong, Hyun Ah Baek, Kyu Yun Jang, Myoung Ja Chung, Woo Sung Moon, Myoung Jae Kang, Dong Geun Lee, Ho Sung Park; J Korean Soc Coloproctol. 2010;26(5):316-323. Published online October 31, 2010; DOI: https://doi.org/10.3393/jksc.2010.26.5.316

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Abstract PDF

Purpose

The success of basic molecular research using biospecimens strongly depends on the quality of the specimen. In this study, we evaluated the effects of delayed freezing time on the stability of DNA and RNA in fresh frozen tissue from patients with colorectal cancer.

Methods

Tissues were frozen at 10, 30, 60, and 90 minutes after extirpation of colorectal cancer in 20 cases. Absorbance ratio of 260 to 280 nm (A₂₆₀/A₂₈₀) and agarose gel electrophoresis were evaluated. In addition, the RNA integrity number (RIN) was assayed for the analysis of the RNA integrity.

Results

Regardless of delayed freezing time, all DNA and RNA samples revealed A₂₆₀/A₂₈₀ ratios of more than 1.9, and all DNA samples showed a discrete, high-molecular-weight band on agarose gel electrophoresis. The RINs were 7.53 ± 2.04, 6.70 ± 1.88, 6.47 ± 2.58, and 4.22 ± 2.34 at 10, 30, 60, and 90 minutes, respectively. Though the concentration of RNA was not affected by delayed freezing, the RNA integrity was decreased with increasing delayed freezing time.

Conclusion

According to the RIN results, we recommend that the collection of colorectal cancer tissue should be done within 10 minutes for studies requiring RNA of high quality and within 30 minutes for usual RNA studies.

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