Correction to: Preliminary result of carbon-ion radiotherapy using the spot scanning method for prostate cancer

Correction to: Radiation Oncology (2020) 15:127 https://doi.org/10.1186/s13014-020-01575-7

Following publication of the original article [1], the authors identified minor errors that should be addressed.

In the Abstract, the original publication read (affected area marked in bold):

Grade 2 acute rectal toxicity was not observed. Grade 2 late urinary toxicity and grade 2 late rectal toxicity were observed in 17 (6.7%) and 3 patients (1.2%), respectively.

The corrected sentence reads:

Grade 2 acute rectal toxicity was not observed. Grade 2 late urinary toxicity and grade 2 late rectal toxicity were observed in 16 (6.3%) and 3 patients (1.2%), respectively.

In Table 1, Row 1, the Follow-up duration, months, median (range) originally read 24.3 (4.1–39.5). The corrected reading is 35.3 (4.1–52.9).

The corrected Table 1 is given here.

Table 1 Patient characteristics (n = 253)

In Results, Toxicities, the original publication read (affected area marked in bold):

Grades 1 and 2 urinary frequency were observed in 36 (14.8%) and 12 (4.7%) patients, respectively.

The corrected sentence reads:

Grades 1 and 2 urinary frequency were observed in 34 (13.4%) and 9 (3.6%) patients, respectively.

In Results, Toxicities, the original publication read (affected areas marked in bold):

The late GU toxicity grades were one in 52 patients (20.6%) and two in 17 patients (6.7%). Grade 3 or greater late GU toxicity was not observed. Among the late GU toxicities, grades 1 and 2 hematuria were observed in 14 (5.5%) and one patient (0.4%), respectively. Grades 1 and 2 urinary frequency were observed in 28 (11.1%) and 11 (4.3%) patients, respectively, and grades 1 and 2 urinary stricture were observed in 5 (2.0%) and 3 (1.2%) patients, respectively.

The corrected sentences read:

The late GU toxicity grades were one in 52 patients (20.6%) and two in 16 patients (6.3%). Grade 3 or greater late GU toxicity was not observed. Among the late GU toxicities, grades 1 and 2 hematuria were observed in 14 (5.5%) and one patient (0.4%), respectively. Grades 1 and 2 urinary frequency were observed in 26 (10.3%) and 11 (4.3%) patients, respectively, and grades 1 and 2 urinary stricture were observed in 5 (2.0%) and 3 (1.2%) patients, respectively.

In the Discussion, an incorrect reference number was used; [37] has been replaced by the correct [36] in the following sentence:

"More than 80% of late toxicities occurred within 2 years after CIRT [36];..."

The correction does not have any effect on the final conclusions of the paper. The original article has been corrected.